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为了解瑞拉菌素对小麦白粉病的防治效果，用1.2%瑞拉菌素水乳剂在小麦田间进行不同喷施浓度、时间和次数试验。结果表明，在3个1.2%瑞拉菌素水乳剂喷施浓度（稀释600倍、700倍和800倍）中，600倍稀释液对小麦白粉病防治效果最好，防效达77.6%，保产作用为9.9%。从喷药次数看，用650倍的稀释液在小麦抽穗和扬花期喷施两次的防病效果最好，防效达74.4%，保产作用为10%；若喷施一次时，扬花期喷施的效果优于抽穗期喷施。

英文摘要:

To understand the effects of spraying diluted solution of zuelaemycin 1.2% SL fluid on controlling powdery mildew in wheat, field experiment was conducted with spraying at different time, different dilutions and times. Results showed that among the three dilutions of 600,700 and 800 times, better control effect was achieved by the 600 times dilution with controlling effect of 77.6% and protective effect of 9.9%. Spraying two times of 650 times dilution at before heading and after anthesis obtained the best controlling effect, with the controlling effect of 74.4% and protective effect of 10%. If spraying once, spraying at after anthesis was better than that at before heading. The result suggested that zuelaemycin 1.2% SL could effectively control mildew disease in wheat.

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