First report of Sporobolomyces symmetricus induced red spot disease of Pleurotus eryngii in China.
In January of 2009, red spot disease on cultivated P. eryngii was observed in several workshops of mushroom producing factories located in Fangshan District, Beijing, China. Symptoms of this disease began as orange red spots 2 to 4 cm in diameter on the surface of stipes near pilei. The spots did not arise from wounding, and growth of the affected mushrooms halted. Commercial losses for these factories were estimated at 10 to 15%. Based on morphological and phenotypic characteristics, molecular analyses and pathogenicity tests, the causal agent was identified as S. symmetricus. This is thought to be the first report of S. symmetricus-induced red spot disease of P. eryngii in China.