Airborne Fungal Spores at Lumber Seasoning Yards in the Lower Ottawa Valley

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Abstract
Airborne fungal spores were trapped at three lumber storage locations in the lower Ottawa Valley by exposing petri dishes containing malt agar medium. The fungal colonies developing were counted and identified. Highest counts from morning exposures were obtained at Braeside in June, at Ottawa in July, and at Thurso in September. Afternoon exposures, made only in Ottawa, yielded generally higher counts than morning exposures. While dark colonies predominated at Ottawa and Braeside sites, where mainly softwood lumber was stored, hyaline and white colonies prevailed at the hardwood lumber yard at Thurso. The three most common fungi at the Ottawa and Braeside locations were Alternaria spp., Aureobasidiumpullulons, and Penicillium spp. At the Thurso site, Alternaria spp., Trichodermaviride, and Penicilliumspp. were most numerous. A Cladosporium sp., a Graphium sp., and an Alternaria sp., caused considerable staining on the surface of white birch blocks in laboratory tests.

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