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近年来,因棉叶螨对棉花持续严重为害,已给垦区棉花生产造成了很大的威胁。当前,生产上采用3911拌种来压低棉花苗期叶螨的虫口密度。这项措施,在棉花叶螨防治乃至棉花病虫综防工作中,发挥了很大的作用,并成为棉花生产的一个重要环节。但在生产防治实践中,常常会遇到诸如3911拌种的持效期有多长的问题。在3911持效期内,棉苗是“毒苗”,虽然此时有叶螨在棉苗上取食活动,但最终因“食毒死亡”而不能继续生存、繁殖。若在此时进行大面积的喷药防治,就会造成不必要的人力和物力的浪费,而盲目推迟化防时间,有时又会因防治延误而造成经济损失。针对这个问题,我们以142团4个营,7个连队的部分棉田作基地,开展了3911拌种对棉叶螨持效期预测的调研.
In recent years, cotton spider mites sustained serious damage to cotton, cotton reclamation has caused a great threat. At present, the production of 3911 seed dressing to reduce cotton seedling spider mite population density. This measure has played a great role in the prevention and control of cotton spider mites and even cotton pest and disease and has become an important link in cotton production. However, in the practice of prevention and control of production, it is often encountered such as how long the 3911 seed dressing has a persistence period. In the 3911 persistence period, cotton seedlings are “poisonous”, although spider mites feed on cotton seedlings at this time, but eventually because of “food poisoning” and can not continue to survive and reproduce. If a large area of spray prevention and treatment is to be carried out at this time, unnecessary waste of manpower and material resources will be caused. Blindly delay of the anti-guarding time will sometimes result in economic losses due to prevention and control delays. In response to this problem, we conducted a study on the prediction of the duration of cotton spider mite 3911 seed dressing on the base of some cotton fields of 4 battalions and 4 companies of 7 groups.