Rice blast is the most important and destructive crop disease in rice paddies and poses a continued threat to the production of rice (Rossman et al, 1990;Khush, 2005;Wang et al, 2018;Chen et al, 2019).Biological control is given increasing attentions on the control of rice blast for its outstanding advantages, such as safety, low-cost, and sustainability and environmentallyfriendly attributes.