Sensitivity Determination of Rice Sheath Blight Pathogen to Shenqinmycin in Northeast China

摘要

Rice sheath blight is one of the serious rice diseases causing economic losses worldwide.Shenqinmycin,a broad-spectrum microbial metabolite pesticide,inhibits plant pathogens.This study investigated the sensitivity of rice sheath blight pathogen to the biological pesticide by treating 45 strains isolated from three northeastern provinces with varying concentrations of Shenqinmycin.The effects on mycelial growth and sclerotial germination of the rice sheath blight pathogens were measured to determine the resistance levels.The results indicated that all tested strains were sensitive to Shenqinmycin,with EC₅₀ values for Rhizoctonia solani ranging from 0.0487 mg·L^-1 to 0.2348 mg·L^-1,and a sensitivity baseline of 0.1292 mg·L^-1.For Rhizoctonias oryzae-sativae,the EC₅₀ values ranged from 0.0517 mg·L^-1 to 0.1697 mg·L^-1,with a sensitivity baseline of 0.1163 mg·L^-1.Shenqinmycin had no effect on the sclerotial germination of either pathogen,suggesting its potential as an effective agent for controlling rice sheath blight.

关键词

Shenqinmycin / rice sheath blight / Rhizoctonia solani / Rhizoctonias oryzae-sativae / sensitivity