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Funded Project

Funding Program: IPM Partnership Grants

Project Title: Monitoring Resistance in Colorado Potato Beetle Populations to Imidacloprid and Other Neonicotinoids

Project Director (PD): Galen Dively [1]

Lead State: MD Lead Organization: University of Maryland

Undesignated Funding: $14,674

Start Date: Apr-01-2004 End Date: Mar-31-2005

Pests Involved: Colorado potato beetles

Site/Commodity: potatoes

Area of Emphasis: resistance

Summary: Heavy selection pressure from soil treatments of imidacloprid has led to shifts towards resistance in Colorado potato beetle populations. Given the history of this insect, resistance development and its potential impacts on other neonicotinoids and potato pest management is an emerging issue in the northeast. Using previous baseline data on susceptibility to imidacloprid, a monitoring program will be conducted to detect early stages of resistance in potato beetle populations from Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York, Massachusetts, and Maine. Collaborators in each state will collect and ship beetles to Maryland where diet-incorporation bioassay will quantify concentration-mortality responses. Populations will also be tested for thiamethoxam susceptibility since this related neonicotinoid exhibits cross-resistance and has replaced imidacloprid on many potato farms. Bioassay results documenting departures from baseline susceptibility will help to convince growers to use insecticides with different modes of action or implement other resistance management practices before field control fails. Questionnaire surveys will document adoption of resistance management practices. Objectives: Final Report 2005

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