Fungicide Sensitivity and Characterization of Cobweb Disease on a Pleurotus eryngii Mushroom Crop Caused by Cladobotryum mycophilum

• Main Authors: Min Keun Kim, Su Won Seuk, Young Han Lee, Hye Ran Kim, Kye Man Cho
• Format: Article
• Language: English
• Published: Hanrimwon Publishing Company 2014-03-01
• Series: The Plant Pathology Journal
• Subjects: Cladobotryum mycophilum; cobweb disease; fungal pathogen; fungicides; Pleurotus eryngii
• Online Access: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4174831/

In 2009–2010, unusual symptoms were observed on Pleurotus eryngii grown in mushroom farms in Gyeongnam Province, Republic of Korea. One of the main symptoms was a cobweb-like growth of fungal mycelia over the surface of the mushroom. The colonies on the surface rapidly overwhelmed the mushrooms and developed several spores within 3–4 days. The colonized surface turned pale brown or yellow. The fruit body eventually turned dark brown and became rancid. Koch’s postulates were completed by spraying and spotting using isolated strains. The phylogenetic tree obtained from the internal transcribed spacer sequence analysis showed that the isolated fungal pathogen corresponded to Cladobotryum mycophilum (99.5%). In the fungicide sensitivity tests, the ED₅₀ values for the isolate with respect to benomyl and carbendazim were from 0.29 to 0.31 ppm. Benzimidazole fungicides were most effective against C. mycophilum, a causal agent of cobweb disease in P. eryngii.