Control of the third Generation Helicoverpa armigera in growing Cotton

First, artificial collection of eggs to kill insects. Since most of the third generation cotton bollworms are in the flowers and bolls of insect-resistant cotton, the abortive flowers should be removed in time and the insects should be killed artificially in other cotton fields.

Second, grasp the appropriate period of prevention and control and use drugs scientifically.

1. The insecticides were used in time when there were 10 larvae of less than 3 instar larvae in 100 insect-resistant cotton fields, 40 eggs of 100 plants in non-insect-resistant cotton and other crop fields or 5 larvae of 100 young larvae. The medicament can be selected as follows: (1) 40% propiophos EC 140ml per mu and 70 kg spray with water. (2) 2.5% cyhalothrin EC 50 ml mixed with 70 kg water spray.

two。 The 100 plants in the vegetable field have 20 mi 30 eggs, which can be sprayed with 75 ml of 1% methylvitamin saline dispersible granules or 200 times of Bacillus thuringiensis preparation, or 2500 times of 1.8% avermectin or 5% flurodinourea EC. The use of highly toxic, highly toxic and highly residual pesticides is strictly prohibited.

Matters needing attention:

The main results are as follows: 1. Due to the tall cotton plant during the control period of the third generation cotton bollworm, attention should be paid to uniform and thoughtful spraying, and the amount of liquid used per mu should not be less than 70kg.

2. To do a good job in the control of cotton bollworm outside the cotton field, the use of highly toxic, highly toxic and high residual pesticides on vegetables is strictly prohibited.

3. Spraying time is chosen before 10:00 or after 4pm. It is forbidden to spray at noon to prevent pesticide poisoning.

4. Check the control effect in time. If the prevention effect is poor after spraying or if it meets rain within 6 hours after spraying, make up spraying in time.