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近几年,临清市越来越多的棉农反映,抗虫棉抗虫性下降,田间棉铃虫多,为害加重,导致乱用药,打保险药的现象比较普遍,用药成本普遍提高,一般每公顷1 050～1 200元,多的1 500元以上。为了摸清抗虫棉田棉铃虫增多,为害加重的原因,笔者对本市及周边县市的抗虫棉进行了大量调查,结合近10年抗虫棉害虫动态变化研究的结果,综合分析认为,优质抗虫棉对各代棉铃虫的抗虫性无明显变化,抗虫性下降只是1种假象,田间棉铃虫增多是由多种因素造成的。现将原因及对策分析如下。
In recent years, more and more cotton farmers in Linqing City have reported that insect-resistant cotton has reduced insect resistance, more cotton bollworm in the field and worsened harm, leading to indiscriminate use of drugs and prevalence of insurance drugs. The cost of medicines generally increases, Hectare 1,050 to 1,200 yuan, more than 1,500 yuan more. In order to find out the reasons for the increase of cotton bollworm in insect-resistant cotton field and the aggravating of the damage, the author made a great deal of investigation on the insect-resistant cotton in this city and the surrounding counties. Combined with the research results of the dynamic change of insect- Insect-resistant cotton bollworm generation on behalf of no significant change in pest resistance, insect resistance decline is only one kind of illusion, the increase of cotton bollworm is caused by a variety of factors. Now the reasons and solutions are as follows.