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卫辉市属棉铃虫高抗性区。1990年棉铃虫严重发生,久治不下。主要是:1.5月初降雨对棉铃虫羽化十分有利。据6月15日调查,百株卵1150粒,比常年高15～20倍;2.棉铃虫抗药性增强。据新乡县测定,棉铃虫对农药的抗性增加700～1000倍。这是长期单一使用一种农药所致。如初用甲胺磷时,15公斤水加50毫升防治棉铃虫,效果很好。但
Weihui City is a high resistance area of cotton bollworm. Helicoverpa armigera serious occurrence in 1990, long treatment no less. The main ones are: 1. Early January rainfall is very beneficial to the emergence of cotton bollworm. According to a survey on June 15, 1150 eggs per hundred were 15 to 20 times higher than normal years. 2. The resistance of cotton bollworm increased. According to the determination of Xinxiang County, cotton bollworm resistance to pesticides increased by 700 to 1000 times. This is caused by long-term single use of a pesticide. As early as methamidophos, 15 kg of water plus 50 ml control bollworm, the effect is very good. but