First report of bacterial blotch disease caused by Burkholderia gladioli in Grifola frondosa from China

Abstract

Grifola frondosa has been regarded as healthy food resources for its potentially nutraceutical and pharmaceutical values for centuries. During 2023, a bacterial blotch disease with a 40 % incidence rate was observed in G. frondosa in Qingyuan County, Zhejiang Province, China. The strain isolated from symptomatic tissues was identified as Burkholderia gladioli through a combination of morphological characteristics, biochemical features, and phylogenetic analysis. This is the first documented case of B. gladioli causing bacterial blotch in G. frondosa in China. This research will deepen the understanding and provide a reference for available management of this disease in field.