Publications
| Title | Abstract | Year(sorted descending) Filter | PMID Filter |
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| genetic origin and dispersal of the invasive soybean aphid inferred from population genetic analysis and approximate bayesian computation. | biological invasion is considered one of the most important global environmental problems. knowledge of the source and dispersal routes of invasion could facilitate the eradication and control of invasive species. soybean aphid, aphis glycines matsumura, is one of the most destructive soybean pests. for effective management of this pest, we conducted genetic analyses and approximate bayesian computation (abc) analysis to determine the origins and dispersal of the aphid species, as well as the so ... | 2018 | 29316260 |
| spatial patterns and sequential sampling plans for predators of aphis glycines (hemiptera: aphididae) in minnesota soybean. | the soybean aphid, aphis glycines matsumura, is an economically important soybean pest. many studies have demonstrated that predatory insects are important in suppressing a. glycines population growth. however, to improve the utilization of predators in a. glycines management, sampling plans need to be developed and validated for predators. aphid predators were sampled in soybean fields near rosemount, minnesota, from 2006-2007 and 2013-2015 with sample sizes of 20-80 plants. sampling plans were ... | 2017 | 28334264 |
| interactions of effects of host plant resistance and seed treatments on soybean aphid (aphis glycines matsumura) and soybean cyst nematode (heterodera glycines ichinohe). | the soybean cyst nematode, heterodera glycines, and soybean aphid, aphis glycines, are invasive, widespread and economically important pests of soybean, glycine max, in north america. management of these pests relies primarily on use of pesticides and soybean germplasm with genetic resistance. a 3-year field study and complementary greenhouse experiment were conducted to determine the benefits of host plant resistance (hpr) and pesticidal seed treatments for managing pest populations and preserv ... | 2017 | 29160037 |
| determining the effectiveness of three-gene pyramids against aphis glycines (hemiptera: aphididae) biotypes. | since the discovery of aphis glycines matsumura (hemiptera: aphididae) in the united states, the primary management tactic has been foliar insecticides. alternative management options such as host plant resistance to a. glycines have been developed and their effectiveness proved. however, the use of host plant resistance was complicated by the discovery of multiple, virulent biotypes of a. glycines in the united states that are capable of overcoming single rag genes, rag1 and rag2, as well as a ... | 2017 | 29220517 |
| variable isotopic compositions of host plant populations preclude assessment of aphid overwintering sites. | soybean aphid (aphis glycines matsumura) is a pest of soybean in the northern midwest whose migratory patterns have been difficult to quantify. improved knowledge of soybean aphid overwintering sites could facilitate the development of control efforts with exponential impacts on aphid densities on a regional scale. in this preliminary study, we explored the utility of variation in stable isotopes of carbon and nitrogen to distinguish soybean aphid overwintering origins. we compared variation in ... | 2017 | 29206134 |
| from pest data to abundance-based risk maps combining eco-physiological knowledge, weather, and habitat variability. | noxious species, i.e., crop pest or invasive alien species, are major threats to both natural and managed ecosystems. invasive pests are of special importance, and knowledge about their distribution and abundance is fundamental to minimize economic losses and prioritize management activities. occurrence models are a common tool used to identify suitable zones and map priority areas (i.e., risk maps) for noxious species management, although they provide a simplified description of species dynamic ... | 2017 | 27859850 |
| evidence for soybean aphid (hemiptera: aphididae) resistance to pyrethroid insecticides in the upper midwestern united states. | soybean aphid, aphis glycines matsumura (hemiptera: aphididae), is a damaging invasive pest of soybean in the upper midwest. threshold-based insecticide applications are the primary control method for soybean aphid, but few insecticide groups are available (i.e., pyrethroids, organophosphates, and neonicotinoids). to quantify current levels of soybean aphid susceptibility to pyrethroids in the upper midwest and monitor for insecticide resistance, leaf-dip bioassays were performed with λ-cyhaloth ... | 2017 | 28961778 |
| acute-contact and chronic-systemic in vivo bioassays: regional monitoring of susceptibility to thiamethoxam in soybean aphid (hemiptera: aphididae) populations from the north central united states. | the risks associated with soybean aphid, aphis glycines matsumura (hemiptera: aphididae), in the north central soybean systems has fostered the adoption of prophylactic chemical control practices, such as planting seeds treated with neonicotinoid insecticides, especially thiamethoxam. consequently, there is a concern that increased selection pressure imposed on the arthropod-pest complex by this insecticide may lead to resistance. therefore, in vivo bioassays were conducted to determine the susc ... | 2017 | 29186445 |
| assessing the value and pest management window provided by neonicotinoid seed treatments for management of soybean aphid (aphis glycines matsumura) in the upper midwestern united states. | a 2-year, multi-state study was conducted to assess the benefits of using soybean seed treated with the neonicotinoid thiamethoxam to manage soybean aphid in the upper midwestern usa and compare this approach with an integrated pest management (ipm) approach that included monitoring soybean aphids and treating with foliar-applied insecticide only when the economic threshold was reached. concentrations of thiamethoxam in soybean foliage were also quantified throughout the growing season to estima ... | 2017 | 28459234 |
| efficacy of rna interference knockdown using aerosolized short interfering rnas bound to nanoparticles in three diverse aphid species. | rna interference (rnai) has emerged as a promising method for validating gene function; however, its utility in nonmodel insects has proven problematic, with delivery methods being one of the main obstacles. this study investigates a novel method of rnai delivery in aphids, the aerosolization of short interfering rna (sirna)-nanoparticle complexes. by using nanoparticles as a sirna carrier, the likelihood of cellular uptake is increased, when compared to methods previously used in insects. to de ... | 2017 | 28314050 |
| sublethal and hormesis effects of beta-cypermethrin on the biology, life table parameters and reproductive potential of soybean aphid aphis glycines. | beta-cypermethrin has long been recommended as an effective pesticide to control the soybean aphid, aphis glycines matsumura, a serious pest in soybean crops. besides acute toxicity, it leads to changes in life history traits of a. glycines, notably its reproductive potential. this study has assessed the effects of five sublethal concentrations (0.625, 1.25, 2.5, 5 and 10 µg/l) of beta-cypermethrin on different life history traits of a. glycines. exposure to these concentrations caused shorter o ... | 2017 | 28685415 |
| characterization of insect resistance loci in the usda soybean germplasm collection using genome-wide association studies. | management of insects that cause economic damage to yields of soybean mainly rely on insecticide applications. sources of resistance in soybean plant introductions (pis) to different insect pests have been reported, and some of these sources, like for the soybean aphid (sba), have been used to develop resistant soybean cultivars. with the availability of soysnp50k and the statistical power of genome-wide association studies, we integrated phenotypic data for beet armyworm, mexican bean beetle (m ... | 2017 | 28555141 |
| thiamethoxam toxicity and effects on consumption behavior in orius insidiosus (hemiptera: anthocoridae) on soybean. | neonicotinoid residues can be present in soybean vegetative tissue, prey insects, and flower tissues, possibly making them toxic to pollinators and natural enemies. baseline information on the toxicity of neonicotinoids to beneficial insects other than pollinators through multiple routes of insecticide exposure is limited. the objectives of this study were 1) to evaluate the toxicity of thiamethoxam to the hemipteran predator, orius insidiosus say, exposed to residues through treated vegetative ... | 2017 | 28369319 |
| warming impact on herbivore population composition affects top-down control by predators. | understanding warming impact on herbivores facilitates predicting plant/crop dynamics in natural/agricultural systems. however, it remains unclear how warming will affect herbivore population size and population composition, consequently altering herbivore colonization in a tri-trophic system (plant-herbivore-predator or crop-pest-biocontrol agent). we studied a soybean-aphid-lady beetle system, by conducting (1) a laboratory warming experiment to examine warming impact (+2 °c or +4 °c) on the a ... | 2017 | 28424477 |
| survival and feeding rates of four aphid species (hemiptera: aphididae) on various sucrose concentrations in diets. | different concentrations of sucrose were used to investigate how survival and feeding was affected in four species of aphids (hemiptera: aphididae). seven sucrose concentrations were evaluated in feeding chambers fitted with parafilm membranes and infested with nymphs of aphis glycines matsumura, diuraphis noxia kurdjumov, myzus persicae sulzer, or schizaphis graminum rondani at 25 °c and a photoperiod of 14:10 (l:d) h. survival on each diet was recorded 1, 3, 5, 7, 9, and 11 d. diet volumes (μl ... | 2017 | 28637212 |
| nostoc calcicola extract improved the antioxidative response of soybean to cowpea aphid. | soybean (glycine max (l.) merr. cv. "nam dan") is one of the most valuable crops in agricultural production in nghe an province (vietnam). our previous study revealed that extract of the cyanobacterium strain nostoc calcicola hn9 expressed positive effect on growth and development, and raised soybean productivity (tran et al. in proceeding of vietnam national conference of research on biology, da nang, 2016). we hypothesized that n. calcicola hn9 would improve the defense responses of g. max cv. ... | 2017 | 29185129 |
| host adaptation of soybean dwarf virus following serial passages on pea (pisum sativum) and soybean (glycine max). | soybean dwarf virus (sbdv) is an important plant pathogen, causing economic losses in soybean. in north america, indigenous strains of sbdv mainly infect clover, with occasional outbreaks in soybean. to evaluate the risk of a us clover strain of sbdv adapting to other plant hosts, the clover isolate sbdv-md6 was serially transmitted to pea and soybean by aphid vectors. sequence analysis of sbdv-md6 from pea and soybean passages identified 11 non-synonymous mutations in soybean, and six mutations ... | 2017 | 28635666 |
| effects of foliar insecticides on leaf-level spectral reflectance of soybean. | pest-induced changes in plant reflectance are crucial for the development of pest management programs using remote sensing. however, it is unknown if plant reflectance data is also affected by foliar insecticides applied for pest management. our study assessed the effects of foliar insecticides on leaf reflectance of soybean. a 2-yr field trial and a greenhouse trial were conducted using randomized complete block and completely randomized designs, respectively. treatments consisted of an untreat ... | 2017 | 29029168 |
| economic injury levels for aphis glycines matsumura (hemiptera: aphididae) on the soybean aphid tolerant ks4202 soybean. | the soybean aphid, aphis glycines matsumura (hemiptera: aphididae), is an invasive species from asia that has been the major economic insect pest of soybeans, glycine max (l.) merrill, since 2000. while use of soybeans expressing antibiosis and antixenosis is a well-studied strategy to manage this pest, aphid-tolerant soybeans remain underexplored. this study examined the relationship between cumulative aphid-days (cad) and yield loss in the tolerant soybean ks4202 during two growing seasons to ... | 2017 | 28961855 |
| soybean aphid, aphis glycines (hemiptera: aphididae), developmental and reproductive capacity on white clover, trifolium repens (rosales: leguminosae), in northeast china. | nymphs of aphis glycines matsumura were individually reared to adults in the laboratory on detached leaf discs of trifolium repens l. (white clover) mounted on agar medium. adults of a. glycines were fed t. repens within small clip cages in the field. development, reproduction and intrinsic rates of increase of a. glycines were studied. these data were compared to those of controls fed known host plants including cultivated soybean glycine max (l.) merr. and the wild soybean species glycine soja ... | 2017 | 28798493 |
| fine mapping of the soybean aphid-resistance genes rag6 and rag3c from glycine soja 85-32. | rag6 and rag3c were delimited to a 49-kb interval on chromosome 8 and a 150-kb interval on chromosome 16, respectively. structural variants in the exons of candidate genes were identified. the soybean aphid, an invasive species, has significantly threatened soybean production in north america since 2000. host-plant resistance is known as an ideal management strategy for aphids. two novel aphid-resistance loci, rag6 and rag3c, from glycine soja 85-32, were previously detected in a 10.5-cm interva ... | 2017 | 28887657 |
| establishment of in vitro soybean aphids, aphis glycines (hemiptera: aphididae): a tool to facilitate studies of aphid symbionts, plant-insect interactions and insecticide efficacy. | studies on plant-insect interactions of the soybean aphid, aphis glycines (matsumura), can be influenced by environmental fluctuations, status of the host plant and variability in microbial populations. maintenance of aphids on in vitro-grown plants minimizes environmental fluctuations, provides uniform host materials and permits the selective elimination of aphid-associated microbes for more standardized controls in aphid research. | 2017 | 27680689 |
| transcriptomic dynamics in soybean near-isogenic lines differing in alleles for an aphid resistance gene, following infestation by soybean aphid biotype 2. | genetic resistance of soybean [glycine max (l.) merr] against aphis glycines provides effective management of this invasive pest, though the underlying molecular mechanisms are largely unknown. this study aimed to investigate genome-wide changes in gene expressions of soybean near-isogenic lines (nils) either with the rag5 allele for resistance or the rag5 allele for susceptibility to the aphid following infestation with soybean aphid biotype 2. | 2017 | 28645245 |
| mapping novel aphid resistance qtl from wild soybean, glycine soja 85-32. | two novel qtls conferring aphid resistance were mapped and validated on soybean chromosomes 8 and 16, respectively. closely linked markers were developed to assist breeding for aphid resistance. soybean aphid, aphis glycines matsumura, is a highly destructive pest for soybean production. e08934, a soybean advanced breeding line derived from the wild soybean glycine soja 85-32, has shown strong resistance to aphids. to dissect the genetic basis of aphid resistance in e08934, a mapping population ... | 2017 | 28710504 |
| validation of a hairy roots system to study soybean-soybean aphid interactions. | the soybean aphid (aphis glycines) is one of the main insect pests of soybean (glycine max) worldwide. genomics approaches have provided important data on transcriptome changes, both in the insect and in the plant, in response to the plant-aphid interaction. however, the difficulties to transform soybean and to rear soybean aphid on artificial media have hindered our ability to systematically test the function of genes identified by those analyses as mediators of plant resistance to the insect. ... | 2017 | 28358854 |
| value of neonicotinoid seed treatments to us soybean farmers. | the benefits of neonicotinoid seed treatment to soybean farmers have received increased scrutiny. rather than use data from small-plot experiments, this research uses survey data from 500 us farmers to estimate the benefit of neonicotinoid seed treatments to them. as seed treatment users, farmers are familiar with their benefits in the field and have economic incentives to only use them if they provide value. | 2017 | 27577180 |
| characterization and genetics of multiple soybean aphid biotype resistance in five soybean plant introductions. | five soybean plant introductions expressed antibiosis resistance to multiple soybean aphid biotypes. two introductions had resistance genes located in the rag1, rag2, and rag3 regions; one introduction had resistance genes located in the rag1, rag2, and rag4 regions; one introduction had resistance genes located in the rag1 and rag2 regions; and one introduction had a resistance gene located in the rag2 region. soybean aphid (aphis glycines matsumura) is the most important soybean [glycine max ( ... | 2017 | 28378054 |
| whole genome sequence of the soybean aphid, aphis glycines. | aphids are emerging as model organisms for both basic and applied research. of the 5,000 estimated species, only three aphids have published whole genome sequences: the pea aphid acyrthosiphon pisum, the russian wheat aphid, diuraphis noxia, and the green peach aphid, myzus persicae. we present the whole genome sequence of a fourth aphid, the soybean aphid (aphis glycines), which is an extreme specialist and an important invasive pest of soybean (glycine max). the availability of genomic resourc ... | 2017 | 28119199 |
| evaluation of aphis glycines as an alternative host for supporting aphelinus albipodus against myzus persicae on capsicum annuum cv. ox horn and hejiao 13. | bank plant systems provide effective biological control for pests infesting commercially important crops. aphids cause physical damage to crops by feeding on the leaves, as well as transmitting damaging viral diseases. to develop a bank plant system to control aphids that damage vegetable crops, we initially reared the parasitoid aphelinus albipodus (hayat and fatima) on the soybean aphid, aphis glycines (matsumura) reared on the soybean plant, glycine max (l.) that was elected as the alternate ... | 2017 | 27817154 |
| the effect of temperature and host plant resistance on population growth of the soybean aphid biotype 1 (hemiptera: aphididae). | a laboratory experiment was conducted to evaluate direct and indirect effects of temperature on demographic traits and population growth of biotype 1 of the soybean aphid, aphis glycines matsumura. our objectives were to better understand how temperature influences the expression of host plant resistance, quantify the individual and interactive effects of plant resistance and temperature on soybean aphid population growth, and generate thermal constants for predicting temperature-dependent devel ... | 2017 | 28025225 |
| overexpression of nictaba-like lectin genes from glycine max confers tolerance toward pseudomonas syringae infection, aphid infestation and salt stress in transgenic arabidopsis plants. | plants have evolved a sophisticated immune system that allows them to recognize invading pathogens by specialized receptors. carbohydrate-binding proteins or lectins are part of this immune system and especially the lectins that reside in the nucleocytoplasmic compartment are known to be implicated in biotic and abiotic stress responses. the class of nictaba-like lectins (nll) groups all proteins with homology to the tobacco (nicotiana tabacum) lectin, known as a stress-inducible lectin. here we ... | 2016 | 27826309 |
| evidence for compensatory photosynthetic and yield response of soybeans to aphid herbivory. | the soybean aphid,aphis glycinesmatsumura, an exotic species in north america that has been detected in 21 u.s. states and canada, is a major pest for soybean that can reduce maximum photosynthetic capacity and yields. our existing knowledge is based on relatively few studies that do not span a wide variety of environmental conditions, and often focus on relatively high and damaging population pressure. we examined the effects of varied populations and duration of soybean aphids on soybean photo ... | 2016 | 27076674 |
| genome-wide identification of calcium-dependent protein kinases in soybean and analyses of their transcriptional responses to insect herbivory and drought stress. | calcium-dependent protein kinases (cdpks) are plant-specific calcium sensors that play important roles in various aspects of plant physiology. here, we investigated phylogenic relationships, chromosomal locations, gene structures, and tissue-specific, herbivory- and drought-induced expression profiles of soybean (glycine max) gmcdpks. fifty gmcdpk genes were identified, which phylogenetically grouped into 4 distinct clusters and distributed across 13 sub-clusters. individual classes of gmcdpks h ... | 2016 | 26733237 |
| potential for sulfoxaflor to improve conservation biological control of aphis glycines (hemiptera: aphididae) in soybean. | soybean aphid, aphis glycines matsumura, is one of the most important insect pests of soybean in the north central united states. management of a. glycines currently relies on applications of broad-spectrum insecticides. however, broad-spectrum insecticides can negatively impact the natural enemies associated with aphids. selective insecticides, on the other hand, are promising control tactics for reducing the negative impact of insecticide applications. here, we compared the effects of sulfoxaf ... | 2016 | 27535848 |
| beyond focal pests: impact of a neonicotinoid seed treatment and resistant soybean lines on a non-target arthropod. | integrated pest management (ipm) tactics may effectively control focal pests, but it is also important to test the compatibility of different tactics, and consider non-target organisms. we investigated the effects of a neonicotinoid seed treatment and rag resistance genes used for soybean aphid (aphis glycines matsumura) control on reproduction of a non-target herbivore (twospotted spider mite, tetranychus urticae koch) in short-term greenhouse experiments. we also examined interactions between ... | 2016 | 27845714 |
| differential reactions of soybean isolines with combinations of aphid resistance genes rag1, rag2, and rag3 to four soybean aphid biotypes. | with the discovery of the soybean aphid (aphis glycinesmatsumura) as a devastating insect pest of soybean (glycine max(l.) merr.) in the united states, host resistance was recognized as an important management option. however, the identification of soybean aphid isolates exhibiting strong virulence against aphid resistance genes (raggenes) has highlighted the need for pyramiding genes to help ensure the durability of host resistance as a control strategy. in this study, soybean isolines with all ... | 2016 | 27018437 |
| aphis glycines virus 2, a novel insect virus with a unique genome structure. | the invasive soybean aphid, aphis glycines, is a major pest in soybeans, resulting in substantial economic loss. we analyzed the a. glycines transcriptome to identify sequences derived from viruses of a. glycines. we identified sequences derived from a novel virus named aphis glycines virus 2 (apglv2). the assembled virus genome sequence was confirmed by reverse transcription polymerase chain reaction (rt-pcr) and sanger sequencing, conserved domains were characterized, and distribution, and tra ... | 2016 | 27869772 |
| water stress modulates soybean aphid performance, feeding behavior, and virus transmission in soybean. | little is known about how water stress including drought and flooding modifies the ability of plants to resist simultaneous attack by insect feeding and transmission of insect-vectored pathogen. we analyzed insect population growth, feeding behaviors, virus transmission, and plant amino acid profiles and defense gene expression to characterize mechanisms underlying the interaction between water stress, soybean aphid and aphid-transmitted, soybean mosaic virus, on soybean plants. population growt ... | 2016 | 27200027 |
| explicit modeling of abiotic and landscape factors reveals precipitation and forests associated with aphid abundance. | increases in natural or noncrop habitat surrounding agricultural fields have been shown to be correlated with declines in insect crop pests. however, these patterns are highly variable across studies suggesting other important factors, such as abiotic drivers, which are rarely included in landscape models, may also contribute to variability in insect population abundance. the objective of this study was to explicitly account for the contribution of temperature and precipitation, in addition to l ... | 2016 | 27875008 |
| stress-induced changes in abundance differ among obligate and facultative endosymbionts of the soybean aphid. | bacterial endosymbionts can drive evolutionary novelty by conferring adaptive benefits under adverse environmental conditions. among aphid species there is growing evidence that symbionts influence tolerance to various forms of stress. however, the extent to which stress inflicted on the aphid host has cascading effects on symbiont community dynamics remains poorly understood. here we simultaneously quantified the effect of host-plant induced and xenobiotic stress on soybean aphid (aphis glycine ... | 2016 | 26865969 |
| comparative proteomic analysis in aphis glycines mutsumura under lambda-cyhalothrin insecticide stress. | lambda-cyhalothrin is now widely used in china to control the soybean aphid aphis glycines. to dissect the resistance mechanism, a laboratory-selected resistant soybean aphid strain (crr) was established with a 43.42-fold resistance ratio to λ-cyhalothrin than the susceptible strain (css) in adult aphids. in this study, a comparative proteomic analysis between the crr and css strains revealed important differences between the susceptible and resistant strains of soybean aphids for λ-cyhalothrin. ... | 2016 | 27395796 |
| population dynamics of the soybean aphid (hemiptera: aphididae) in quebec (canada). | the population dynamics of the soybean aphid (aphis glycinesmatsumura) was studied over a 12-yr period (2004-2015) from archive and field data collected in the montérégie area of quebec (canada). as observed in the united states, a 2-yr oscillation cycle was observed from 2005 to 2011 in quebec, with high infestations during odd years, while the opposite was found in 2014 and 2015. a broader pattern could also be observed, with high infestation in two consecutive years every 10 yr. in addition, ... | 2016 | 27016599 |
| feeding behavior of soybean aphid (hemiptera: aphididae) biotype 2 on resistant and susceptible soybean. | host plant resistance to the soybean aphid, aphis glycines matsumura, is an effective means of controlling populations of this introduced pest species in the united states. rag (resistance to aphis glycines) genes identified in soybean germplasm have been incorporated into commercial cultivars, but differential responses by soybean aphid biotypes to the rag genes have made understanding mechanisms underlying resistance associated with rag genes increasingly important. we compared the behavior of ... | 2016 | 26578627 |
| the effect of an interspersed refuge on aphis glycines (hemiptera: aphididae), their natural enemies, and biological control. | soybean production in the north central united states has relied heavily on the use of foliar and seed applied insecticides to manage aphis glycines (hemiptera: aphididae). an additional management strategy is the use soybean cultivars containing a. glycines resistance genes (rag). previous research has demonstrated that rag cultivars are capable of preventing yield loss equivalent to the use of foliar and seed-applied insecticides.however, the presence of virulent biotypes in north america has ... | 2016 | 26476557 |
| lady beetle (coleoptera: coccinellidae) communities in soybean and maize. | coccinellids provide the most effective natural control of soybean aphid, but outbreaks remain common. previous work suggests that native coccinellids are rare in soybean, potentially limiting soybean aphid control. we compared the coccinellid community in soybean with that of maize to identify differences in how coccinellid species use these habitats. as maize has long been used by coccinellids in the americas, we hypothesized that coccinellids native to the americas would use maize habitats, w ... | 2016 | 26396229 |
| uptake and translocation of imidacloprid, clothianidin and flupyradifurone in seed-treated soybeans. | seed treatment insecticides have become a popular management option for early-season insect control. this study investigated the total uptake and translocation of seed-applied [(14) c]imidacloprid, [(14) c]clothianidin and [(14) c]flupyradifurone into different plant parts in three soybean vegetative stages (vc, v1 and v2). the effects of soil moisture stress on insecticide uptake and translocation were also assessed among treatments. we hypothesized that (1) uptake and translocation would be di ... | 2016 | 26373258 |
| trophic cascades in agricultural landscapes: indirect effects of landscape composition on crop yield. | the strength and prevalence of trophic cascades, defined as positive, indirect effects of natural enemies (predatory and parasitic arthropods) on plants, is highly variable in agroecosystems. this variation may in part be due to the spatial or landscape context in which hese trophic cascades occur. in 2011 and 2012, we conducted a natural enemy exclusion experiment in soybean fields along a gradient of landscape composition across southern wisconsin and michigan, usa. we used structural equation ... | 2015 | 26214911 |
| an induced susceptibility response in soybean promotes avirulent aphis glycines (hemiptera: aphididae) populations on resistant soybean. | observations of virulent aphis glycines matsumura populations on resistant soybean in north america occurred prior to the commercial release of rag genes. laboratory assays confirmed the presence of four a. glycines biotypes in north america defined by their virulence to the rag1 and rag2 genes. avirulent and virulent biotypes can co-occur and potentially interact on soybean, which may result in induced susceptibility. we conducted a series of experiments to determine if the survival of avirulen ... | 2015 | 26313972 |
| soybean aphid intrabiotype variability based on colonization of specific soybean genotypes. | the soybean aphid, aphis glycines matsumura (hemiptera: aphididae), is one of the most destructive insect pests on soybeans in the united states. one method for managing this pest is through host plant resistance. since its arrival in 2000, 4 aphid biotypes have been identified that are able to overcome soybean aphid resistance (rag) genes. a soybean aphid isolate collected from moline, illinois readily colonized soybean plants with the soybean aphid resistance gene rag2, unlike biotypes 1 and 2 ... | 2015 | 25183413 |
| design, synthesis and aphicidal activity of n-terminal modified insect kinin analogs. | the insect kinins are a class of multifunctional insect neuropeptides present in a diverse variety of insects. insect kinin analogs showed multiple bioactivities, especially, the aphicidal activity. to find a biostable and bioactive insecticide candidate with simplified structure, a series of n-terminal modified insect kinin analogs was designed and synthesized based on the lead compound [aib]-phe-phe-[aib]-trp-gly-nh2. their aphicidal activity against the soybean aphid aphis glycines was evalua ... | 2015 | 25116632 |
| investigation of the chemical interface in the soybean-aphid and rice-bacteria interactions using maldi-mass spectrometry imaging. | mass spectrometry imaging (msi) is an emerging technology for high-resolution plant biology. it has been utilized to study plant-pest interactions, but limited to the surface interfaces. here we expand the technology to explore the chemical interactions occurring inside the plant tissues. two sample preparation methods, imprinting and fracturing, were developed and applied, for the first time, to visualize internal metabolites of leaves in matrix-assisted laser desorption ionization (maldi)-msi. ... | 2015 | 25914940 |
| potential overwintering locations of soybean aphid (hemiptera: aphididae) colonizing soybean in ohio and wisconsin. | soybean aphids, aphis glycines matsumura, depend on long-distance, wind-aided dispersal to complete their life cycle. despite our general understanding of soybean aphid biology, little is explicitly known about dispersal of soybean aphids between winter and summer hosts in north america. this study compared genotypic diversity of soybean aphids sampled from several overwintering locations in the midwest and soybean fields in ohio and wisconsin to test the hypothesis that these overwintering loca ... | 2015 | 26313174 |
| the endosymbiont arsenophonus provides a general benefit to soybean aphid (hemiptera: aphididae) regardless of host plant resistance (rag). | soybean aphid, aphis glycines matsumura (hemiptera: aphididae), invokes substantial chemical treatment and economic cost in north america. resistant soybean genotypes hold promise as a low-impact control methodology, but soybean aphid "biotypes" capable of development on resistant soy cast doubt on the durability of soy resistance. we hypothesized that variation in soybean aphid ability to colonize resistant soy is partially attributable to a bacterial symbiont of soybean aphid, arsenophonus. we ... | 2015 | 26313962 |
| reduced fitness of virulent aphis glycines (hemiptera: aphididae) biotypes may influence the longevity of resistance genes in soybean. | sustainable use of insect resistance in crops require insect resistance management plans that may include a refuge to limit the spread of virulence to this resistance. however, without a loss of fitness associated with virulence, a refuge may not prevent virulence from becoming fixed within a population of parthenogenetically reproducing insects like aphids. aphid-resistance in soybeans (i.e., rag genes) prevent outbreaks of soybean aphid (aphis glycines), yet four biotypes defined by their capa ... | 2015 | 26372106 |
| eco-friendly insecticide discovery via peptidomimetics: design, synthesis, and aphicidal activity of novel insect kinin analogues. | insect kinin neuropeptides are pleiotropic peptides that are involved in the regulation of hindgut contraction, diuresis, and digestive enzyme release. they share a common c-terminal pentapeptide sequence of phe(1)-xaa(2)-yaa(3)-trp(4)-gly(5)-nh2 (where xaa(2) = his, asn, phe, ser, or tyr; yaa(3) = pro, ser, or ala). recently, the aphicidal activity of insect kinin analogues has attracted the attention of researchers. our previous work demonstrated that the sequence-simplified insect kinin penta ... | 2015 | 25912216 |
| recommended reference genes for quantitative pcr analysis in soybean have variable stabilities during diverse biotic stresses. | for real-time reverse transcription-pcr (qrt-pcr) in soybean, reference genes in different tissues, developmental stages, various cultivars, and under stress conditions have been suggested but their usefulness for research on soybean under various biotic stresses occurring in north-central u.s. is not known. here, we investigated the expression stabilities of ten previously recommended reference genes (abct, cyp, ef1a, fbox, gpdh, rpl30, tua4, tub4, tua5, and unk2) in soybean under biotic stress ... | 2015 | 26244340 |
| sublethal and hormesis effects of imidacloprid on the soybean aphid aphis glycines. | the soybean aphid, aphis glycines matsumura, is a major pest in soybean crop. current management of this pest relies mainly on insecticides applications, and the neonicotinoid imidacloprid has been proposed as an effective insecticide to control a. glycines in soybean field. imidacloprid at lethal concentrations not only exerts acute toxicity to a. glycines, but also cause various biological changes when aphids are chronically exposed to lower concentrations. in this study, we assessed the effec ... | 2015 | 25492586 |
| identification of soybean proteins and genes differentially regulated in near isogenic lines differing in resistance to aphid infestation. | soybean aphid is an important pest causing significant yield losses. the rag2 locus confers resistance to soybean aphid biotypes 1 and 2. transcriptomic and proteomic analyses were done over a 48 h period after aphid infestation using near isogenic lines (nils) differing at the rag2 locus. comparing the rag2 and/or rag2 lines identified 3445 proteins, of which 396 were differentially regulated between the two lines, including proteins involved in cell wall metabolism, carbohydrate metabolism, an ... | 2015 | 26350764 |
| elevated expression of esterase and cytochrome p450 are related with lambda-cyhalothrin resistance and lead to cross resistance in aphis glycines matsumura. | a resistant strain of the aphis glycines matsumura (crr) has developed 76.67-fold resistance to lambda-cyhalothrin compared with the susceptible (css) strain. synergists piperonyl butoxide (pbo), s,s,s-tributyltrithiophosphate (def) and triphenyl phosphate (tpp) dramatically increased the toxicity of lambda-cyhalothrin to the resistant strain. bioassay results indicated that the crr strain had developed high levels of cross-resistance to chlorpyrifos (11.66-fold), acephate (8.20-fold), cypermeth ... | 2015 | 25752434 |
| shifts in buchnera aphidicola density in soybean aphids (aphis glycines) feeding on virus-infected soybean. | vertically transmitted bacterial symbionts are common in arthropods. aphids undergo an obligate symbiosis with buchnera aphidicola, which provides essential amino acids to its host and contributes directly to nymph growth and reproduction. we previously found that newly adult aphis glycines feeding on soybean infected with the beetle-transmitted bean pod mottle virus (bpmv) had significantly reduced fecundity. we hypothesized that the reduced fecundity was attributable to detrimental impacts of ... | 2015 | 25845267 |
| shifts in dynamic regime of an invasive lady beetle are linked to the invasion and insecticidal management of its prey. | the spread and impact of invasive species may vary over time in relation to changes in the species itself, the biological community of which it is part, or external controls on the system. we investigate whether there have been changes in dynamic regimes over the last 20 years of two invasive species in the midwestern united states, the multicolored asian lady beetle harmonia axyridis and the soybean aphid aphis glycines. we show by model selection that after its 1993 invasion into the american ... | 2015 | 26591447 |
| whole genome sequence of the soybean aphid endosymbiont buchnera aphidicola and genetic differentiation among biotype-specific strains. | endosymbiosis with microorganisms is common in insects, with more than 10% of species requiring the metabolic capabilities of intracellular bacteria for their nutrient acquisition. aphids harbor an obligate mutualism with the vertically transferred endosymbiont, buchnera aphidicola, which produces key nutrients lacking in the aphid's phloem-based diet that are necessary for normal development and reproduction. it is thought that, in some groups of insects, bacterial symbionts may play key roles ... | 2015 | 26516375 |
| comparison of relative bias, precision, and efficiency of sampling methods for natural enemies of soybean aphid (hemiptera: aphididae). | generalist natural enemies play an important role in controlling soybean aphid, aphis glycines (hemiptera: aphididae), in north america. several sampling methods are used to monitor natural enemy populations in soybean, but there has been little work investigating their relative bias, precision, and efficiency. we compare five sampling methods: quadrats, whole-plant counts, sweep-netting, walking transects, and yellow sticky cards to determine the most practical methods for sampling the three mo ... | 2015 | 26470267 |
| a cryptic species of aphis gossypii (hemiptera: aphididae) complex revealed by genetic divergence and different host plant association. | three cryptic species, aphis gossypii, aphis glycines, and aphis rhamnicola sp. nov., are recognized as sharing buckthorn plant, rhamnus spp. as primary hosts. these aphid species have morphological similarities; however, there are significant genetic differences between the three cryptic species. based on the high level of genetic divergence and the different secondary host association, we described a new species, aphis rhamnicola sp. nov., for apterous and alate vivipara, fundatrix, ovipara, a ... | 2015 | 25413997 |
| soybean aphid (hemiptera: aphididae) affects soybean spectral reflectance. | soybean aphid, aphis glycines matsumura (hemiptera: aphididae), is the most economically important insect pest of soybean in the north central united states. scouting-based integrated pest management (ipm) programs could become more efficient and more widely adopted by using plant spectral reflectance to estimate soybean aphid injury. our objective was to determine whether plant spectral reflectance is affected by soybean aphid feeding. field trials were conducted in 2013 and 2014 using caged pl ... | 2015 | 26470392 |
| soybean aphid infestation induces changes in fatty acid metabolism in soybean. | the soybean aphid (aphis glycines matsumura) is one of the most important insect pests of soybeans in the north-central region of the us. it has been hypothesized that aphids avoid effective defenses by inhibition of jasmonate-regulated plant responses. given the role fatty acids play in jasmonate-induced plant defenses, we analyzed the fatty acid profile of soybean leaves and seeds from aphid-infested plants. aphid infestation reduced levels of polyunsaturated fatty acids in leaves with a conco ... | 2015 | 26684003 |
| rag virulence among soybean aphids (hemiptera: aphididae) in wisconsin. | soybean aphid, aphis glycines matsumura, a pest of soybean, glycine max (l.) merr., and native of asia, invaded north america sometime before 2000 and rapidly became the most significant insect pest of soybean in the upper midwest. plant resistance, a key component of integrated pest management, has received significant attention in the past decade, and several resistance (rag) genes have been identified. however, the efficacy of rag (resistance to aphis glycines) genes in suppressing aphid abun ... | 2015 | 26470137 |
| inheritance of soybean aphid resistance in 21 soybean plant introductions. | the rag2 region was frequently identified among 21 f 2 populations evaluated for soybean aphid resistance, and dominant gene action and single-gene resistance were also commonly identified. the soybean aphid [aphis glycines matsumura (hemiptera: aphididae)] is one of the most important insect pests of soybean [glycine max (l.) merr] in the northern usa and southern canada, and four resistance loci (rag1-rag4) have been discovered since the pest was identified in the usa in 2000. the objective of ... | 2014 | 24072206 |
| reduction in fecundity and shifts in cellular processes by a native virus on an invasive insect. | pathogens and their vectors have coevolutionary histories that are intricately intertwined with their ecologies, environments, and genetic interactions. the soybean aphid, aphis glycines, is native to east asia but has quickly become one of the most important aphid pests in soybean-growing regions of north america. in this study, we used bioassays to examine the effects of feeding on soybean infected with a virus it vectors (soybean mosaic virus [smv]) and a virus it does not vector (bean pod mo ... | 2014 | 24682151 |
| incorporating natural enemy units into a dynamic action threshold for the soybean aphid, aphis glycines (homoptera: aphididae). | recommended action thresholds for soybean aphid, aphis glycines, do not adjust for natural enemy impact, although natural enemies contribute important biological control services. because individual natural enemy species have varied impacts on pest population dynamics, incorporating the impact of a diverse predator guild into an action threshold can be cumbersome. | 2014 | 24214819 |
| comparative metabolite profiling of foxglove aphids (aulacorthum solani kaltenbach) on leaves of resistant and susceptible soybean strains. | aphid infestations can cause severe decreases in soybean (glycine max [l.] merr.) yield. since planting aphid-resistant soybean strains is a promising approach for pest control, understanding the resistance mechanisms employed by aphids is of considerable importance. we compared aphid resistance in seven soybean strains and found that strain tohoku149 was the most resistant to the foxglove aphid, aulacorthum solani kaltenbach. we subsequently analyzed the metabolite profiles of aphids cultured o ... | 2014 | 24514152 |
| susceptibility of aphelinus certus (hymenoptera: aphelinidae) to neonicotinoid seed treatments used for soybean pest management. | soybean aphid is an economic pest of soybean in north america. currently, management of soybean aphid is achieved through the use of foliar- and seed-applied insecticides. however, natural enemies play an important role in regulating soybean aphid populations, and may be adversely affected by insecticides. the effects of imidacloprid and thiamethoxam seed treatments on the soybean aphid parasitoid, aphelinus certus yasnosh, were examined using a tritrophic bioassay. a. certus was able to parasit ... | 2014 | 25195435 |
| one gene versus two: a regional study on the efficacy of single gene versus pyramided resistance for soybean aphid management. | the soybean aphid (aphis glycines matsumura) is a threat to soybean production in the midwestern united states. varieties containing the rag1 soybean aphid resistance gene have been released with limited success in reducing aphid populations. furthermore, virulent biotypes occur within north america and challenge the durability of single-gene resistance. pyramiding resistance genes has the potential to improve aphid population suppression and increase resistance gene durability. our goal was to ... | 2014 | 25195462 |
| dl-β-aminobutyric acid-induced resistance in soybean against aphis glycines matsumura (hemiptera: aphididae). | priming can improve plant innate capability to deal with the stresses caused by both biotic and abiotic factors. in this study, the effect of dl-β-amino-n-butyric acid (baba) against aphis glycines matsumura, the soybean aphid (sa) was evaluated. we found that 25 mm baba as a root drench had minimal adverse impact on plant growth and also efficiently protected soybean from sa infestation. in both choice and non-choice tests, sa number was significantly decreased to a low level in soybean seedlin ... | 2014 | 24454805 |
| characterization of peroxidase changes in tolerant and susceptible soybeans challenged by soybean aphid (hemiptera: aphididae). | changes in protein content, peroxidase activity, and isozyme profiles in response to soybean aphid feeding were documented at v1 (fully developed leaves at unifoliate node, first trifoliate leaf unrolled) and v3 (fully developed leaf at second trifoliate node, third trifoliate leaf unrolled) stages of soybean aphid-tolerant (ks4202) and -susceptible (sd76r) soybeans. protein content was similar between infested and control v1 and v3 stage plants for both ks4202 and sd76r at 6, 16, and 22 d after ... | 2014 | 26309290 |
| egg load dynamics and the risk of egg and time limitation experienced by an aphid parasitoid in the field. | insect parasitoids and herbivores must balance the risk of egg limitation and time limitation in order to maximize reproductive success. egg and time limitation are mediated by oviposition and egg maturation rates as well as by starvation risk and other determinants of adult lifespan. here, we assessed egg load and nutritional state in the soybean aphid parasitoid binodoxys communis under field conditions to estimate its risk of becoming either egg- or time-limited. the majority of female b. com ... | 2014 | 24963373 |
| mapping an aphid resistance gene in soybean [glycine max (l.) merr.] p746. | soybean aphid (sa: aphis glycines matsumura) is one of the most serious pests of soybean [glycine max (l.) merr.] worldwide. a single dominant gene was found to control sa resistance in soybean line p746, which exhibits antibiosis resistance. this study aimed to define the location of the sa resistance gene in p746. a f2:3 mapping population, including 312 individuals, was created based on the cross of p746 and 'dongnong 47'. combined with bulked segregant analysis, all of the 1015 simple sequen ... | 2014 | 25501137 |
| abiotic and biotic stressors causing equivalent mortality induce highly variable transcriptional responses in the soybean aphid. | environmental stress affects basic organismal functioning and can cause physiological, developmental, and reproductive impairment. however, in many nonmodel organisms, the core molecular stress response remains poorly characterized and the extent to which stress-induced transcriptional changes differ across qualitatively different stress types is largely unexplored. the current study examines the molecular stress response of the soybean aphid (aphis glycines) using rna sequencing and compares tr ... | 2014 | 25538100 |
| aboveground feeding by soybean aphid, aphis glycines, affects soybean cyst nematode, heterodera glycines, reproduction belowground. | heterodera glycines is a cyst nematode that causes significant lost soybean yield in the u.s. recent studies observed the aphid aphis glycines and h. glycines interacting via their shared host, soybean, glycine max. a greenhouse experiment was conducted to discern the effect of a. glycines feeding on h. glycines reproduction. an h. glycines-susceptible cultivar, kenwood 94, and a resistant cultivar, dekalb 27-52, were grown in h. glycines-infested soil for 30 and 60 d. ten days after planting, p ... | 2014 | 24466080 |
| composition of the essential oil of cynanchum mongolicum (asclepiadaceae) and insecticidal activities against aphis glycines (hemiptera: aphidiae). | farmers have applied cynanchum mongolicum (maxim) to control crop pests. the aim of this study was to analyze composition of essential oil from c. mongolicum, evaluate insecticidal activities against aphis glycines, and lethal doses. | 2014 | 24914292 |
| microbiome diversity of aphis glycines with extensive superinfection in native and invasive populations. | associations among insects and microbes can lead to beneficial or parasitic interactions. using 454 sequencing of 16s rna genes, we compared microbiome diversity and abundance among field-collected (f) and laboratory-reared (l) populations of the invasive soybean aphid (aphis glycines), a pest of soybean. additionally, we screened a. glycines populations from native (japan, south korea and china) and invasive regions (north america) to broadly determine the microbiome diversity. our results sugg ... | 2014 | 24596263 |
| rna-seq reveals a xenobiotic stress response in the soybean aphid, aphis glycines, when fed aphid-resistant soybean. | while much recent research has expanded our understanding of the molecular interactions between aphids and their host plants, it is lacking for the soybean aphid, aphis glycines. since its north american invasion, a. glycines has become one of the most damaging insect pests on this important crop. five soybean genes for host plant resistance to a. glycines have been identified, but populations of a. glycines have already adapted to overcome these resistance genes. understanding the molecular int ... | 2014 | 25399334 |
| toxin delivery by the coat protein of an aphid-vectored plant virus provides plant resistance to aphids. | the sap-sucking insects (order hemiptera), including aphids, planthoppers, whiteflies and stink bugs, present one of the greatest challenges for pest management in global agriculture. insect neurotoxins offer an alternative to chemical insecticides for controlling these pests, but require delivery into the insect hemocoel. here we use the coat protein of a luteovirus, an aphid-vectored plant virus, to deliver a spider-derived, insect-specific toxin that acts within the hemocoel. the luteovirid c ... | 2014 | 24316580 |
| the use of refuge in host plant resistance systems for the control of virulent biotype adaptation in the soybean aphid (hemiptera: aphididae. | host plant resistant (hpr) crop varieties offer control of many insect pest species. however, the evolution of virulent biotypes capable of overcoming plant resistance poses challenges for the implementation of hpr. widespread planting of hpr crops further reduces hpr efficacy by increasing selection pressure on pests, favoring the rapid proliferation of virulence. an analogous situation occurs in managing insect resistance to transgenic bt crops, where planting of susceptible refuges effectivel ... | 2014 | 25195453 |
| application of dna barcoding to the identification of hymenoptera parasitoids from the soybean aphid (aphis glycines) in china. | aphis glycines matsumura is an important pest of soybean in asia and north america. hymenoptera parasitoids play a key role in the control of the soybean aphid. the correct identification of parasitoids is a critical step that precedes the assessment of their potential biological control agents. accurate identification of the majority of the species attacking the soybean aphid often requires elaborate specimen preparation and expert taxonomic knowledge. in this study, we facilitated the identifi ... | 2014 | 24339363 |
| identification and molecular mapping of two soybean aphid resistance genes in soybean pi 587732. | soybean [glycine max (l.) merr.] continues to be plagued by the soybean aphid (aphis glycines matsumura: sa) in north america. new soybean resistance sources are needed to combat the four identified sa biotypes. the objectives of this study were to determine the inheritance of sa resistance in pi 587732 and to map resistance gene(s). for this study, 323 f2 and 214 f3 plants developed from crossing pi 587732 to two susceptible genotypes were challenged with three sa biotypes and evaluated with ge ... | 2014 | 24705575 |
| plant dependence on rhizobia for nitrogen influences induced plant defenses and herbivore performance. | symbiotic rhizobia induce many changes in legumes that could affect aboveground interactions with herbivores. we explored how changing the intensity of bradyrhizobium japonicum, as modulated by soil nitrogen (n) levels, influenced the interaction between soybean (glycine max) and herbivores of different feeding guilds. when we employed a range of fertilizer applications to manipulate soil n, plants primarily dependent on rhizobia for n exhibited increased root nodulation and higher levels of fol ... | 2014 | 24451132 |
| the impact of prairie strips on aphidophagous predator abundance and soybean aphid predation in agricultural catchments. | reconstructing prairie vegetation in row crop-dominated agricultural landscapes may contribute to several ecosystem services, including the biological control of insect pests, such as the soybean aphid aphis glycines matsumura. the influence of the amount and configuration of reconstructed prairie vegetation on the delivery of ecosystem services was investigated in several small catchments at neal smith national wildlife refuge in iowa. treatments include catchments entirely in row crops under a ... | 2014 | 25199149 |
| soybean aphid (hemiptera: aphididae) response to soybean plant defense: stress levels, tradeoffs, and cross-virulence. | a variety of management methods to control the soybean aphid (aphis glycines matsumura) have been investigated since its invasion into north america in 2000, among them plant resistance has emerged as a viable option for reducing aphid damage to soybeans and preventing outbreaks. plant resistance methods often use natural soybean plant defenses that impose stress on aphids by reducing fitness and altering behavior. research efforts have heavily focused on identification and development of aphid ... | 2014 | 24472201 |
| inventory and assessment of foliar natural enemies of the soybean aphid (hemiptera: aphididae) in south dakota. | soybean aphid (aphis glycines matsumura) (hemiptera: aphididae) is a major pest of soybean in northern production regions of north america, and insecticides have been the primary management approach while alternative methods are developed. knowledge of arthropod natural enemies and their impact on soybean aphid is critical for developing biological control as a management tool. soybean is a major field crop in south dakota, but information about its natural enemies and their impact on soybean ap ... | 2014 | 24874151 |
| seasonal occurrence of aphis glycines and physiological responses of soybean plants to its feeding. | the soybean aphid aphis glycines matsumura (hemiptera: aphididae) is an important pest of soybean in china. to monitor and manage this pest effectively it is necessary to understand its population dynamics and demographics, as well as the physiological responses of soybean plants to its feeding. in this study, using field surveying and suction-trap monitoring, we investigated the population dynamics of the soybean aphid in xiuyan county, liaoning province in northeastern china during 2009-2012. ... | 2014 | 24376198 |
| core rnai machinery and sid1, a component for systemic rnai, in the hemipteran insect, aphis glycines. | rna interference (rnai) offers a novel tool to manage hemipteran pests. for the success of rnai based pest control in the field, a robust and systemic rnai response is a prerequisite. we identified and characterized major genes of the rnai machinery, dicer2 (dcr2), argonaute2 (ago2), and r2d2 in aphis glycines, a serious pest of soybean. the a. glycines genome encodes for at least one copy of dcr2, r2d2 and ago2. comparative and molecular evolution analyses (dn/ds) showed that domain regions of ... | 2013 | 23396108 |
| the endosymbiont arsenophonus is widespread in soybean aphid, aphis glycines, but does not provide protection from parasitoids or a fungal pathogen. | aphids commonly harbor bacterial facultative symbionts that have a variety of effects upon their aphid hosts, including defense against hymenopteran parasitoids and fungal pathogens. the soybean aphid, aphis glycines matsumura (hemiptera: aphididae), is infected with the symbiont arsenophonus sp., which has an unknown role in its aphid host. our research goals were to document the infection frequency and diversity of the symbiont in field-collected soybean aphids, and to determine whether arseno ... | 2013 | 23614027 |
| graph and circuit theory connectivity models of conservation biological control agents. | the control of agricultural pests is an important ecosystem service provided by predacious insects. in midwestern usa, areas of remnant tallgrass prairie and prairie restorations may serve as relatively undisturbed sources of natural predators, and smaller areas of non-crop habitats such as seminatural areas and conservation plantings (cp) may serve as stepping stones across landscapes dominated by intensive agriculture. however, little is known about the flow of beneficial insects across large ... | 2013 | 24261040 |
| within-plant bottom-up effects mediate non-consumptive impacts of top-down control of soybean aphids. | there is increasing evidence that top-down controls have strong non-consumptive effects on herbivore populations. however, little is known about how these non-consumptive effects relate to bottom-up influences. using a series of field trials, we tested how changes in top-down and bottom-up controls at the within-plant scale interact to increase herbivore suppression. in the first experiment, we manipulated access of natural populations of predators (primarily lady beetles) to controlled numbers ... | 2013 | 23431373 |
| environmental consequences of invasive species: greenhouse gas emissions of insecticide use and the role of biological control in reducing emissions. | greenhouse gas emissions associated with pesticide applications against invasive species constitute an environmental cost of species invasions that has remained largely unrecognized. here we calculate greenhouse gas emissions associated with the invasion of an agricultural pest from asia to north america. the soybean aphid, aphis glycines, was first discovered in north america in 2000, and has led to a substantial increase in insecticide use in soybeans. we estimate that the manufacture, transpo ... | 2013 | 23977273 |
| evaluation of late vegetative and reproductive stage soybeans for resistance to soybean aphid (hemiptera: aphididae). | the soybean aphid, aphis glycines matsumura, has become the most significant soybean [glycine max (l.) merrill] insect pest in the north central soybean production region of north america. the objectives of this research were to measure selected genotypes for resistance to the soybean aphid in the later vegetative and reproductive stages under field conditions, and confirm the presence of tolerance in ks4202. the results from 2007 to 2011 indicate that ks4202 can support aphid populations with m ... | 2013 | 23786098 |
| identification of novel sources of host plant resistance to known soybean aphid biotypes. | while soybean cultivars with resistance to the soybean aphid (aphis glycines matsumura) have been commercially released, the presence of virulent biotypes capable of overcoming plant resistance threatens the durability of host plant resistance as a stable management tactic. novel sources of host plant resistance are needed to combat rapid biotype evolution. in this study, we screened 1,061 soybean plant introductions (pis) for resistance to three known biotypes of a. glycines. based on a series ... | 2013 | 23865217 |
| effects of thiamethoxam seed treatments on soybean aphid (hemiptera: aphididae) feeding behavior. | since its discovery in north america in 2000, the soybean aphid, aphis glycines matsumura (hemiptera: aphididae), has rapidly become an important pest of soybean [glycine max (l.) merrill], sometimes resulting in significant yield losses. previous research has documented the toxicity of neonicotinoid seed treatments to soybean aphids, but control under field conditions has been inconsistent. imidacloprid, a popular neonicotinoid insecticide, has been shown to exhibit antifeedant effects on aphid ... | 2013 | 24498738 |
| genetic mapping of a novel gene for soybean aphid resistance in soybean (glycine max [l.] merr.) line p203 from china. | the soybean aphid (sa: aphis glycines matsumura) is a worldwide pest of soybean (glycine max [l.] merr.). the objectives of this study were to identify the type of aphid resistance and the resistance phenotype in soybean line 'p203', and to map the relative position of the gene involved. compared with cultivars 'p746' and 'dongnong 47', p203 was demonstrated to possess antixenosis resistance. p203 prevented aphids from reproducing in a choice test, but the resistance level decreased significantl ... | 2013 | 23754637 |