螨类由于个体小,测定起来非常困难。通常,将生物体与化学药剂进行接触,即向植物材料喷洒药液或者在药液中浸渍,然后晾干,接上供试的生物体予以测定。这种技术只能对那些在被处理的植物表面来回走动以至于接触到药剂的个体有效,却不能反应出在处理时直接与药剂接触的效果。而且,一 Mites are very difficult to measure due to their small size. Usually, organisms are brought into contact with chemicals, that is, the plant material is sprayed with the drug solution or immersed in the drug solution, and then dried, and the test organism is used for the measurement. This technique works only for individuals moving back and forth on the surface of the plant being treated in contact with the agent but does not reflect the effect of direct contact with the agent at the time of treatment. And, one