| optimal control of soybean aphid in the presence of natural enemies and the implied value of their ecosystem services. | by suppressing pest populations, natural enemies provide an important ecosystem service that maintains the stability of agricultural ecosystems systems and potentially mitigates producers' pest control costs. integrating natural control services into decisions about pesticide-based control has the potential to significantly improve the economic efficiency of pesticide use, with socially desirable outcomes. two gaps have hindered the incorporation of natural enemies into pest management decision ... | 2012 | 22208393 |
| An aphid-dip bioassay to evaluate susceptibility of soybean aphid (Hemiptera: Aphididae) to pyrethroid, organophosphate, and neonicotinoid insecticides. | Since the discovery of the soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), in North America in 2000, chemical control has been the most effective method to manage aphid outbreaks. Increased insecticide use in soybean raises the possibility of developing insecticide resistance in soybean aphid, and monitoring insecticide susceptibility is essential to maintain pesticide tools. We developed a simple and reliable aphid-dip bioassay by using a tea strainer that resulted in -90% survi ... | 2011 | 21882704 |
| electrical penetration graph analysis of the feeding behavior of soybean aphids on soybean cultivars with antibiosis. | the soybean aphid, aphis glycine matsumura (hemiptera: aphididae), is a major pest of soybean. in the current study, we used the electrical penetration graph technique to study feeding behavior of soybean aphids on antibiotic-resistant soybean lines ks1621, ks1613, and ks1642, and a susceptible soybean line, ks4202. we observed that soybean aphids spent significantly shorter periods of time in the sieve element phase but slightly more times in nonprobing phases in all three resistant lines than ... | 2011 | 22299372 |
| impacts of thiamethoxam seed treatment and host plant resistance on the soybean aphid fungal pathogen, pandora neoaphidis. | since the introduction of soybean aphid, aphis glycines matsumura, from asia, insecticide use in soybean has increased substantially in the north central united states. insecticide seed treatments and aphid resistant soybean varieties are management tactics that may reduce reliance on foliar applications of broad-spectrum insecticides. exploring potential nontarget impacts of these technologies will be an important step in incorporating them into aphid management programs. we investigated impact ... | 2011 | 22299341 |
| inheritance of resistance to aphis glycines in soybean p746 from china. | the soybean aphid (aphis glycines matsumura) is one of the most serious pests of soybean (glycine max [l.] merrill) worldwide. aphid resistance genes have been identified. however, little is known about genes for resistance to chinese soybean aphid strains. the objective of this study was to identify the type of aphid resistance in the soybean cultivar p746 and to determine the inheritance of the resistance. in choice and no-choice tests, significant differences in the average number of aphids a ... | 2012 | 23356083 |
| the response of natural enemies to selective insecticides applied to soybean. | natural enemies of the invasive pest aphis glycines matsumura can prevent its establishment and population growth. however, current a. glycines management practices include the application of broad-spectrum insecticides that affect pests and natural enemies that are present in the field at the time of application. an alternative is the use of selective insecticides that affect the targeted pest species, although having a reduced impact on the natural enemies. we tested the effects of esfenvalera ... | 2012 | 23321105 |
| rag1 aphid resistant soybeans alter the movement and distribution of soybean aphid (hemiptera: aphididae). | herbivorous insects often move and distribute according to the quality of the plant they are on, and this behavior could influence interactions with plants bred for herbivore resistance. however, when an insect is normally considered sedentary, less is known about the potential importance of movement. we performed experiments to determine if a resistant soybean variety alters the movement and distribution, both within and between plants, of the soybean aphid aphis glycines matsumura. we did this ... | 2012 | 23321089 |
| factors contributing to the poor performance of a soybean aphid parasitoid binodoxys communis (hymenoptera: braconidae) on an herbivore resistant soybean cultivar. | host plant resistance and biological control are important components of integrated pest management programs. however, plants expressing resistance to herbivores may also have direct or indirect negative effects on natural enemies simultaneously providing pest suppression. soybean aphids (aphis glycines matsumura) are invasive and serious pests of soybean (glycine max l.) in the united states. several soybean lines with aphid resistance have been identified, but the long-term impact of these res ... | 2012 | 23321088 |
| deep sequencing of the transcriptomes of soybean aphid and associated endosymbionts. | the soybean aphid has significantly impacted soybean production in the u.s. transcriptomic analyses were conducted for further insight into leads for potential novel management strategies. | 2012 | 22984624 |
| implementing an evolutionary framework for understanding genetic relationships of phenotypically defined insect biotypes in the invasive soybean aphid (aphis glycines). | adaptive evolution of pest insects in response to the introduction of resistant cultivars is well documented and commonly results in virulent (i.e., capable of feeding upon resistant cultivars) insect populations being labeled as distinct biotypes. phenotypically defined, biotypes frequently remain evolutionarily indistinct, resulting in ineffective application of virulence control measures and shorter durability of resistant cultivars. here, we utilize an evolutionary framework to discern the g ... | 2013 | 24187586 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| characterization of a chitin synthase encoding gene and effect of diflubenzuron in soybean aphid, aphis glycines. | chitin synthases are critical enzymes for synthesis of chitin and thus for subsequent growth and development in insects. we identified the cdna of chitin synthase gene (chs) in aphis glycines, the soybean aphid, which is a serious pest of soybean. the full-length cdna of chs in a. glycines (aychs) was 5802 bp long with an open reading frame of 4704 bp that encoded for a 1567 amino acid residues protein. the predicted aychs protein had a molecular mass of 180.05 kda and its amino acid sequence co ... | 2012 | 23139631 |
| 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 |
| 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 |
| 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 |
| 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 |
| soybean cyst nematode effects on soybean aphid preference and performance in the laboratory. | herbivores on plants frequently interact via shared resources. studies that have examined performance of herbivores in the presence of other herbivores, however, have often focused on above-ground feeding guilds and relatively less research has examined interactions between below- and above-ground consumers. we examine how soybean aphid, aphis glycines (matsumura) an above-ground phloem-feeding herbivore, interacts with a below-ground plant parasite, soybean cyst nematode, heterodera glycines (i ... | 2010 | 22546453 |
| 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 |
| 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 |
| 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 |
| 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 |
| effects of rag1 on the preference and performance of soybean defoliators. | the rag1 gene confers antibiotic resistance to soybean aphid, aphis glycines matsumura (hemiptera: aphididae), and in 2010, varieties expressing rag1 were released for commercial use in the united states. we do not know how rag1 varieties will influence the broader community of defoliating insects that inhabit soybean fields. in 2010 and 2011, the preference and performance of pest insects that defoliate soybeans [glycines max (l.) merr] were tested using rag1 and aphid-susceptible varieties. th ... | 2013 | 24498760 |
| 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 |
| 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 |
| sirna machinery in whitefly (bemisia tabaci). | rna interference has been emerged as an utmost tool for the control of sap sucking insect pests. systemic response is necessary to control them in field condition. whitefly is observed to be more prone to sirna in recent studies, however the sirna machinery and mechanism is not well established. | 2013 | 24391810 |
| 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 |
| comparative analysis of mitochondrial genomes of five aphid species (hemiptera: aphididae) and phylogenetic implications. | insect mitochondrial genomes (mitogenomes) are of great interest in exploring molecular evolution, phylogenetics and population genetics. only two mitogenomes have been previously released in the insect group aphididae, which consists of about 5,000 known species including some agricultural, forestry and horticultural pests. here we report the complete 16,317 bp mitogenome of cavariella salicicola and two nearly complete mitogenomes of aphis glycines and pterocomma pilosum. we also present a fir ... | 2013 | 24147014 |
| 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 |
| 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 |
| effect of soybean varieties on survival and fecundity of western corn rootworm. | the western corn rootworm, diabrotica virgifera virgifera leconte (coleoptera: chrysomelidae), is a major pest of corn (zea mays l.) in north america and has evolved resistance to crop rotation by ovipositing in alternate crops such as soybeans [glycine max (l.) merr.]. through experiments with plants grown in the greenhouse and the field, we tested whether soybeans with resistance to the soybean aphid, aphis glycines matsumura (hemiptera: aphididae), affected survival, fecundity, and consumptio ... | 2012 | 22606835 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 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 |
| 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 |
| 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 |
| 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 |
| feeding behavior comparison of soybean aphid (hemiptera: aphididae) biotypes on different soybean genotypes. | soybean aphids have become a serious pest of soybean, glycine max l. (merrill), since they were first detected in north america in 2000. three soybean aphid biotypes have been documented in the united states in the last 10 yr, but few studies have been done on their feeding behavior in the united states the electrical penetration graph is a convenient and successful tool to study the feeding behavior of piercing and sucking insects. this is the first attempt to study the feeding behavior differe ... | 2013 | 24224269 |
| 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 |
| 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 |
| population genetic structure and genetic diversity of soybean aphid collections from the usa, south korea, and japan. | following its recent invasion of north america, the soybean aphid (aphis glycines matsumura) has become the number one insect pest of soybean (glycine max l. merr.) in the north central states of the usa. a few studies have been conducted on the population genetic structure and genetic diversity of the soybean aphid and the source of its invasion in north america. molecular markers, such as simple sequence repeats (ssrs) are very useful in the evaluation of population structure and genetic diver ... | 2013 | 23957674 |
| 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 |
| 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 |
| mapping soybean aphid resistance genes in pi 567598b. | the soybean aphid (aphis glycines matsumura) has been a major pest of soybean [glycine max (l.) merr.] in north america since it was first reported in 2000. our previous study revealed that the strong aphid resistance of plant introduction (pi) 567598b was controlled by two recessive genes. the objective of this study was to locate these two genes on the soybean genetic linkage map using molecular markers. a mapping population of 282 f4:5 lines derived from ia2070 × e06902 was evaluated for aphi ... | 2013 | 23689742 |
| genetic mapping of three quantitative trait loci for soybean aphid resistance in pi 567324. | host-plant resistance is an effective method for controlling soybean aphid (aphis glycines matsumura), the most damaging insect pest of soybean (glycine max (l.) merr.) in north america. recently, resistant soybean lines have been discovered and at least four aphid resistance genes (rag1, rag2, rag3 and rag4) have been mapped on different soybean chromosomes. however, the evolution of new soybean aphid biotypes capable of defeating host-plant resistance conferred by most single genes demonstrate ... | 2013 | 23486080 |
| a multi-approach study to delineate interactions between carabid beetles and soybean aphids. | in recent years, the soybean aphid, aphis glycines matsumura, has become the most important exotic pest of soybean, glycine max (l.) merrill, in north america. given the significant yield losses that are reported, considerable effort has been expended to characterize the natural enemy community associated with this pest. several indigenous and naturalized predators have been identified as potential biological control agents, and these include carabid beetles, an abundant and important family of ... | 2013 | 23339789 |
| multiple phytohormone signals control the transcriptional response to soybean aphid infestation in susceptible and resistant soybean plants. | the soybean aphid (aphis glycines) is a major phloem-feeding pest of soybean (glycine max). a. glycines feeding can cause the diversion of photosynthates and transmission of plant viruses, resulting in significant yield losses. in this study, we used oligonucleotide microarrays to characterize the long-term transcriptional response to soybean aphid colonization of two related soybean cultivars, one with the rag1 aphid-resistance gene and one aphid-susceptible cultivar (without rag1). transcripto ... | 2013 | 22992001 |
| validation of reference genes for gene expression studies in aphis glycines (hemiptera: aphididae). | quantitative real-time polymerase chain reaction (qrt-pcr) is a common and robust tool for accurate quantification of mrna transcripts. to normalize results, a housekeeping gene ([hkg], reference gene or endogenous control gene) is mandatory. soybean aphid, aphis glycines matsumura (hemiptera: aphididae), is a significant soybean, glycine max (l.) merr., pest, yet gene expression and functional genomics studies are hindered by a lack of stable hkgs. we evaluated seven potential hkgs (sdfs, succi ... | 2012 | 22928326 |
| pan trapping soybean aphids (hemiptera: aphididae) using attractants. | since its introduction into the united states in the past 10 yr, soybean aphid, aphis glycines matsumura (hemiptera: aphididae), has been a damaging pest to soybean, glycine max (l.) merrill. during 2008 and 2009, fields in central and north central iowa experienced pockets of high soybean aphid populations. electroantennograms have shown that soybean aphid alatae are capable of detecting host plant volatiles and sex pheromones. here, we evaluated baited pan traps as a potential soybean aphid at ... | 2012 | 22812127 |
| field and laboratory evaluations of soybean lines against soybean aphid (hemiptera: aphididae). | the soybean aphid, aphis glycines matsumura (hemiptera: aphididae), is a major pest of soybean, glycine max (l.). merr., that significantly reduces yield in northern production areas of north america. insecticides are widely used to control soybean aphid outbreaks, but efforts are underway to develop host plant resistance as an effective alternative management strategy. here, previously identified resistant lines were evaluated in laboratory tests against field-collected populations of soybean a ... | 2012 | 22606833 |
| maintaining genetic diversity and population panmixia through dispersal and not gene flow in a holocyclic heteroecious aphid species. | heteroecious holocyclic aphids exhibit both sexual and asexual reproduction and alternate among primary and secondary hosts. most of these aphids can feed on several related hosts, and invasions to new habitats may limit the number of suitable hosts. for example, the aphid specialist aphis glycines survives only on the primary host buckthorn (rhamnus spp.) and the secondary host soybean (glycine max) in north america where it is invasive. owing to this specialization and sparse primary host dist ... | 2012 | 22549514 |
| impact of rag1 aphid resistant soybeans on binodoxys communis (hymenoptera: braconidae), a parasitoid of soybean aphid (hemiptera: aphididae). | multiple strategies are being developed for pest management of the soybean aphid, aphis glycines matsumura; however, there has been little published research thus far to determine how such strategies may influence each other, thereby complicating their potential effectiveness. a susceptible soybean (glycine max l.) variety without the rag1 gene and a near isogenic resistant soybean variety with the rag1 gene were evaluated in the laboratory for their effects on the fitness of the soybean aphid p ... | 2012 | 22507000 |
| spatial distribution of aphis glycines (hemiptera: aphididae): a summary of the suction trap network. | the soybean aphid, aphis glycines matsumura (hemiptera: aphididae), is an economically important pest of soybean, glycine max (l.) merrill, in the united states. phenological information of a. glycines is limited; specifically, little is known about factors guiding migrating aphids and potential impacts of long distance flights on local population dynamics. increasing our understanding of a. glycines population dynamics may improve predictions of a. glycines outbreaks and improve management effo ... | 2012 | 22420279 |
| soybean aphid (hemiptera: aphididae) development on soybean with rag1 alone, rag2 alone, and both genes combined. | aphis glycines matsumura (hemiptera: aphididae) can reduce the yield of aphid-susceptible soybean (glycine max (l.) merrill) cultivars. the rag1 and rag2 genes conferresistance to some biotypes of a. glycines. these genes individually can limit population growth of a. glycines and prevent yield loss. the impact of these genes when combined is not known. we compared the development of a. glycines on soybean with rag1 alone (r1/s2), rag2 alone (s1/r2), both genes combined (r1/r2), or neither gene ... | 2012 | 22420278 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |