Stability of Three Ureide Insect Chitin-Synthesis Inhibitors in Mushroom Compost Determined by Chemical and Bioassay Techniques1

Abstract
In tests conducted to determine the stability of selected insecticides in compost used to grow mushrooms, 3 ureide insecticides, diflubenzuron (N-[[(4-chlorophenyl)amino]carbonyl]-2,6-difluorobenzamide), BAY SIR 8514 (2-chloro-N-[[(4-trifluoromethoxyphenyl)amino]carbonyl]benzamide), and Lilly 7063 (N-[[[5-(4-bromophenyl)-6-methyl-2-pyrazinyl]amino]carbonyl]-2-chlorobenzamide), were much more stable than the 3 phosphorus-containing insecticides tested, diazinon, ethoprop, and chlorpyrifos, although chlorpyrifos provided up to 80% fly control for 6 weeks. Residues were assayed by means of both an established bioassay with a sciarid fly, Lycoriella mali (Fitch), and with a newly developed chemical method based on high performance liquid chromatography.

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