Monday, November 13, 2006 - 11:30 AM

Degradation of an Insecticide Used in the Quarantine Treatment of Japanese Beetle in Soils.

Samuel Dennis, Jason Oliver, and Kudjo Dzantor. Tennessee State Univ, 3500 John A. Merritt Blvd, Nashville, TN 37209

The Japanese beetle (Popillia japonica Newman) is a very destructive pest; known to cause large-scale damage to both horticultural and nursery stocks. Chlorpyrifos [(0,0-diethyl  0-(3,5,6-trichloro-2-pyridinynl) phosphorothioate] is a non-systemic organophosphate pesticide used to control soil-borne insects such as Japanese beetle grubs. The study was conducted to determine the degradation rate of chlorpyrifos in nursery soils. A 1X rate representing the application rate of chlorpyrifos used in the control of Japanese beetle in the field quarantine systems was used in a laboratory incubation study. Three soil types were used to ensure differences in soil particle size distribution. The degradation rates of chlorpyrifos tend to vary with tested soils.