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作物抗虫性的利用是农业防治的一个重要方向。应用抗虫性品种有效地压低甚至消灭害虫的为害,国内外都不乏其例。例如南大2419小麦在国内对红吸浆虫具有明显的抗虫力。在美国,1944年以前小麦受到瘿蚊[Phytiphaga destr-uctor(Say)]为害的株害率经常在50—100％。1944年以后California州的农民采用了抗虫品种“Big club43”,至第3年(1946年)小麦瘿蚊虫口密度即大为下
The use of crop insect resistance is an important direction of agricultural control. Application of insect-resistant varieties effectively reduce or eliminate the pest damage, there is no shortage of cases at home and abroad. For example, Nanda 2419 wheat in the country on the red sojae has significant insect resistance. In the United States, the rate of damage to wheat by Phytiphaga destr-uctor (Say) is often between 50 and 100% by 1944. After 1944, the farmers of California State adopted the insect-resistant variety “Big club43”. By the third year (1946), the population density of the mosquito was remarkably lower