Abstract
The effectiveness of thiabendazole and benomyl for control of Aphelenchoides composticola and Ditylenchus myceliophagus on Agaricus bisporus was investigated in vitro. Thiabendazole at 2.5, 5, 10 and 20 ppm and benomyl at 5, 10 and 20 ppm inhibited multiplication of the nematodes over 3 weeks and prevented degeneration of the mycelium. Thiabendazole at concentrations up to 20 ppm did not significantly reduce growth of A. bisporus but benomyl at 10 and 20 ppm reduced colony diameter significantly. Nematodes were not killed by direct contact with or direct uptake of the chemicals. It is suggested that either the nematodes acquire a toxic dose or toxic derivatives from the host or the chemicals act by suppressing reproduction and development at concentrations which do not kill.
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