Volume 16 Part 1 Article 57: Green Mold Harbored by Wood: Post-crop Steaming and Preservatives

Volume 16 Part 1 Article 57
Year 2004
Title: Green Mold Harbored by Wood: Post-crop Steaming and Preservatives
Authors: N.J. Catlin, P.J. Wuest and D.M. Beyer

Abstract:

Two wood species, Taxodium distictum (bald cypress) and Tsuga canadensis (hemlock), which are used in the construction of mushroom (Agaricus bisporus) growing rooms at Pennsylvania farms, were evaluated as substrates for the green mold fungus (Trichoderma sp.). The frequency of isolating Trichoderma from infested hemlock boards was 19.3% and 3.8% before and after steam pasteurization, respectively, while the frequency from bald cypress (5%) was unaffected by pasteurization. A pre-crop topical treatment of wood with propiconazole [(Safetray P®) 8.4 mL per 100 L] or 1:20 copper-8- quinolinolate (PQ-57®) reduced green mold recovery by 80% and 75%, respectively, compared to an untreated, infested wood control. For several decades, routine post-crop steam pasteurization has been a component of sanitation programs at Pennsylvania farms. Using remote temperature sensors and data loggers, we monitored the pasteurization process at commercial farms. Generally, 6 h at 60°C (140°F) was considered adequate for the post-crop pasteurization process. During the 6-h pasteurization period, the air and compost temperatures were 66.4 (151.5°F) and 65.6°C (150°F), respectively. At one farm, Trichoderma was recovered from more than 7% of the wooden bed boards that had been in contact with infested mushroom compost after steaming for 20 h at 60°C.

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