Impact of Reduced-Risk Insecticides on Soybean Aphid and Associated Natural Enemies

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dc.contributor.author Ohnesorg, Wayne
dc.contributor.author Johnson, Kevin
dc.contributor.author O'Neal, Matthew
dc.contributor.author O'Neal, Matthew
dc.contributor.department Entomology
dc.date 2018-02-13T13:10:56.000
dc.date.accessioned 2020-06-30T02:21:54Z
dc.date.available 2020-06-30T02:21:54Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2009
dc.date.embargo 2013-07-26
dc.date.issued 2009-10-01
dc.description.abstract <p>Insect predators in North America suppress <em>Aphis glycines</em>Matsumura (Hemiptera: Aphididae) populations; however, insecticides are required when populations reach economically damaging levels. Currently, insecticides used to manage <em>A. glycines</em> are broad-spectrum (pyrethroids and organophosphates), and probably reduce beneficial insect abundance in soybean, <em>Glycine max</em> (L.) Merr. Our goal was to determine whether insecticides considered reduced-risk by the Environmental Protection Agency could protect soybean yield from <em>A. glycines</em> herbivory while having a limited impact on the aphid's natural enemies. We compared three insecticides (imidacloprid, thiamethoxam, and pymetrozine,) to a broad-spectrum insecticide (λ-cyhalothrin) and an untreated control using two application methods. We applied neonicotinoid insecticides to seeds (imidacloprid and thiamethoxam) as well as foliage (imidacloprid); pymetrozine and λ-cyhalothrin were applied only to foliage. Foliage-applied insecticides had lower <em>A. glycines</em> populations and higher yields than the seed-applied insecticides. Among foliage-applied insecticides, pymetrozine and imidacloprid had an intermediate level of <em>A. glycines</em> population and yield protection compared with λ-cyhalothrin and the untreated control. We monitored natural enemies with yellow sticky cards, sweep-nets, and direct observation. Before foliar insecticides were applied (i.e., before aphid populations developed) seed treatments had no observable effect on the abundance of natural enemies. After foliar insecticides were applied, differences in natural enemy abundance were observed when sampled with sweep-nets and direct observation but not with yellow sticky cards. Based on the first two sampling methods, pymetrozine and the foliage-applied imidacloprid had intermediate abundances of natural enemies compared with the untreated control and λ-cyhalothrin.</p>
dc.description.comments <p>This article is from<em> Journal of Economic Entomology</em> 102(5):1816-1826. 2009 <br />doi: <a href="http://dx.doi.org/10.1603/029.102.0512">10.1603/029.102.0512</a></p>
dc.format.mimetype pdf
dc.identifier archive/lib.dr.iastate.edu/ent_pubs/14/
dc.identifier.articleid 1013
dc.identifier.contextkey 4352584
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ent_pubs/14
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/23743
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ent_pubs/14/2009_ONeal_ImpactOfReducedRiskInsecticides_23.pdf|||Fri Jan 14 20:05:58 UTC 2022
dc.source.uri 10.1603/029.102.0512
dc.subject.disciplines Agriculture
dc.subject.disciplines Entomology
dc.subject.keywords Glycine max
dc.subject.keywords biological control
dc.subject.keywords insecticide regulation
dc.subject.keywords conservation
dc.subject.keywords nontarget impacts
dc.title Impact of Reduced-Risk Insecticides on Soybean Aphid and Associated Natural Enemies
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication cdca6b0a-65c4-45dc-a6e4-4f0f1035f453
relation.isOrgUnitOfPublication f47c8cad-50be-4fb0-8870-902ff536748c
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