芒果炭疽病菌对噻菌灵的敏感性测定

摘要

为研究芒果炭疽病菌对噻菌灵的敏感性，在未使用或较少使用苯并咪唑类杀菌剂的芒果种植区采集获得83株单孢菌株，通过生长速率法测定其对噻菌灵的敏感性，并以其EC50平均值(1.1540±0.1641) mg/L作为敏感性基线，评价了120株芒果炭疽菌株对噻菌灵的敏感性。结果表明：菌株对噻菌灵的EC50值为0.18～9.23 mg/L，平均值为(1.8906±1.6322) mg/L，最大EC50值是最小EC50值的51.3倍，共检测到6株低抗菌株，占总菌株的5.0%。不同地区和采集部位的芒果炭疽菌株对噻菌灵的敏感性不同。芒果炭疽病菌对噻菌灵具有较高的敏感性，噻菌灵在生产上仍具有较高的使用价值，但不同菌株的敏感性有一定差异性，存在潜在的抗性风险。%The sensitivity of 83 mango anthracnose isolates from the region where benzimidazole fungicides were fewer used were determined by growth rate method. The mean EC50 values (1.1540±0.1641) mg/L could be used as baseline-sensitivity of mango anthracnose to thiabendazole, then the sensitivities of 120 mango anthracnose isolates were determined. The results showed that the EC50 values of isolates to thiabendazole ranged from 0.18 to 9.23 mg/L, and the mean EC50value was (1.8906±1.6322) mg/L, the maximum EC50 value was 51.3 times bigger than the minimum EC50 value. Six isolates (5.0%) showed low-level resistance to thiabendazole. The sensitivities of mango anthracnose in different regions and sampling sites were different. Thiabendazole had a high sensitivity to mango anthracnose and could be used in agricultural production.