1. Pruning: According to the survey, pruning once in the second generation of cotton bollworm at the right time will reduce the number of eggs per 100 eggs by 40%-60%. In the second-generation cotton bollworm eradication cotton field, field eggs, insects inventory decreased by 38% -54.5%, with an average of 27.7%. At the peak of the four generations of cotton bollworms, the removal of side hearts and axillary buds in a timely manner reduced the stock of eggs and larvae by 52.5% and 58%, respectively.
2. Spawn: 80% of the eggs of the second generation of Helicoverpa armigera are produced on the tips of the tender tips and the front of the leaves. The eggs are eradicated on a row-by-frame basis during the egg's height and wiped once every three days for 3-4 consecutive times. Relieve harm. According to the survey, in general, even wiping 2 times can reduce the amount of eggs by 60% or so, and wipe 3 times by 80%-90%.
3. Irrigation: In the flood season of Helicoverpa armigera, combined with drought irrigation, the mortality rate of alfalfa can reach about 70%. According to another data, if the flooded submerged topsoil is about 1.5 hours, the death rate of cotton bollworms will be 100% within 1 day after the irrigation, and the mortality rate will be 77% to 85% after 3-4 days, and the death rate will be 6-8 days. Up to 61%-73%.
4. Spraying Fertilizer: In the adult stage of cotton bollworm, 1%-2% superphosphate leaching solution is used as foliar spray fertilizer. Generally, the amount of eggs laid in the cotton field can be reduced by 33.3%-74.4% with an average of 55%.
5. Cockroach: After the harvest of wheat, the larvae were killed in a timely manner. The kill rate of the bollworm was 44.4%.
6. Apply morning and evening spraying: Select the spray in the morning or in the evening for the characteristics of bollworm-phobia and dizziness, and the characteristics of certain chemicals (such as Bt, phoxim, and mixed formulations containing phoxim). The medicine can increase the control effect by about 20%.
7. Implement whole-plant thorough spraying: When the bollworm occurs, use the same agent to spray quickly and extensively, and the control effect will increase by 30%-40%.
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