In the prevention and treatment technology bollworm, cotton bollworm improve the efficacy is reduced investment, cost effective method of reducing. The following are several methods used Insecticides cotton bollworm presentation.
1. The time of spraying insecticides The hatching pattern of cotton bollworms is that the egg head is white, two days yellow, three days black, and hatching in four days. The second day after hatching, the growth point was harmed, and on the fourth day, the young bud was damaged. Most of the cotton bollworms are active in the morning from 8 to 11 am and after 4 pm, and there is very little activity during the high temperature period. The appropriate period of prevention and treatment should be applied after 8 to 11 am and 4 pm after the peak of hatching until most of the eggs become black or hatched. Avoid high temperature application, high temperature application is easy to decompose, not only the operator is easy to poison, but also poor efficacy.
2. When the cotton bollworm is spawning, it is usually produced on the top of the cotton plant, on the young leaves of the top of the fruit branch, on the bud and on the stalk. The focus should be sprayed on the top of the cotton plant and on the tender tips, buds and stalks of the fruit branches.
3, the concentration of the drug according to the instructions to prepare the concentration of pesticides, can not be arbitrarily increased or decreased. Increasing the concentration tends to cause phytotoxicity in cotton plants, and reducing the concentration will reduce the efficacy. If the amount of liquid medicine is small, the cotton plant will be sprayed unevenly, and the insect control effect will be poor. When controlling the second-generation cotton bollworm, the amount of liquid per acre should not be less than 40 kg. When controlling the third and fourth generations of cotton bollworm, the amount of liquid per acre is 80-100 kg. All the cotton plants are evenly treated and the effect is good.
4. Use different pesticides alternately. Do not use a pesticide continuously to prevent cotton bollworm from developing resistance to the drug.
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