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粉尘法就是利用具有一定细度和形状的固态粉粒在空中的“飘翔效应”，使农药粉粒在棚室空间形成飘尘，并能在空中飘浮相当长的时间，由于粉尘在空中的布朗氏运动原理，粉尘能在空中作全方位运动，因而能在株冠层中很好的扩散、穿透，从而在作物各部位产生较均匀的沉积分布。１９９２－１９９３年我们对粉尘法及粉尘剂经过两年的试验研究，结果表明粉尘法具有良好的实际应用效果，是取代常规喷雾和烟雾法的一种比较理想的保护地施药新技术。
Dust method is the use of a certain degree of fineness and shape of solid particles in the air “floating effect” to make pesticide particles in the greenhouse space to form floating dust, and can float in the air for a long time, due to dust in the sky Brown ’S motion principle, the dust can make all-around motion in the air and thus can well diffuse and penetrate in the canopy layer to produce a more uniform distribution of the sediment in all parts of the crop. In 1992-1993, after two years of experiments on the dust method and the dusting agent, the results show that the dust method has a good practical application effect and is an ideal new protective technology for application of the conventional spray and smoke method.