The Prevention and Control of the Second-generation Cotton Bollworm

Since the insect-resistant cotton was widely planted, it effectively controlled the second-generation cotton bollworm. Therefore, most cotton fields should adopt prevention and control measures based on agriculture and trapping and killing adults, with little or no chemical control, so as to give full play to the role of natural enemies in controlling insects and enhance the ecological control ability of cotton fields. However, because of the variety of crops planted and the resistance to insects of a few insect-resistant cotton varieties, the second-generation H. armigera is still a serious hazard in some cotton fields and other autumn crop fields. It is necessary to carry out chemical control in a timely manner depending on the pest severity.
1, after the agricultural control of wheat crops shallow plough irrigation, stubble sowing, destruction of the diverticulum, low insect resources; in the spawning period of cotton bollworm, combined with top dressing, spraying 1%-2% of superphosphate calcium leachate, reduce cotton field oviposition Amount; eggs and larvae during the peak, combined with cotton pruning stalks, artificially pinch eggs to catch insects.
2. Adults are tempted and killed to use the adult larvae of cotton bollworms, and willow twigs, frequency vibration type insecticidal lamps, etc. are used to trap adult insects.
3, chemical control 100 larvae when spraying more than 10 when the spray can be used 1.8% avermectin 5000-6000 times or 4.5% beta cypermethrin EC 2000 times spray once.