| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| soybean aphid (aphididae: hemiptera) population growth as affected by host plant resistance and an insecticidal seed treatment. | the soybean aphid, aphis glycines matsumura (hemiptera: aphididae) is a significant soybean pest in the north central united states. insecticidal seed treatments and host plant resistance are two commercially available management tools. here we investigate the efficacy of both management tools throughout the season. soybean lines containing the soybean aphid resistance genes rag1, rag2, or both rag1 + rag2 were compared with a near-isogenic aphid-susceptible line. each line was grown in field pl ... | 2013 | 23865195 |
| lysiphlebus orientalis (hymenoptera, braconidae), a new invasive aphid parasitoid in europe - evidence from molecular markers. | we report the occurrence of lysiphlebus orientalis in serbia, an aphid parasitoid from the far east that is new to europe and has the potential to become invasive. our finding based on morphological characters is confirmed by analyses of mitochondrial cytochrome oxidase subunit i sequences. an increase in number and an expansion of the host range were observed during field studies over the past two years, and it is determined that the current host range encompasses nine aphid hosts on 12 differe ... | 2013 | 23448286 |
| molecular characterization and expression analysis of soluble trehalase gene in aphis glycines, a migratory pest of soybean. | in insects, the enzyme trehalase plays a crucial role in energy metabolism, chitin synthesis and possibly during plant-insect interactions. we have characterized a soluble trehalase gene (tre-1) from cdna of aphis glycines, a serious migratory pest of soybean. the full-length cdna of tre-1 in a. glycines (aytre-1) was 2550 bp long with an open reading frame of 1770 bp that encoded for a 589 amino acid residues protein. sequence assessment and phylogenetic analysis of the putative protein suggest ... | 2013 | 23445549 |
| 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 |
| measuring the benefit of biological control for single gene and pyramided host plant resistance for aphis glycines (hemiptera: aphididae) management. | the soybean aphid, aphis glycines matsumura (hemiptera: aphididae), is an economically important pest in the north central united states. in the state of iowa, economically damaging populations occurred in seven of 11 growing seasons from 2001 to 2011. the high frequency and economic impact of the soybean aphid makes it an ideal candidate for management by using host plant resistance. we compared an aphid-susceptible line to near-isolines that contain rag1 and rag2, both alone and pyramided toge ... | 2012 | 23156184 |
| development and parasitism by aphelinus certus (hymenoptera: aphelinidae), a parasitoid of aphis glycines (hemiptera: aphididae). | since its introduction in 2000, the soybean aphid (aphis glycines matsumura) has been a serious pest of soybean in north america. currently, insecticide application is the only recommended control method. however, a number of natural enemies have the potential to regulate soybean aphid populations. in 2007, aphelinus certus yasnosh, a soybean aphid parasitoid native to asia, was found in commercial soybean fields in ontario. this is the first record of this species in north america. to evaluate ... | 2010 | 22546454 |