Location: Plant Genetics Research
2012 Annual Report
The current project is related to parent project sub-objective 1.B “Evaluate our mCry3A-resistant colony for the heredity of this trait, whether the trait is maintained when selection is removed, and whether there are fitness costs associated with the trait.” and sub-objective 1.C. “Evaluate cross resistance in rootworm colonies selected for resistance to one rootworm product on other single and stacked trait products.” It also contributes to Component IIa of the National Program 304 Action Plan by developing increased knowledge of the biology, ecology, behavior, and genetics of pests, and plant traits conferring pest resistance.
Transgenic corn with resistance to corn rootworm larval feeding offers a viable alternative to insecticides for managing the most economically important insect pests of corn. Maintaining insect susceptibility to transgenic crops (resistance management) is in the interest of growers, the Environmental Protection Agency, and industry, but requires an understanding of corn rootworm biology that does not currently exist. A series of experiments conducted and data analyzed for this project included an evaluation of the potential for cross resistance between Syngenta’s transgenic events targeting rootworms. We also conducted experiments aimed at understanding heritability of resistance to Syngenta’s commercialized events and whether resistance is maintained when selection pressure is removed. Data that are important to seed companies and modelers in their attempts to optimize resistance management plans for transgenic corn may be required by the Environmental Protection Agency for commercialization, but are proprietary at this point.