Effect of Bt Maize and Soil Insecticides on Yield, Injury, and Rootworm Survival: Implications for Resistance Management

dc.contributor.author Petzold-Maxwell, Jennifer
dc.contributor.author Meinke, Lance
dc.contributor.author Gassmann, Aaron
dc.contributor.author Gray, Michael
dc.contributor.author Estes, Ronald
dc.contributor.author Gassmann, Aaron
dc.contributor.department Entomology
dc.date 2018-02-14T18:31:07.000
dc.date.accessioned 2020-06-30T02:22:12Z
dc.date.available 2020-06-30T02:22:12Z
dc.date.copyright Tue Jan 01 00:00:00 UTC 2013
dc.date.embargo 2015-09-25
dc.date.issued 2013-10-01
dc.description.abstract <p>A 2-yr field experiment was conducted to determine the effects on <em>Diabrotica</em> spp. (Coleoptera: Chrysomelidae) of an insecticidal seed treatment (Poncho 1250, (AI) /clothianidin) and a granular insecticide (Aztec 2.1G, (AI)/tebupirimphos and cyfluthrin) alone and in combination with maize producing the insectidical toxin Cry3Bb1 derived from the bacterium <em>Bacillus thuringiensis</em> (Bt). Yields for Bt maize plots were significantly greater than for non-Bt maize; however, insecticides did not significantly affect yield. Insecticides significantly decreased root injury in non-Bt maize plots, but there were no significant differences in root injury between Bt maize with or without either insecticide. Maize producing the Bt toxin Cry3Bb1 and the soil-applied insecticide Aztec significantly decreased survival of western corn rootworm (<em>Diabrotica virgifera virgifera</em> LeConte), while only Bt maize significantly decreased survival of the northern corn rootworm (<em>Diabrotica barberi</em> Smith & Lawrence). For both species, Bt maize and each of the insecticides delayed emergence. In the absence of density-dependent mortality, Bt maize imposed 71 and 80% reduction in survival on the western corn rootworm and the northern corn rootworm, respectively. The data from this study do not support combining insecticide with Bt maize because the addition of insecticide did not increase yield or reduce root injury for Bt maize, and the level of rootworm mortality achieved with conventional insecticide was likely too low to delay the evolution of Bt resistance. In addition, delays in emergence from Bt maize combined with insecticides could promote assortative mating among Bt-selected individuals, which may hasten resistance evolution.</p>
dc.description.comments <p>This article is from <em>Journal of Economic Entomology</em> 106 (2013): 1941, doi:<a href="http://dx.doi.org/10.1603/EC13216">10.1603/EC13216</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/ent_pubs/175/
dc.identifier.articleid 1178
dc.identifier.contextkey 6163192
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ent_pubs/175
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/23779
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ent_pubs/175/2013_Gassmann_EffectBtMaize.pdf|||Fri Jan 14 21:24:19 UTC 2022
dc.source.uri 10.1603/EC13216
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Entomology
dc.subject.disciplines Systems Biology
dc.subject.keywords Diabrotica barberi
dc.subject.keywords Diabrotica virgifera virgifera
dc.subject.keywords pesticide mixture
dc.subject.keywords pyramid
dc.subject.keywords resistance management
dc.title Effect of Bt Maize and Soil Insecticides on Yield, Injury, and Rootworm Survival: Implications for Resistance Management
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 59bd52a0-183d-4ea1-b353-4b07440b1e9f
relation.isOrgUnitOfPublication f47c8cad-50be-4fb0-8870-902ff536748c
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