Screening of bactericides to control bacterial blight caused by Xanthomonas oryzae pv.oryzae of plateau special Japonica rice cultivars"Chugeng"
[Aims]The aim of this study is to screen out the effective agents that can be used to control the bacterial blight of plateall special Japonica rice.[Methods]This study used antibacterial effect experiment to screen effective bactericides,and then evaluated their field control efficacy.[Results]The results showed that tetramycin,oxine-copper·tetramycin,zhongshengmycin and zinc thiazole had excellent inhibitory effect to Xanthomonas oryzae pv.oryzae,and their EC50 values were 2.694× 10-4,3.485 × 10-4,7.682× 10-4 and 3.983 × 10-3 mg/L,respectively.[Conclusions]The control effect of tetramycin was the best in laboratory test,with curative effect of 69.31％and preventive effect of 73.81％.In the field trials,the control effect of tetramycin on Nipponbare was 31.68％,and the yield increase rate was 94.73％.The control effect on Chugeng 53 was 44.38％,and the yield increase rate was 43.44％.
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