At the moment, cotton production areas in Shandong and Hebei have gradually entered the spring planting season. For most cotton farmers, the most troublesome thing for them is the occurrence of cotton bollworm disease. The occurrence of cotton bollworm will cause a large area of ​​cotton seedlings to die, which will lead to the reduction or even the production of cotton farmers. How can we effectively prevent the occurrence of cotton bollworm? After years of experiments and practices, the author integrated the experience of the local people in the prevention and control of cotton bollworms, explored and summed up six “tricks†for the prevention and treatment of cotton bollworms, namely, induce, drive, wipe, spray, catch, and clear. Practice has proved that all those who strictly follow this "Six Characters" to control the cotton bollworm, its control efficiency is above 95%.
Lure: The poplar branches are inserted to trap and kill adult cotton bollworms. The specific method is that in the second, third and fourth generations of adults of cotton bollworm, the twigs of each 667 square meters of cotton fields are placed into the branches to induce more than 10 bundles of insects. At dawn, use a plastic bag to cover Yang Zhi, hand-pinch and kill the moth, change the Yang Zhi ban every 5 days, and burn the old twigs at the same time in order to eliminate the eggs laid on them.
Drive: The calcium superphosphate solution is sprayed to repel adult bollworm adults. According to studies, cotton glands with tender tips can secrete oxalic acid and formic acid and induce adult oviposition of cotton bollworm adults. The use of 1% superphosphate solution sprayed cotton, can make oxalic acid into calcium oxalate, the amount of eggs can be reduced by 33.3-73.4%. This method serves two purposes, both to repellent bollworm spawning, but also make up the application of phosphate fertilizer. The specific method is: During the spawning of cotton bollworm, superphosphate is soaked in water at a rate of 1% for a day and night, and the upper clear liquid is sprayed on the cotton field and sprayed once every 2-3 days.
Wiping: Artificially obliterating eggs of the bollworm to reduce the amount of eggs. Can be combined with the pruning of cotton, one is to occlude the eggs on the cotton plant; the second is to bring the eggs of the axillary buds, leaf branches, etc. out of the field.
Spraying: Use chemical spray to kill young larvae of cotton bollworm. When 100 cotton plants have reached 40 eggs or more than 100 newly hatched larvae have reached 5 or more, chemical control should be carried out immediately. With 25% Ekass EC 800 times solution, it sprays at the spawning stage of cotton bollworm, and the control effect is more than 95.6%; with 24% Wanling agent 1000 times, it sprays during the procreative period of spawning, and the control effect is reached. 91.7%; using 100-200 times of BT emulsion, spraying during the spawning period, the efficacy is above 80%. Chemical pesticides were sprayed once every 5-7 days, and sprayed 1-2 times per generation; biological pesticides were sprayed once every 3-4 days. Each time a total of 3 sprays. And pay attention to rotation medication.
Catching: killing old larvae manually. The older larvae that remained after chemical control were resistant to insects, and most of them had already entered the buds, flowers, and bells. It was difficult to effectively control them with pesticides. It is better to use artificial killing and rule of law. When the number of debris is small, it can be combined with cotton field pruning and killing; if there are a large number of debris, focus on human assault.
Qing: That is, clean up the pastoral area, cultivator eradication. To change the existing farming system, the cotton field should be removed from the cottonwood in a timely manner after the fall, and the autumn plowing and winter irrigation should be carried out to destroy the overwintering environment of the bollworm and reduce the overwintering base number. After the wheat is harvested, the cotton field should be irrigated in time to reduce pests.
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