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1.喷粉法 使用低浓度粉剂,用手摇或机动喷粉器喷施,不需用水,工效比喷雾高10多倍。适于在缺水干旱地区使用及防治暴发性病虫害,如蝗虫、粘虫等。喷粉时间一般在早晚有露水时,顺风进行(风速在1—2级内)。根据防治对象,选择喷药量,一般每亩地用药粉为1.5—2.5公斤,以值株表面覆盖一层极薄药粉为宜。若植株表面发白,则药量过大。喷粉后1天内
1. Dusting method using low concentrations of powder, spray gun by hand or motorized, without water, the efficiency of more than 10 times higher than the spray. Suitable for use in dry and drought-prone areas and prevent outbreaks of pests and diseases, such as locusts, armyworms and so on. Dusting time generally in the morning and evening dew, the wind (wind speed in the 1-2 level). According to the prevention and treatment of objects, choose the amount of spraying, the general use of powder per acre for the 1.5-2.5 kg, the value of plant surface covered with a layer of very thin powder is appropriate. If the plant surface is white, the dose is too large. Within 1 day after dusting