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Theses/Dissertations

2013

Graduate Theses and Dissertations

Bacillus thuringiensis

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Full-Text Articles in Life Sciences

Fall Armyworm Spodoptera Frugiperda And Black Cutworm Agrotis Ipsilon Susceptibility And Avoidance To Bt Maize, And Implications For Global Insect Resistance Management, Rachel Renee Binning Jan 2013

Fall Armyworm Spodoptera Frugiperda And Black Cutworm Agrotis Ipsilon Susceptibility And Avoidance To Bt Maize, And Implications For Global Insect Resistance Management, Rachel Renee Binning

Graduate Theses and Dissertations

Bacillus thuringiensis (Bt) maize (Zea mays) was developed primarily for North American pests such as European corn borer (Ostrinia nubilalis). However, most Bt maize products are also cultivated outside of North America, where the primary pests are different and often have lower susceptibility to Bt toxins. As these Bt maize products are commercialized in new geographies, insect resistance management (IRM) plans for those geographies need to consider these new pest and toxin combinations, instead of assuming the same refuge strategy applies to all pests in all geographies. Before implementing an IRM plan that includes size, placement and configuration of refuge ...


Fitness Costs Associated With Resistance To Cry3bb1 Corn In Western Corn Rootworm, Amanda Hoffmann Jan 2013

Fitness Costs Associated With Resistance To Cry3bb1 Corn In Western Corn Rootworm, Amanda Hoffmann

Graduate Theses and Dissertations

Crops producing toxins derived from the bacterium Bacillus thuringiensis (Bt) are widely planted to manage insect pests, including western corn rootworm, Diabrotica virgifera virgifera LeConte (Coleoptera: Chrysomelidae), a significant maize pest. The evolution of resistance would diminish the effectiveness of this technology; however, fitness costs can delay resistance. We quantified the level of resistance and tested for fitness costs of resistance in western corn rootworm with resistance to transgenic maize (Zea mays L.) that produces the Bt toxin Cry3Bb1. Fitness costs were measured in two experiments with non-Bt maize, the first used three commercial hybrids and the second used three ...