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Abstract: Pythium oligandrum was isolated from mushroom compost with Pythium Black Compost symptoms from a number of mushroom farms in Australia In laboratory experiments, P. oligandrum inhibited the growth of Agaricus bisporus in mushroom compost for 28 days It grew in phase II compost in race-tubes at the rate of 20-30 mm a day at 24 5°C and was re-isolated up to the leading edge of the A. bisporus colony P. oligandrum was not isolated once the compost was fully colonised by A. bisporus. The thermal death point of P. oligandrum was between 50-5 5°C when treated in water for ten minutes and in compost it did not survive a 30 minutes treatment time with a temperature maximum of 53°C Air dried P. oligandrum remained viable even after eight hours dry heat treatment at 60°C and one hour at 90°C The fungicide propamocarb hydrochloride at 0 15 ml/kg of compost and cupric acetate at 25 ppm inhibited the growth of P. oligandrum. The substituted phenol disinfectant, Biogram, was effective at 0 75% with a ten minute treatment time On-farm studies did not identify a single source of P. oligandrum but soil on straw, soil from a nearby field and contamination of a phase II tunnel were thought to be probable sources.
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