Non-pharmaceutical Control Technology of Cotton Bollworm

1, intercropping for pests. The practice of production has repeatedly proved that the proper amount of corn, sorghum, sesame, celery, carrots, etc., planted in the cotton field or planted in the cotton field can effectively trap and kill the bollworm and control the occurrence of the bollworm. Approximately 200 corn plants per acre around the cotton field and between rows are capable of attracting a large number of natural enemies of the cotton field to inhabit and reproduce on the corn, and can attract cotton bollworms to spawn on them to facilitate predation by natural enemies. 2, pruning pests. In the cotton bud age, the removal of the head of the field management and the removal of invalid flowers and buds out of the field can significantly reduce the stock of field eggs and newly hatched larvae. According to the survey, when the 2nd generation of H. armigera was trimmed one time, the number of eggs per 100 plants decreased by 40-60%; in the cotton field of the 2nd generation of H. armigera during the development period, the stock of eggs was reduced by 3.5-54.6%; For the peak period of the cotton bollworm, removing the core and axillary buds promptly can reduce the stock of eggs and larvae by 52.5 and 58%, respectively. 3, wipe eggs and disinfestation. The 2nd generation H. armigera eggs are mainly produced on the tips of the tender tips and the front of the leaves. The eggs are erased one by one by the tree at the height of the egg, once every 2-3 days, 2-3 times in succession, and 70% of the eggs in the field can be reduced. the above. 4, irrigation pest control. Combining the winter irrigated with cotton fields can weather the soil and freeze the pests, reducing the overwintering bollworm population by 43.6-72.2%. Cotton growth period, according to the needs of plant growth, in the flood season of the 2nd and 3rd generation of Helicoverpa armigera combined with drought irrigation at the right time, to control the 3rd generation and reduce the 4th generation of cotton bollworm harm has a significant effect. According to the survey, timely irrigation, the mortality rate of cockroaches can reach about 70%, and the number of eggs in contemporary 100-plants has dropped by 65%. According to the data, if the flooding inundates the surface soil for about 1.5 hours, the death rate of cotton bollworms will be 100% within 1 day after the soil is inoculated, and 80% of the deaths will occur in 3-4 days after the soil is inoculated, and 70% of the soil will be killed in 6-8 days after soil implantation. 5. Phosphorus disinfestation. The bollworms have the characteristics of fear of phosphorus when they lay eggs and they run away when they encounter phosphorus. Phosphorus can also soften the eggshell of the bollworm, affecting the hatching of its larvae. Therefore, in its spawning period, with 2% of superphosphate or potassium dihydrogen phosphate 300-500 times the solution, the cotton field outside the root spray, spray 50-60 kilograms per acre each time, spray 5-7 days interval 1 time. In this way, the amount of eggs laid in the cotton field can generally be reduced by 33.3-73.4%. 6, artificial pest control. During the larval stage of the cotton bollworm, people are organized to catch large-scale larvae in the cotton field. This method can be used as an emergency measure when preventing and controlling the wrong time, and it can also be used as an important means for the scavenging of the drug after it is controlled. 7, put the bees out of insects. When the rate of the ovum in the cotton field reaches more than 5%, the 15,000 Trichogramma per acre will be released, and once every 5 days, it will be released 4 times, and the control effect will reach 70-100%. 8, light trapping. According to the phototaxis of Helicoverpa armigera, installing 1 black light lamp to trap adult insects per 20-35 mu of cotton field can reduce the amount of eggs in the field by 25-35%; according to systematic observations, the female moth accounts for 75.9 in the total number of female moths during June-September. %, of which 65% did not lay eggs and lay eggs. 9, Willow branch traps. Willow branches contain certain special chemicals that have a strong trapping effect on the cotton bollworm moth; fresh poplar and switchgrass are allowed to stand for 1 day, causing them to wilt, and then bundled into 10 pieces per 10 pieces, inserted in the evening. Put in the field; grow 60-70 centimeters long, 20-30 centimeters higher than the cotton plant, put 10 per acre, and use a plastic bag to catch the moth on the 2nd morning, and then take it back and sprinkle with water to moisturize it. Prevent the leaves from falling off and re-insert into the field in the evening. Yang and willow branches are generally replaced every 5-7 days to ensure the effect of moth trapping. 10. Sex attractants attract insects. Two to three days prior to the occurrence of each adult, one basin trap per acre was set. The trap is slightly higher than the crop, the pot diameter is 35-40 cm, and the lure (rubber plug) with sex attractant is 2-3 cm from the water surface. The lure is best placed after sunset, recovered after dawn, and kept sealed in a dark place (placed in a refrigerator freezer). The validity period of the secret trap is only about 20 days, so it needs to be replaced once every 1st generation of cotton bollworm. According to experiments, the ratio of hatching rate between the 2nd generation baiting field and the control field egg is 1:2.35. It can be seen that the application of sexual attractants has played a significant role in the reduction of insect populations.

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