Adaptation by Western Corn Rootworm (Coleoptera: Chrysomelidae) to Bt Maize: Inheritance, Fitness Costs, and Feeding Preference
Jennifer L. Petzold-Maxwell,Ximena Cibils-Stewart,Ximena Cibils-Stewart,B. Wade French,Aaron J. Gassmann +4 more
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The resistant strain developed faster and had increased survival on Bt maize relative to a susceptible strain, and results from reciprocal crosses of the resistant and susceptible strains indicated that inheritance of resistance was nonrecessive.Abstract:
We examined inheritance of resistance, feeding behavior, and fitness costs for a laboratory-selected strain of western corn rootworm, Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae), with resistance to maize (Zea maize L.) producing the Bacillus thuringiensis Berliner (Bt) toxin Cry3Bb1. The resistant strain developed faster and had increased survival on Bt maize relative to a susceptible strain. Results from reciprocal crosses of the resistant and susceptible strains indicated that inheritance of resistance was nonrecessive. No fitness costs were associated with resistance alleles in the presence of two entomopathogenic nematode species, Steinernema carpocapsae Weiser and Heterorhabditis bacteriophora Poinar. Larval feeding studies indicated that the susceptible and resistant strains did not differ in preference for Bt and non-Bt root tissue in choice assays.read more
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Book ChapterDOI
Detection and Mechanisms of Resistance Evolved in Insects to Cry Toxins from Bacillus thuringiensis
TL;DR: The most recent advances on resistance mechanisms to Bt toxins are summarized in both laboratory-selected strains and field-evolved populations, with some implications for resistance management and directions for future research are suggested.
Journal ArticleDOI
Early Detection and Mitigation of Resistance to Bt Maize by Western Corn Rootworm (Coleoptera: Chrysomelidae)
David A. Andow,Steven G. Pueppke,Arthur W. Schaafsma,Aaron J. Gassmann,Thomas W. Sappington,Lance J. Meinke,Paul D. Mitchell,Terrance M. Hurley,Richard L. Hellmich,R. Pat Porter +9 more
TL;DR: Adaptive IRM approaches and pro-active, integrated IRM-pest management strategies are needed and should be in place before release of new technologies that produce less than a high-dose, to preserve the utility of corn rootworm Bt maize.
Journal ArticleDOI
Bt resistance in Australian insect pest species
TL;DR: Recent advances and future possibilities to estimate Bt resistance in Australian pest species are explored and what is seen as the critical data for enabling effective pre-emptive strategies are defined.
Journal ArticleDOI
Resistance evolution to the first generation of genetically modified Diabrotica-active Bt-maize events by western corn rootworm: management and monitoring considerations.
TL;DR: It is concluded that further research is needed to resolve the remaining scientific uncertainty related to the appropriateness of the HDR in delaying resistance evolution in WCR, and that integrated pest management reliant on multiple tactics should be deployed to ensure effective long-term corn rootworm management and sustainable use of Bt-maize.
Journal ArticleDOI
Greenhouse-Selected Resistance to Cry3Bb1-Producing Corn in Three Western Corn Rootworm Populations
TL;DR: Selecting in the greenhouse for resistance to Cry3Bb1 corn in three colonies of WCR derived from Kansas, Minnesota, and Wisconsin underlines the importance of effective resistance management for this pest.
References
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A method of computing the effectiveness of an insecticide
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Gerry P. Quinn,Michael J. Keough +1 more
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Journal ArticleDOI
Sustainability of Transgenic Insecticidal Cultivars: Integrating Pest Genetics and Ecology
TL;DR: Theoretical and practical issues involved in implementing strategies to delay pest adaptation to insecticidal cultivars are reviewed and emphasis is placed on examining the "high dose"/refuge strategy that has become the goal of industry and regulatory authorities.