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近年来,由于大量使用化学农药,加之不少花农缺乏农药使用基本知识、用药不当,导致抗药性的花木害虫种类越来越多,且抗性程度越来越高。据调查,花木上常见的红蜘蛛、蚜虫、蚧壳虫、粉虱等,均已产生了较强的抗药性,给花卉生产造成了很大损失。如何克服花木害虫的抗药性呢?1.轮换用药。不要长期单一使用某种农药防治某种害虫,这样就可以切断害虫种群中抗药性种群的形成过程。轮换使用的品种应尽可能选用作用机制不同的农药。如有机磷农药、拟除虫菊酯类农药、氨基甲酸酯类农药、有机氮农药、生物制剂类农药等,杀虫作用机制各不相同,可交替轮换使用。同一类的农药品种轮换使用宜慎重,因害虫易获得交互抗性,即对某种农药产生抗性后,对和该种农药同类的其它品种也会产生抗性。如抗乐果的菊蚜,同样对敌敌畏、敌百虫等也产生抗性。
In recent years, due to extensive use of chemical pesticides, coupled with many farmers lack the basic knowledge of pesticide use, improper use of drugs, leading to more and more species of pests and resistance, and the degree of resistance is getting higher and higher. According to the survey, the common spider mite, aphids, scale insects, whiteflies and other flowers, have produced a strong resistance, resulting in a huge loss of flower production. How to overcome the resistance of flowers and pests do? 1 rotation medication. Do not long-term single use of a pesticide to control certain pests, so you can cut off the formation of drug-resistant pests population. As far as possible, the varieties used for rotation should use pesticides with different mechanisms of action. Such as organophosphorus pesticides, pyrethroid pesticides, carbamate pesticides, organic nitrogen pesticides, biological agents such as pesticides, insecticidal mechanism of action vary, can be used alternately. The same type of pesticide rotation should be used carefully, because pests are easily cross-resistant, that is, after a certain pesticide resistance, and other varieties of the same type of pesticide resistance. Such as anti-dimethoate aphid, the same dichlorvos, trichlorfon also produce resistance.