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一个多世纪以来,植物育种者已知道许多作物品种对害虫的抗性存在着差异。虽然抗虫育种工作早已在多种作物中进行,但选育成功抗虫的推广品种则似在1940年以后。近年来由于提出了化学农药的残毒及环境污染问题,抗虫育种与其他生物防治方法一样受到了较大的注意。利用抗虫品种来防治害虫的显著优点是比较经济,且在害虫发生为害程度不等时均起作用,能不断地抑制害虫种群及其造成的为害。作物的抗虫性是与其感受性相对而言的。有人认为作物的抗虫性定义是:作物所具有的影响昆虫最终为害程度的遗传质的相对数量。在实际农业生
For more than a century, plant breeders have known differences in the resistance of many crop varieties to pests. Although insect-resistant breeding has long been carried out in a variety of crops, the promotion of successful insect-resistant varieties appears to be after 1940. In recent years, due to the proposed pesticide residues of pesticides and environmental pollution problems, insect resistance breeding and other biological control methods have received greater attention. The significant advantages of using insect-resistant varieties to control pests are more economical, and play a role in the pest damage range, can continue to inhibit the pest population and its damage. Insect resistance of crops is relative to their sensitivities. Some think that the definition of a crop’s resistance to insects is the relative amount of genetic material that the crop has on the degree of insect infestation. In the actual agricultural students