CITRUS LIMONOID EFFECTS ON COLORADO POTATO BEETLE LARVAL SURVIVAL ANDDEVELOPMENT

The effects of citrus limonoids, applied topically to potato (Solanum tuberosum L. var 'Katahdin') foliage, on Colorado potato beetle (Lepti notarsa decemlineata(Say) (Chrysomelidae) larval development, growth, and survival were quantified in laboratory assays and a small-plot fie ld test. In laboratory assays, survival, development rate, and body we ight decreased with increasing limonoid concentration, however these m easures of larval response did not significantly differ among varying periods of limonoid exposure (three, six, or nine days). Significant l imonoid application concentration and frequency effects on survival, d evelopment rate, and defoliation were observed in the field test. Thes e results indicate the potential utility of lethal and non-lethal effe cts of citrus limonoids for management of the Colorado potato beetle.