Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Trichoderma harzianum causing green mold disease on cultivated Ganoderma lucidum in Jilin Province, China.

Abstract

The fungus Ganoderma (Ganoderma lucidum), belonging to Ganodermataceae, has been extensively used as a traditional Chinese medicine and functional food. In 2014, green mould symptoms were observed in Jiaohe and Dunhua cities (Jilin, China) with incidence of over 30% on two cultivated G. lucidum areas, each approximately 2 ha. Both fruiting bodies (stipe and pileus) and mycelium tubes could be infected. Allochroic patches appeared on pileus leading to gradual rot, and produced a pale green mildew-like layer. Meanwhile, infected mediostrata turned golden orange into pale yellow and necrotic. Infected mycelium tubes produced white villous mycelia initially, and then produced green conidia, and were lastly covered by thick dark green mycelium layer. The severely infected mycelium tubes could not produce fruiting bodies. Based on morphological characteristics, molecular data (sequence analysis of the internal transcribed spacer regions, translation elongation factor-α, actin and calmodulin genes) and pathogenicity, the causal agent was identified as Trichoderma harzianum. This fungus was reported in mushroom production (Agaricus bisporus in America, Lentinula edodes in Japan, and Tremella fuciformis in China). This is thought to be the first report of Trichoderma harzianum causing green mould disease on cultivated G. lucidum in Jilin Province, China.