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采用抑菌率法测定水稻内生巨大芽孢杆菌(Bacillus megaterium)菌株B196与25%戊唑醇乳油混配对水稻纹枯病菌的毒力,并测定其对水稻纹枯病的防治作用。结果表明:菌株B196与25%戊唑醇乳油以质量比为11.36∶1的混剂对抑制水稻纹枯病菌的生长有增效作用,其共毒系数(CTC)为185,以150mg/L的有效剂量进行盆栽防治,防效为77.72%;当田间有效施用量为46.88g a.i./hm2时,田间防治效果为74.71%。混剂在盆栽和田间对水稻纹枯病的防效均比单用菌株B196和25%戊唑醇乳油的高。
The inhibitory rate of Bacillus megaterium strain B196 and 25% tebuconazole EC were tested for their virulence against Rhizoctonia solani by inhibition culture method and the control effect on Rhizoctonia solani was determined. The results showed that the mixture of strain B196 and 25% tebuconazole at a mass ratio of 11.36:1 had a synergistic effect on inhibiting the growth of R. solani. The co-toxicity coefficient (CTC) of strain B196 with 185% was 150 mg / L Effective control was 77.72%. When the effective application rate was 46.88 g ai / hm2, the control effect in the field was 74.71%. Mixture in pot and field control of rice sheath blight than the single strain B196 and 25% tebuconazole EC high.