Volume 12 Part 2 Article 79: A Mortierella Species (Zygomycetes) Associated with Cultivation of Agaricus brunnescens

Volume 12 Part 2 Article 79
Year 1989
Title: A Mortierella Species (Zygomycetes) Associated with Cultivation of Agaricus brunnescens
Authors: D.A. Betterley and M.F. Brown

Abstract:

Recent outbreaks of a rapidly spreading mold on the compost surface during spawn run period have caused concern on several mushroom farms in the eastern U.S. Extensive areas can be covered by a greyish-white mycelium which then sporulates heavily, giving the compost a granular white-grey appearance. This fungus is identified as Mortierella reticulata van Tieghem and Le Monnier (Zygomycetes: Mucorales: Mortierellaceae). Mortierella species have not been reported in previous surveys of mushroom compost mycoflora (Fergus, 1964, 1978; Eicker, 1977, 1980).

The appearance of this mold coincides with nearby loading and hauling of old spent compost piles, or improper removal or sanitation of spent compost in mushroom houses. Yield reductions have been noted in some rooms affected, although other diseases are also present. This study includes compost inoculations to investigate possible effects on mushroom mycelium and sporophores.

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