The Prevention and Control Techniques of Pests in Late Stage of Cotton Growth

In recent years, with the widespread use of insect-resistant cotton, climate warming, and the gradual expansion of greenhouse greenhouse vegetable area, the damage area and damage degree of Bemisia tabaci in the later stage of cotton field has been increasing year by year, and the late growth, yield and quality of cotton. Has a greater impact. Since 2001, for several consecutive years in Binzhou, Dongying, Dezhou, Liaocheng and other major cotton districts in northern Shandong, the occurrence of Bemisia tabaci in the cotton field is relatively large, causing serious damage. According to a survey conducted in recent years, the amount of worms in B. tabaci in cotton fields increased significantly in the middle and late August, and the amount of worms peaked in the middle and early September. Ecological control: According to the characteristics of whitening of whiteflies, white plates can be trapped and killed in the cotton fields. The specific method is to use a yellow material made of a suitable size of the yellow board, and apply oil on the board, usually 7 to 10 days smear 1, can greatly reduce the density of cotton field insect population. Timely pruning and pruning, remove the invalid old leaves at the bottom of the cotton, bring the waste branches and leaves that contain pests out of the cotton field, and dig deep into the pit to reduce the number of pests in the cotton field. At the same time, we must pay attention to the timely removal of weeds inside and outside the cotton field and the cultivation of vegetables such as gourd, gourd, and squash in the vicinity of the cotton field so as to eliminate the intermediate host of the cotton field pests such as Bemisia tabaci. Pesticide control: When the upper, middle and lower leaves of cotton have 16 to 20 nymphs on the average leaf (reference index), 10% imidacloprid 1500-2000 times solution, or 25% puroprofen 1000-1500 times solution, or 25% cotton insect tyrants 1500 times liquid spraying control, liquid spray to the back of the leaf, sprayed once every 10 days or so. After the greenhouse crop is harvested, the shed can be smoked in time to completely eliminate the insect source.

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