The toxicities of Jinggangmycin A and boscalid, as well as their mixture, against the pathogen of rice sheath blight Rhizoctonia solani were investigated by using the method of inhibition mycelial growth rate. The results showed that EC50 of Jinggangmycin A and boscalid were 114.0672 mg/L and 0.0569 mg/L, respectively, and EC50 of mixture of Jinggangmycin A and boscalid at rate of 1:100, 1:200, 1:300, and 1:400 were 5.5814 mg/L, 6.8186 mg/L, 5.2672 mg/L and 2.7772 mg/L, respectively. Co-toxicity index of these mix rates were 0.9716, 1.5182, 2.8210, and 6.8325, which means that almost all of the mixtures exhibited synergy effect, except the mix rate of 1∶100 showing additive effect. Boscalid showed little inhibition effect against the bacterium H158 at the concentration as high as 1.6 mg/ml. H158 can only be inhabited by Jinggangmycin A at higher concentration, however mixture of Jinggangmycin A and boscalid showed little inhibition effect against H158, the control efficient of which can be enhanced to more than 90%.
ZHOU Ming-Yun-1, 2 , WANG Ai-Juan-3, LIU Lian-Meng-2, HUANG Shi-Wen-2*
. Synergistic Effects of Potential Biocontrol Bacterium H158 Mixed with Fungicides Against the Pathogen of Rice Sheath Blight Rhizoctonia solani[J]. China Rice, 2015
, 21(1)
: 60
-65
.
DOI: 10.3969/j.issn.1006-8082.2015.01.014
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