The Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say) is the major foliar pest of potatoes in eastern and central Canada. Since its registration in 1995, application of the insecticide, ADMIRE, has been the preferred method of CPB-control. From 1998 to 2001, susceptibility to imidacloprid of 26-44 CPB-populations collected from across Canada was measured by contact (adult) or residual bioassay (second-instar larvae). While the range in susceptibility within each year did not significantly increase, a large jump in year-to-year susceptibility was recorded for some populations in 2001. This change in susceptibility could be an advance warning of the development of economic resistance. Results from the 2002 survey will confirm this conclusion or clarify the status of CPB-resistance in Canada.
Species 1: Coleoptera Chrysomelidae Leptinotarsa decemlineata (Colorado potato beetle)
Keywords: insecticides, resistance
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