拟除虫茬酯类农药是一类对光稳定,残效期长,活性高,对人畜安全,可防治多种害虫的杀虫剂。近年来,棉花、果树蔬菜均单一连续使用防治害虫。照此下去,要不了很长时间,害虫就会对拟除虫菊酯类产生抗药性。我国山地的主要棉区应用拟除虫菊酯类药剂防治棉蚜,仅3年棉蚜对其抗药性高达16万倍。说明害虫对拟除虫菊酯类产生抗药性的速发是很快的。如果使用不合理,几年就会被淘汰。所以应积极采取措施,合理用药,以克服和延缓害虫对拟除虫菊酯类杀虫剂抗药性的产生。(1)危害损失达到经济阈限以上才能进行化防。而且要注意施药均匀周到。因 Pest control pesticides to be pest control is a class of light stability, long residual period, high activity, safe for humans and animals, can control a variety of pests insecticide. In recent years, cotton, fruit trees and vegetables are a single continuous use to control pests. Go on like this, or for a long time, the pest will produce pyrethroid resistance. Pyrethroid insecticides are the main cotton in mountainous areas of China. Cotton aphid is only 160,000 times more resistant to cotton aphid than 3 years old. Indicating that pests on pyrethroids resistant to the rapid onset is very fast. If you use unreasonable, will be eliminated in a few years. Therefore, we should take active measures to rationalize drug use in order to overcome and delay the emergence of resistance to pyrethroid insecticides by pests. (1) Hazard damage can not be achieved until the economic threshold is reached. And pay attention to spraying evenly. because