Persistence and Movement of Four Insecticides Applied to Turfgrass1

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Abstract
Residue analyses were performed on samples of turfgrass treated with chlordane, diazinon, chlorpyrifos, and CGA 12223 (O,O-diethyl 0 [1-isopropyl-5-chloro-l, 2,4-triazolyl (3)] phosphorothioate) when applied under optimum conditions at rates normally recommended for control of soil insects which damage turf. Subsequently, samples were taken at intervals up to 56 days after treatment and analyzed for insecticide residues in the grass-thatch layer, in the root zone, and in the underlying soil. Approximately 60% of the chlordane was recovered from the grass-thatch layer after 56 days while only 9% of the chlorpyrifos remained at that time. Diazinon and CGA 12223 disappeared within 14 days. Little downward movement of any of the insecticides into the root and soil zones was detected. These results indicate that, with the exception of chlordane, timing of application of some commonly used insecticides is extremely important for adequate control of turf insect pests.