Tuesday, December 11, 2007 - 2:35 PM
1086

Acute toxicity and feeding reduction of imidacloprid and six metabolites in male and female of emerald ash borer adults, Agrilus planipennis Fairmaire (Coleoptera: Buprestidae)

David Mota-Sanchez, motasanc@msu.edu, Michigan State University, Department of Entomology, 206 Center for Integrated Plant Systems, East Lansing, MI, Bert M. Cregg, cregg@msu.edu, Michigan State University, Horticulture and Forestry, 214 Plant and Soil Science Building, East Lansing, MI, Deborah G. McCullough, mccullo6@msu.edu, Michigan State University, Department of Entomology/Department of Forestry, 243 Natural Science Building, East Circle Drive, East Lansing, MI, Therese M. Poland, tpoland@fs.fed.us, USDA Forest Service, 1407 S. Harrison Rd, East Lansing, MI, and Robert M. Hollingworth, rmholl@msu.edu, Michigan State University, Entomology, 206 CIPS, East Lansing, MI.

Treatment with imidacloprid is used to control the emerald ash borer (EAB), Agrilus planipennis Fairmaire (Coleoptera: Buprestidae). The main action of this compound is through the ingestion of treated leaves by adult beetles. Through the field season imidacloprid can be converted to other metabolites. The objective of this research was to investigate the effect acute oral toxicity of imidacloprid and six metabolites (olefine, 5-hydroxyimidacloprid, 4,5-dihydroxyimidacloprid, desnitroimidacloprid, urea derivative and 6-chloronicotinic acid) and the feeding effects of those compounds in adults of both sexes. Higher toxicity was observed for males than females. This difference may partially be due to differences in weight of the males (29 mg) and females (44 mg). The LD50s for imidacloprid were 2.38 ng/male, and 8.67 ng/female; the LD50s for the olefine were 6.7 ng/male and 8.55ng/female; for the 5-hydroxyimidacloprid the LD50s were 18.2 ng/male and 44.9 ng/female. Low toxicity was observed for the rest of metabolites even at doses of 1000 ng/insect. Imidacloprid and its metabolites (mainly olefine, 5-hydroxyimidacloprid, 4,5-dihydroxyimidacloprid) caused reduced feeding by adult EAB. Reduced feeding combined with with acute toxicity very likely increased insect mortality in this research


Species 1: Coleoptera Buprestidae Agrilus planipennis (emerald ash borer)

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