Evaluation of Pyrethroids and Organophosphates in Insecticide Mixtures for Management of Western Corn Rootworm Larvae

dc.contributor.author Gassmann, Aaron
dc.contributor.author Norris, Edmund
dc.contributor.author Masloski, Kenneth
dc.contributor.author Coats, Joel
dc.contributor.author Gassmann, Aaron
dc.contributor.department Entomology
dc.date 2020-06-09T13:53:51.000
dc.date.accessioned 2020-06-30T02:25:20Z
dc.date.available 2020-06-30T02:25:20Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 2020
dc.date.embargo 2021-06-05
dc.date.issued 2020-06-05
dc.description.abstract <p>BACKGROUND: The western corn rootworm is an economically important pest of corn. Management tactics include pyrethroid and organophosphate insecticides, which may be applied as a mixture to protect corn roots. The goal of our study was to characterize the effects of pyrethroids and organophosphates alone and in combination on larval corn rootworm mortality and injury to corn roots. We evaluated two insecticide combinations: tebupirimphos with β- cyfluthrin, and chlorethoxyfos with bifenthrin. Using a soil-based, laboratory bioassay, we exposed larvae to five concentrations of the pyrethroid alone, the organophosphate alone, the combined formulation, and a water control. We calculated LC50 values and co-toxicity factors to determine synergism or antagonism between organophosphates and pyrethroids. We also measured adult emergence and root injury in a field experiment that tested tebupirimphos alone, β-cyfluthrin alone, the combined formulation, and an untreated control.</p> <p>RESULTS: Bioassay results indicated antagonism between the pyrethroid and organophosphate at most concentrations for both insecticide combinations. In the field experiment, tebupirimphos alone or in combination with β-cyfluthrin significantly reduced adult emergence and root injury compared to the untreated controls, but β-cyfluthrin alone did not differ from the untreated control for either metric.</p> <p>CONCLUSIONS: These results suggest that, at the concentrations tested, the pyrethroid component of pyrethroid-organophosphate mixtures may not contribute to a reduction of rootworm emergence or root injury. While these pyrethroids may confer a management benefit for other pests, such as seedcorn maggot, the concentrations of pyrethroids present in current formulations of these mixtures are likely too low for effective rootworm management.</p>
dc.description.comments <p>This is the peer reviewed version of the following article: St. Clair, Coy R., Edmund J. Norris, Kenneth E. Masloski, Joel R. Coats, and Aaron J. Gassmann. "Evaluation of Pyrethroids and Organophosphates in Insecticide Mixtures for Management of Western Corn Rootworm Larvae." <em>Pest Management Science</em> (2020), which has been published in final form at doi: <a href="https://doi.org/10.1002/ps.5938">10.1002/ps.5938</a>. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/ent_pubs/574/
dc.identifier.articleid 1576
dc.identifier.contextkey 18031486
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ent_pubs/574
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/24214
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/ent_pubs/574/2020_Coats_EvaluationPyrethroidsManuscript.pdf|||Sat Jan 15 00:59:51 UTC 2022
dc.source.uri 10.1002/ps.5938
dc.subject.disciplines Agriculture
dc.subject.disciplines Entomology
dc.subject.keywords antagonism
dc.subject.keywords insecticide
dc.subject.keywords organophosphate
dc.subject.keywords pyrethroid
dc.subject.keywords western corn rootworm
dc.title Evaluation of Pyrethroids and Organophosphates in Insecticide Mixtures for Management of Western Corn Rootworm Larvae
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isAuthorOfPublication 8bcdfc38-7da7-4e3c-8039-e495b01cc710
relation.isOrgUnitOfPublication f47c8cad-50be-4fb0-8870-902ff536748c
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