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害虫对某种农药产生抗性,已是目前生产上一大问题,而且此抗性在向严重发展。例如溴氰菊酯从1980年至1984年,对棉蚜、棉铃虫是一种“特效药”群众称“一扫光”,可是到了1985年防治伏蚜效果就明显下降了,近年来所有的拟除虫菊酯类农药都失去了它应有的威力。之所以如此快产生抗性分析其原因主要有: 1.单一使用某种杀虫剂(溴氰菊酯或速灭杀丁等),而不交替使用不同杀虫机制的杀虫剂。2.特殊的天气,特别是温度的变化。1985年春天拟除虫菊酯除治苗蚜还有相当高的效果,因为此时期的气温是20℃左右,而伏蚜防治是7月,当时气温30℃以上,而拟除虫菊酯对昆虫的毒性是在一
Pest resistance to certain pesticides is already a major issue in the current production and the development of this resistance is serious. For example, deltamethrin from 1980 to 1984, the cotton aphid, cotton bollworm is a “cure” masses called “swept away the light”, but by 1985 the effect of prevention and control of aphids significantly decreased in recent years, all Pyrethroid pesticides have lost its due power. The reason why resistance analysis is so fast is mainly due to the following reasons: 1. Insecticides that use a single insecticide (deltamethrin, trimethoprim, etc.) singly without alternating insecticidal mechanisms. 2. Special weather, especially temperature changes. The pyrethroid in the spring of 1985 except for the treatment of seedling aphid there is a very high effect, because the temperature during this period is about 20 ℃, and the prevention and treatment of aphids is July, when the temperature is above 30 ℃, and pyrethroid insects toxic In a