Vip3Aa-Resistant Corn Earworm Strain for Pesticide Screening
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Solution Overview
Problem
Pests evolve resistance to existing pesticides, necessitating the development of new biopesticides or modified versions to effectively control agricultural pests.
Innovation Solution
A genetically diverse strain of corn earworm, Helicoverpa zea, resistant to the Bt protein Vip3Aa is developed through selective breeding over multiple generations, which can be used in screening applications to test candidate pesticides for their ability to overcome resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing pesticides are used repeatedly, then pest control effectiveness is maintained initially, but pests evolve resistance over time reducing effectiveness
Solution Approach 1:
The patent creates a pre-adapted pest strain that already possesses resistance to Vip3Aa through selective breeding over multiple generations. This preliminary action allows researchers to screen candidate pesticides against a resistance model before field deployment, enabling proactive identification of effective compounds that can overcome evolved resistance rather than reacting to resistance problems after they occur.
Solution Approach 2:
The patent employs a dynamically evolving pest population model where resistance levels can be adjusted by controlling the selection pressure during breeding. This dynamic system allows researchers to create pest strains with varying degrees of resistance to match different field scenarios, enabling more realistic and flexible screening of pesticide candidates under diverse resistance conditions.
2Reliability
If new pesticides are developed to overcome resistance, then effectiveness against resistant pests improves, but development time and resource requirements increase
Solution Approach 1:
The pre-developed resistant pest strain serves as a ready-to-use screening tool that eliminates the need for researchers to conduct lengthy resistance selection programs themselves. By providing a commercially available, pre-adapted pest model, the patent significantly reduces the time required to screen and develop new pesticide candidates, allowing rapid identification of compounds effective against resistant pests.
3Adaptability or versatility
If resistant pest strains are created through selective breeding, then a screening tool for future pesticides is obtained, but the breeding process requires multiple generations and significant resources
Solution Approach 1:
The patent employs self-service principles in the breeding process by utilizing the pests' natural feeding behavior and growth characteristics to drive resistance selection. The selective breeding system leverages the inherent biological processes of the pest population, requiring minimal external intervention beyond providing controlled exposure to Vip3Aa and allowing natural selection to occur over successive generations, thereby reducing resource requirements compared to more intensive breeding methods.
Data Source
AI summary
Provided herein are compositions and methods for screening pesticides. In particular, provided herein are Bt resistant corn earworms, methods of generating such earworms, and the use of such earworms in screening applications.