Cotton bollworm control tricks
2. Spawn: 80% of second-generation H. armigera eggs are produced on the tips of the tender tips and the front of the leaves. The egg is wiped off by the tree at the peak of the egg and wiped once every three days for 3-4 consecutive times. Relieve harm. According to the survey, in general, even wiping 2 times will reduce the amount of eggs by 60% or 30% and reduce the number of eggs 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 flooding inundates the surface soil for about 1.5 hours, the death rate of cotton bollworms will be 100% for one day after the soil is inoculated, and the mortality rate will be 77-85% for 3-4 days after the soil is inoculated. 61-73%.
4, spray fertilizer: In the adult stage of cotton bollworm, with 1-2% of superphosphate soaked liquid foliar spray fertilizer, generally can make the amount of eggs fell 33.3-74.4% cotton field, an average of 55%.
5. Cockroach: After the harvest of wheat, the larvae were killed in a timely manner and the kill rate of the bollworm was 44.4%.
6, the implementation of early and late spraying: against bollworm fear of light and dark habits and certain agents (such as Bt, phoxim and mixed formulations containing phoxim) bogey light characteristics, choose to spray in the morning or evening The medicine can increase the control effect by about 20%.
7, the implementation of a thorough plant spray: In the occurrence of cotton bollworm, the use of the same agent than the rapid spraying extensive spraying, control effect increased by 30-40%.
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