First, the occurrence of pests and diseases
The main pests and diseases of cotton boll opening have four generations of cotton bollworm, followed by cotton blind mites, cotton small bridge worms and cotton leaf mites. The number of previous rains was relatively high, and the precipitation was relatively large. It was unfavorable for the third generation of cotton-aged worms. The average temperature in the middle and late August was close to normal, and the precipitation was more than normal. The overall meteorological conditions were favorable for the occurrence of the fourth-generation cotton bollworm.
Second, prevention and treatment methods:
1. Agricultural measures: Combine field management, pruning cotton, remove invalid flower buds and other measures to artificially wipe the eggs to reduce the pressure of prevention and treatment.
2. Chemical control: use 5% hexaflumuron emulsifiable concentrate 1000 times solution or 1% carbaryl salt 1000 times solution or pyrethroids, organic phosphorus and other pesticide sprays 1000~1500 times liquid spray; to prevent premature aging of cotton, can be combined with phosphoric acid Foliar fertilizer such as dihydrogen potassium.