Volume 16 Part 1 Article 31: Degradation of Pesticides During Mushroom Composting and Production

Volume 16 Part 1 Article 31
Year 2004
Title: Degradation of Pesticides During Mushroom Composting and Production
Authors: J.H. Yang and D.L. Rinker


Wash down water containing pesticides is recycled in preparation of compost for the commercial production of Agaricus bisporus. This research determined the degradation of endosulfan, diazinon, dimethoate, malathion, permethrin, captan, chlorothalonil and propiconazole in water and compost, and the accumulation of residues in mushroom tissues. An increase in pH and temperature augmented the hydrolysis of most pesticides, whereas diazinon underwent acidic hydrolysis and propiconazole was independent of temperature. Microbial degradation was the major pathway for diazinon, but a secondary pathway for malathion, dimethoate, chlorothalonil and the two isomers of endosulfan. The composting process significantly degraded most pesticides. Both propiconazole and permethrin were relatively persistent in both water and compost. No pesticide residues accumulated in mushrooms, and mushroom yield was not affected providing mycelial growth proceeded normally. The use of recycled water when coupled with the standard practices for mushroom composting and production does not pose a threat of pesticide contamination. However, persistence of propiconazole and permethrin could cause concern for the leachate from the spent substrate.

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