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Abstract

Dennis, S.O., J. Oliver and P. Nveawiah –Yoho.2008. Monitoring the persistence of chlorpyrifos used in Japanese beetle larvae control in field grown balled and burlapped nursery stock. JEMREST 5:00-00

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 persistence of chlorpyrifos applied by drenching the soils in the balled and burlapped (B&B) nursery plant. The specific objective of the study was to evaluate the residue levels of chlorpyrifos in the B&B soils at 1, 2, and 4 months after the chemical application. A 1X rate (0.907kg ai/378Liters) representing the application rate of chlorpyrifos used in the control of Japanese beetle in field quarantine systems was used as the drench treatment. It was hypothesized that chlorpyrifos, the pesticide used in the study, will decline with time under field conditions. Results from the study shows chorpyrifos present in all the soil samples analyzed except control, with the highest concentrations recovered from the one-month soil samples and the lowest concentrations level recovered from the four-month post treatment with the pesticide. Thus indicating the persistence of the chemical even after four months of application.