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1.以菌治虫以菌治虫就是利用害虫的致病微生物来防治害虫。(1)用细菌农药BT防治菜青虫、棉铃虫等的幼虫防治菜青虫可在卵孵盛期开始喷药每亩(1亩=667平方米,下同)用BT可湿性粉剂27～30克或BT乳剂100～150毫升,7天后再喷1次,防治效果95%以上;防治棉铃虫可在2～3代卵孵盛期开始喷药,隔3～4天喷1次,连续喷2～3次每次每亩用BT可湿性粉剂50克或BT乳剂200毫升,防治效果
1. To bacteria to kill pests to kill pests is the use of harmful microorganisms to control pests pests. (1) Prevention and control of larvae of Pieris rapae and Helicoverpa armigera by bacterial pesticide BT Pieris rapae can be sprayed at the peak of egg hatching. Each mu (1 mu = 667 m2, the same below) can be sprayed with 27-30 g of BT WP Or BT emulsion 100 to 150 ml, 7 days and then spray 1, the control effect of more than 95%; control of cotton bollworm in 2 to 3 generations of eggs hatch start spray, every 3 to 4 days spray 1, continuous spray 2 ~ 3 times per acre BT wettable powder or 50 grams of BT emulsion 200 ml, control effect