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当前,在病虫害防治工作中,正在推广一种低量喷雾法。此法比过去推行的高量喷雾法具有省工、省水、防治及时、速度快等优点。1982年海阳县初次试用和推广,取得良好效果。如防治小麦蚜虫,我们采用552—丙型手动喷雾器,每亩用40%乐果乳剂25克、37.5克和50克,均兑水8斤稀释,喷药后24小时虫口减退率分别为97.9%、93.9%和96.8%;48小时虫口减退率分别为99%、99.5%和99.5%。每小时可防治4亩。采用高量喷雾,效果虽略高于低量喷雾,但每小时只能防治0.5亩左
At present, in the prevention and control of pests and diseases, a low-volume spraying method is being promoted. This law than the previous high-volume spray method has the labor-saving, water conservation, prevention and treatment of timely, fast and so on. Haiyang County in 1982 for the first time trial and promotion, and achieved good results. Such as the prevention and treatment of wheat aphids, we use 552-C type manual sprayer, 40% dimethoate Emulsion with 25 grams, 37.5 grams and 50 grams, all diluted 8 pounds of water, spraying 24 hours after the population decline was 97.9% , 93.9% and 96.8%, respectively; and the rate of 48-hour decline was 99%, 99.5% and 99.5% respectively. 4 mu per hour can be prevented. The use of high volume spray, the effect is slightly higher than the low amount of spray, but only 0.5 acres per hour left