杧果新病害露水斑病病原菌对杀菌剂敏感性测定

Sensitivity of Cladosporium cladosporioides causing mango new disease sooty blotch to Fungicides

【目的】探讨防治大田杧果露水斑病的有效方法,为了给该病的大田防治提供科学依据。【方法】采用生长速率法,通过初筛从30种杀菌剂中筛选出了11种抑菌率大于50%的杀菌剂,并进行了室内毒力测定。【结果】抑菌效果较好的是吡唑醚菌酯、多抗霉素B、多菌灵、苯醚甲环唑、咪酰胺、苯甲丙环唑(爱苗)、溴菌腈,EC50介于0.17~0.59 mg·L-1;其次是氟硅唑、丙环唑,EC50介于0.73~0.80 mg·L-1;较差的是肟菌·戊唑醇和戊唑醇,EC50接近于2 mg·L-1。从斜率值来看,该病菌对多菌灵、溴菌腈、苯醚甲环唑的敏感性较强。【结论】吡唑醚菌酯、多抗霉素B、多菌灵、溴菌腈、咪酰胺和苯醚甲环唑具有较好的应用潜力,值得进一步大田试验。

【Objective】To provide a scientific basis for controlling the disease in field.【Method】the sensitivity of the pathogen to fungicides was tested With the growth rate method.【Results】Eleven among 30 kinds of fungicides showed relatively better inhibitory effect with the inhibitory rate higher than 50% in the primary screening test. The toxicity test of 11 fungicides showed that Pyraclostrobin,Polyoxin B,Carbendazim,Difenoconazole,Prochloraz,Difenoconazole-Propiconazole and Bromothalonil had better in-hibitory effect with EC50 values between 0.17 mg·L-1and 0.59 mg·L-1. The EC50 values of Flusilazole and Propiconazole were between 0.73 mg·L-1and 0.80 mg·L-1. The inhibitory effect of Trifloxystrobin-Tebuconazole and Tebuconazole was poor with EC50 values close to 2 mg·L-1. C. cladosporioides was more sensitive to Carbendazim,Bromothalonil and Difenoconazole.【Conclusion】Pyraclostrobin,Polyoxin B,Carbendazim,Bromothalonil,Prochloraz and Difenoconazole would have good potential for controlling mango sooty blotch and be worth of a further test in field.