目前世界上昆虫约有一百多万种,其中害虫约有几千种,而显著为害作物的仅五百种左右。全世界害虫给农作物造成的损失约占产量的14%,经济损失每年超过十亿美元。培育和种植抗虫作物品种,可极大地减少害虫造成的损失。典型的例子是法国引入了抗葡萄根瘤蚜的美国品种,拯救了濒于毁灭的葡萄种植业和酿酒工业。农作物抗虫性的研究大致可分为三个时期。二 There are about one million kinds of insects in the world at present, of which there are about thousands of pests, while only about 500 are obviously harmful crops. Pests worldwide cause about 14% of crop losses and more than $ 1 billion a year in economic losses. Cultivating and planting insect-resistant crop varieties can greatly reduce the damage caused by pests. A typical example of this is the introduction of the American variety of grape-resistant phylloxera aphids in France, the rescue of the vinification-threatening grape-growing and wine-making industries. The study of crop pest resistance can be roughly divided into three periods. two