Light and temperature induced sporocarp formation of Phellinusweirii

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Abstract
Eight isolates of Phellinusweirii (Murr.) Gilb. (Poriaweirii (Murr.) Murr.), a serious pathogen of conifer roots in northwestern United States and southern British Columbia, formed sporocarps on malt agar after exposure to continuous near-ultraviolet light for 4 days at certain temperatures followed by incubation at normal laboratory temperature (22–24 °C) and lighting conditions (118 lx for 8–9 h). Isolates G7312 and T-55 formed sporocarps when cultures were placed in normal or inverted positions; other isolates produced sporocarps only in an inverted position. Effective light–temperature combinations varied among isolates. Of all isolates, only G7312 and T-55 were induced to form sporocarps by fluorescent white light.

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