四种无公害药剂防治南瓜白粉病试验初报

为筛选防治南瓜白粉病安全有效的药剂,选用12.5%腈菌唑乳油、4%四氟醚唑、20%氟硅唑乳油和15%三唑酮可湿性粉剂4种低毒药剂,采用叶盘沾药法和小株喷雾法分别对南瓜白粉病进行了室内抑菌活性测定。结果表明:采用叶盘沾药法,4%四氟醚唑稀释1 000倍液和15%三唑酮可湿性粉剂稀释500倍液相对防效最高,分别为96.34%和90.73%;采用小株喷雾法施药14d后,12.5%腈菌唑乳油、20%氟硅唑乳油和15%三唑酮可湿性粉剂对南瓜白粉病的相对防效均大于80%,4%四氟醚唑的相对防效也在75%以上。

Preliminary Study on the Control Effect of Four Kinds of Pollution-free Agricultural Chemicals on Powdery Mildew of Pumpkin

In order to screen the effective agricultural chemicals for preventing pumpkin powdery mildew, taking four low toxic including 12. 5% myclobutanil missible oil, 4% tetraconazole, 20% flusilazole missible oil and 15 % triadimefon wettable powders as test agricultural chemicals,leaf-dish with medicine and small plant spray method were used to determine the antibacterial activity indoor, respectively. The results showed that, 4 % tet- raconazole diluted 1 000 times and 15 % triadimefon wettabte powders diluted 500 times had higher effect than control by leaf-dish with medicine,the control effect were 96.34% and 90.73% respectively. After small plant spraying for 14 days, 12.5% myclobutanil missible oil,20% flusilazole missible oil and 15% triadimefon wetta- ble powders inhibited pumpkin powdery mildew obviously,the relative effect was more than 80% ,the relative effect of 4% tetraconazole was more than 75%.