First report of Trichoderma longibrachiatum causing green mold disease on Ganoderma lingzhi.
Ganoderma lingzhi is a valuable herbal medicine in Asia. In 2015, the planting area of G. lingzhi was 100 million square meters in China. In the spring of 2015, rot disease symptoms were observed on the fruiting bodies of G. lingzhi with incidence of over 40% at the farm of Fushun city, Liaoning province, China. The main symptoms were spider-reticulated white mycelium under the G. lingzhi cap and green rot on the stipe. The disease was most severe during the sporulation of G. lingzhi. Based on morphological characteristics, molecular data (sequence analyses of the rDNA internal transcribed spacer region and TEF1-α gene region) and pathogenicity assay, the causal agent was identified as Trichoderma longibrachiatum. This fungus was reported to cause mould diseases in oyster mushroom. This is thought to be the first report of T. longibrachiatum causing green rot disease on G. lingzhi.