叶蝉散是继有机氯后的治稻虱特效农药。经连年重复施用,1983年后防效下降,用量剧增,重发因虽经药治仍遭减产。1984年,试用80 敌敌畏乳剂取代叶蝉散,取得良好防效。1984—1986年全县推广37万亩次以上,占应防治面积的61.8％,增产稻谷925万公斤以上,优于叶蝉散。其优点: 1.3虫兼治,增产效益高。对稻飞虱击 Leaf cicada powder is following the organic chlorine after treatment of pest-specific pesticides. After repeated years of repeated administration, after 1983 decreased control efficiency, the sharp increase in the amount, although the recurrence despite the drug was still cut. In 1984, try 80 enemy dichlorvos emulsion instead of leaf cicada, achieved good control effect. 1984-1986 the county to promote more than 37 acres, accounting for 61.8% of the area should be prevention and control, yield more than 9.25 million kilograms of rice, better than leaf cicada. Its advantages: 1.3 worm and cure, increase production efficiency. Right planthopper hit