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2002-2003年采用5%白粉宁烟剂,设计了6000、7500、9000、10500g/hm2用量,从白粉病发病初期开始第1次施药,每隔7d连续施药4次进行了药剂防治大棚西瓜和西葫芦白粉病的试验及示范。结果表明,第4次施药后第10天,5%白粉宁烟剂7500、9000g/hm2对西瓜白粉病的防效分别为94.78%、96.89%;对西葫芦白粉病的防效分别为91.37%、93.47%,均显著优于百菌清烟剂6000g/hm2之防效。示范结果表明,5%白粉宁烟剂9000g/hm2对西瓜白粉病的平均防效为95.10%,对西葫芦白粉病的平均防效为92.40%。
From 2002 to 2003, the dosage of 5% white powder was designed and the dosage of 6000, 7500, 9000 and 10 500 g / hm2 was designed. The first application was made from the early stage of powdery mildew. Experiment and Demonstration of Watermelon and Zucchini Powdery Mildew. The results showed that on the 10th day after the fourth application, the control effects of 5% white powder Ningqi 7500 and 9000 g / hm2 on watermelon powdery mildew were 94.78% and 96.89%, respectively. The control effects on Z. gourd powdery mildew were 91.37% , 93.47%, were significantly better than chlorothalonil 6000g / hm2 control effect. Demonstration results show that the average control effect of 5% white powder Ningxia 9000g / hm2 on watermelon powdery mildew was 95.10%, and the average control effect against zucchini powdery mildew was 92.40%.