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采用菌丝生长速率法测定了4种常用杀菌剂对茭白胡麻斑病病菌的抑菌活性。供试药剂抑制该病菌菌丝生长的活性高低排序为咪鲜胺>戊唑醇>丙环唑>多菌灵,EC_(50)0.002 3~0.151 7 mg/L。安全性试验表明,连续施药3次后,25%咪鲜胺乳油处理对茭白具有较好的安全性,而25%丙环唑乳油处理明显减少孕茭数量和重量。进一步开展田间防效试验,使用25%咪鲜胺乳油12.50 g/667m~2(制剂用量)喷雾3次后,对茭白胡麻斑病防效达到77%以上,且防效随用药剂量增加而提高。
The mycelial growth rate method was used to determine the antibacterial activities of four commonly used bactericides against white spot disease. The order of the activity of the tested agents for inhibiting the mycelial growth of the bacterium was prochloraz> tebuconazole> propiconazole> carbendazim, EC 50 0.002 3-0.15177 mg / L. Safety tests showed that 25% prochloraz emulsions had a good safety profile when applied three times in succession, while 25% propiconazole EC significantly reduced the number and weight of pregnant rats. To further carry out the field efficacy test, using 25% prochloraz EC 12.50 g / 667m ~ 2 (dosage) spraying three times, the control effect on white spot disease of Abutilonulosa is over 77%, and the anti-efficacy increases with the dosage .