First, the promotion of poplar branches to trap cotton bollworm adults. The leaves of fresh poplar branches, every 6 to 8 branches tied into a high two meters, insert cotton fields in the evening, insert 10-15 per mu. When the adults of the cotton bollworm come out at night and smell the odor emitted by the poplar branch, they drill into the branch. Starting from the second day after the insertion, before each day of dawn, before the sun appeared, the branch took a set of plastic belts and pulled it out to shake it, collecting and hiding the moths for killing. After the killing, place the branches on the cotton line to prevent the sun from shining, and then insert the sticks at dusk. Change every 5-6 days and keep it until the end of August. Second, spraying calcium superphosphate solution to drive the spawning of cotton bollworm can greatly reduce the control area. In the spawning period of cotton bollworm, add 1%-2% superphosphate soaking solution in insecticide solution and mix it evenly with pesticides. Spray 6 lines each at intervals of 4 lines and spray every time. 50-70 kilograms of mixed liquid, so that the oxalic acid and phosphorus produced by the sprayed cotton plants are combined to form calcium oxalate, which causes it to lose the role of attracting Helicoverpa armigera, and drive the bollworms to concentrate on the non-sprayed cotton plants in order to concentrate the elimination. , can greatly reduce the workload. The soaked clear solution of superphosphate can also be sprayed separately, with the same insect repellent effect. Superphosphate can also harden the eggshell of the bollworm, causing the larvae to die without shelling. Spraying phosphorus also has an effect of increasing production. Third, artificial ovulation, insect catching. As the older larvae of H. armigera have strong resistance to drugs, their drug killing effect is poor. Two days after spraying, combined with field management, the larvae in the morning and rainy days are used for artificial capture. Fourth, choose the control of pesticides on the road. While using the above-mentioned prevention and control measures, field investigations should be conducted. If the 3rd generation of 100 bollworm larvae reaches 15 heads and the 4th generation bollworm larvae reach 8 to 10 heads, it is necessary to promptly spray and control the bollworms. At present, the following pesticides with good control effect can be selected: Spray 25% diafenthioni EC for 1000 times, or 35% for endosulfan EC for 1000-1500 times, or 20% for Methodic EC 1500 times, or 2.5% for Cifurer EC. 1500 times, or 2.5%, 1500 times that of EC, or 2,000 times that of 10%. These pesticides have good control effects on many species of insect pests such as Helicoverpa armigera, Blind mite, Aphids, Red spider, Corn borer, and Bridge insect. The above-mentioned pesticides should be alternately used for rotation, and one pesticide is preferably used only once to prevent the insects from developing drug resistance, so as to facilitate the improvement of the control effect.
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How to control the third and fourth generations of cotton bollworms in cotton fields
In the Huanghuai region of China, from the middle of July to the beginning of September, the third and fourth generations of cotton bollworms are endangered. Due to the increase in the percentage of interplanted cotton fields and the late development of this year, the second generation of Helicoverpa armigera has a larger amount of debris, and more rainfall in July and August. In addition, the insect-resistant performance of insect-resistant cotton in the middle and late stages is greatly reduced. According to the above analysis, in the Huanghuai region this year, the third and fourth generations of Helicoverpa armigera will occur moderately and occur in large numbers. From the author for many years to view: Therefore, most of the spring cotton plants have been aging, the amount of eggs bollworm is relatively small, the hatching rate is relatively low; and interplanting cotton fields, most of the later maturation, cotton plants are young, very The feeding rate of H. armigera was better, so the amount of eggs laid and hatching rate of eggs were 45.2% and 53.6% higher than that of pure cotton fields. Therefore, late-maturing cotton fields (most interplanting cotton fields and a few late-pure pure cotton fields) are the focus of third- and fourth-generation cotton bollworms.