农药杀不死病虫。一种可能是选配的农药与所杀的病虫品种不对路,另一种可能就是病虫对农药产生了抗药性。病虫时农药产生抗性的现象虽然普遍存在,但并不可怕,只要我们采取有针对性的防治措施,是可以有效地提高农药的应用效率的。首先,要选准对路农药。有些病虫对某些农药已经产生了抗药牲的,切忌重复使用。由于各地用药的习惯不一,产生的抗性也表现不一,应 Pesticides kill insects and insects. One possibility is that an optional pesticide is not on the way to the species of pests killed. Another possibility is that pests and diseases develop resistance to pesticides. Pest and disease when pests produce resistance phenomenon although ubiquitous, but not terrible, as long as we take targeted prevention and control measures can effectively improve the efficiency of the application of pesticides. First of all, to choose the right path pesticides. Some pests and insects on some of the pesticides have produced resistance, should not be reused. Due to the different habit of medication, the resistance also showed different, should