一、棉种的冬晒冬冻 严冬时节晒、冻棉种,可以杀灭潜入棉籽中越冬的红铃虫幼虫70％左右。晒、冻期间如能对贮种场所和贮种器具进行一次灭虫,效果可达90％以上。同时,晒、冻还有灭菌作用,可以减轻苗期病害。操作上要掌握先晒后冻的原则,以免棉种因为水分含量较高发生结冰现象。在元至2月,选择1—2个晴天先晒,然后再日晒 First, the cotton seed winter sun winter frozen winter season sun, frozen cotton species, you can kill infested cottonseed red beetle larvae wintering about 70%. During drying and freezing, if the insecticide can be decontaminated once and for more than 90% of the storage places and stocking instruments. At the same time, drying, freezing and sterilization, can reduce the disease at seedling stage. Operation to master the principle of drying after the sun, so cotton species because of the high water content freezing phenomenon. In Yuan to February, choose 1-2 sunny days before the sun, and then the sun