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Effect of Cry3Bb Bt Corn and Tefluthrin on Postdispersal WeedSeed Predation

Published online by Cambridge University Press:  20 January 2017

Antonio DiTommaso ,
Matthew R. Ryan ,
Charles L. Mohler ,
Daniel C. Brainard ,
Rachel E. Shuler ,
Leslie L. Allee  and
John E. Losey
Antonio DiTommaso*
Affiliation:
Department of Crop and Soil Sciences, Cornell University, Ithaca, NY 14853
Matthew R. Ryan
Affiliation:
Department of Crop and Soil Sciences, Cornell University, Ithaca, NY 14853
Charles L. Mohler
Affiliation:
Department of Crop and Soil Sciences, Cornell University, Ithaca, NY 14853
Daniel C. Brainard
Affiliation:
Department of Horticulture, Michigan State University, East Lansing, MI 48824
Rachel E. Shuler
Affiliation:
Department of Crop and Soil Sciences, Cornell University, Ithaca, NY 14853
Leslie L. Allee
Affiliation:
Department of Entomology, Cornell University, Ithaca, NY 14853
John E. Losey
Affiliation:
Department of Entomology, Cornell University, Ithaca, NY 14853
*
Corresponding author's E-mail: ad97@cornell.edu
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Abstract

Indirect effects of insect control strategies on weed populations areimportant to consider when developing robust integrated pest managementstrategies. Weed seed predation rates were investigated in corn managedunder three contrasting treatments based on control practices for cornrootworm: (1) the transgenic crop Cry3Bb Bt corn, (2) the broad-spectruminsecticide tefluthrin, and (3) no insecticide control. This 2-yr fieldstudy conducted near Ithaca, NY, involved quantifying seed loss fromvelvetleaf, common lambsquarters, and giant foxtail in arenas with andwithout vertebrate exclosures. Velvetleaf and giant foxtail were unaffectedby the insecticide treatment; however, average seed predation of commonlambsquarters was lower in both the Bt corn (11.9%) and insecticide-treatedplots (11.8%) compared with control plots (17.5%) that did not receive anyinsecticide. Seed predation of common lambsquarters was not affected by thevertebrate exclosure. Lower seed predation in the transgenic Bt corn andinsecticide treatments was likely due to nontarget effects on carabids(Coleoptera: Carabidae). Although the reduction in seed predation was modestand limited to only one of the three weed species tested, our resultshighlight the need for greater risk assessment that includes the ecosystemservice of weed seed predation when considering insect pest managementoptions.

Keywords

Common lambsquarters, Chenopodium album L. CHEALcorn rootworm, Diabrotica spp.giant foxtail, Setaria faberi Herm. SETFAvelvetleaf, Abutilon theophrasti Medik. ABUTHcorn, Zea mays LBacillus thuringiensis var. kumamotoensis.Carabid beetlesintegrated pest managementnontarget effectsseed removaltransgenic crops

Information

Type
Weed Management
Information
Weed Science , Volume 62 , Issue 4 , December 2014 , pp. 619 - 624
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Meadowbrook School, Weston, MA 02493.

References

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