目前,各地生产的工农36型机动喷雾器,仅备直径3毫米与4毫米的单孔喷头两种。对防治稻麦基部病虫害效果较好,而对防治上部叶片和穗部病虫效果很差。有人曾经设想换用小皮管与4个喷孔的小喷头(粗细同手揿背负喷雾器)防治,效果较好,但由此 At present, the workers and peasants 36 models produced around the mobile sprayer, with only 3 mm and 4 mm diameter single-hole nozzle two. The prevention and control of pests and diseases of rice and wheat base is better, while the prevention and control of the upper leaves and ears of pests and diseases very poor. Someone once imagined switching to a small tube with a small nozzle with 4 holes (the same weight as a hand-held sprayer), which is better, but from this