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Funded Project |
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Funding Program:
Integrated Pest Management Competitive Grants Program |
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Project Title:
Dispersal of Lygus and Natural Enemies: Implications for Refuges in
Managing Resistance to Bt Cotton |
Project Directors (PDs):
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Lead State: AZ Lead Organization: University of Arizona |
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Cooperating State(s):
Arizona |
| Undesignated Funding: $29,945 |
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Start Date: Mar-02-2015 End Date: Feb-29-2016 |
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Pests Involved: Lygus bugs |
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Site/Commodity: Southwest U.S./Cotton/alfalfa |
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Area of Emphasis: Resistance Management, transgenics |
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Summary:
Bt cotton has reduced the economic and environmental impacts of repetitive insecticide applications used to combat lepidopteran pests. A key to sustaining the efficacy of Bt cotton for these pests has been the deployment of a fixed non-Bt cotton refuge to manage resistance evolution. In other production regions natural refuges have been successfully deployed; include wild vegetation and other crops that the Bt targeted pest will feed upon and reproduce to generate susceptible insects that can mate with and dilute any resistance alleles in insects that may arise in the Bt crop. With the near elimination of many lepidopteran pests due to effective management of Bt cotton programs, and the use of selective insecticides for whitefly control, the most significant cotton pest in western cotton is now the western tarnished plant bug, Lygus hesperus. New Bt cotton varieties are in the advanced stages of development that are targeted for Lygus control. A major consideration to address before introducing such varieties is to determine if a refuge strategy will be effective at mitigating resistance. Therefore, it is critical that we have a thorough knowledge of the temporal and spatial dispersal patterns of Lygus in the agroecosystem. We propose to use state-of-the art mark-capture methods to study the movement of Lygus between alfalfa (a preferred host plant) and cotton over the course of a cotton growing season. These findings will provide the critical information needed to determine if refuges will be a viable tactic for managing Lygus resistance to Lygus-specific Bt cotton.
Objectives: To determine the patterns of Lygus and natural enemy movement between alfalfa and adjacent cotton throughout the cotton growing season. |
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