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Article
Interactions Among Bt Maize, Entomopathogens, and Rootworm Species (Coleoptera: Chrysomelidae) in the Field: Effects on Survival, Yield, and Root Injury
Journal of Economic Entomology
  • Jennifer L. Petzold-Maxwell, Iowa State University
  • Stefan T. Jaronski, United States Department of Agriculture
  • Eric Harold Clifton, Iowa State University
  • Michael Wilson Dunbar, Iowa State University
  • Mark A. Jackson, United States Department of Agriculture
  • Aaron J. Gassmann, Iowa State University
Document Type
Article
Publication Date
2-1-2013
DOI
10.1603/EC12375
Abstract

A 2 yr field study was conducted to determine how a blend of entomopathogens interacted with Bt maize to affect mortality of Diabrotica spp. (Coleoptera: Chrysomelidae), root injury to maize (Zea maize L.) and yield. The blend of entomopathogens included two entomopathogenic nematodes, Steinernema carpocapsae Weiser and Heterorhabditis bacteriophora Poinar, and one entomopathogenic fungus, Metarhizium brunneum(Metschnikoff) Sorokin. Bt maize (event DAS59122–7, which produces Bt toxin Cry34/35Ab1) decreased root injury and survival of western corn rootworm (Diabrotica virgifera virgifera LeConte) and northern corn rootworm (Diabrotica barberi Smith & Lawrence) but did not affect yield. During year 1 of the study, when rootworm abundance was high, entomopathogens in combination with Bt maize led to a significant reduction in root injury. In year 2 of the study, when rootworm abundance was lower, entomopathogens significantly decreased injury to non-Bt maize roots, but had no effect on Bt maize roots. Yield was significantly increased by the addition of entomopathogens to the soil. Entomopathogens did not decrease survival of corn rootworm species. The results suggest that soil-borne entomopathogens can complement Bt maize by protecting roots from feeding injury from corn rootworm when pest abundance is high, and can decrease root injury to non-Bt maize when rootworm abundance is low. In addition, this study also showed that the addition of entomopathogens to soil contributed to an overall increase in yield.

Comments

This article is from Journal of Economic Entomology 106 (2013): 622, doi:10.1603/EC12375.

Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
Date Available
201-09-25
File Format
application/pdf
Citation Information
Jennifer L. Petzold-Maxwell, Stefan T. Jaronski, Eric Harold Clifton, Michael Wilson Dunbar, et al.. "Interactions Among Bt Maize, Entomopathogens, and Rootworm Species (Coleoptera: Chrysomelidae) in the Field: Effects on Survival, Yield, and Root Injury" Journal of Economic Entomology Vol. 106 Iss. 2 (2013) p. 622 - 632
Available at: http://works.bepress.com/aaron_gassmann/40/