Vegetable rapeseed and cotton bollworm are the most troublesome in the planting process. If the control is not timely, the yield will be reduced. This article will introduce the comprehensive control technology of vegetable rapeseed and cotton bollworm in detail.
First, the prevention and control of rapeseed
1. Agricultural control (1) Reasonable arrangement of vegetables. (planting varieties; (2) appropriate adjustment of the sowing period, so that the large occurrence period of pests and vegetable worms staggered; (3) timely tilling the vegetable fields after harvesting, remove the residual leaves, to reduce the source of insects. (4) in the morning If the sun is not out and the dew is not dried before pouring water, it can greatly reduce the damage of the vegetables. (5) Appropriate irrigation, increase the humidity in the field, can inhibit pests and promote the growth of vegetable seedlings.
2. Chemical control: It should be carried out according to the field investigation and report, and seize the adult germination period and egg incubation period. Available agents are 18% insecticidal double water agent 800-1000 times solution; 80% dichlorvos EC 1000-1500 times solution; 21% synergistic cyanoma cream or fenvalerate EC 6000 times solution; 2.5% Kung Fu EC 4000 times liquid; 20% anti-sweeping emulsifiable concentrate or 2.5% Uranus emulsifiable concentrate 3000 times liquid; Bacillus thuringiensis preparation Bt emulsion 500-700 times liquid, etc. have good control effect.
Second, the prevention and control of cotton bollworm
1. Agricultural control: Remove the insects and lower the insects. Early, middle and late ripe varieties should be combined to avoid the second generation of cotton bollworms.
2, biological control: Helicoverpa armigera nuclear polyhedrosis virus, can cause a large number of larvae to die.
3. Chemical control: During the peak period of hatching to the second instar, the larvae have not been put into the fruit for application. Pay attention to alternate rotation medication. For example, after 3 years of age, the larvae have already entered the fruit, and the application effect is very poor. Commonly used pharmacy: 2.5% enemy kill 3000-4000 times, 5% kungfu emulsifiable oil 4000-5000 times, 21% kill 毙 emulsifiable concentrate 6000 times liquid, 2.5% Uranus emulsifiable concentrate 3000 times, security 1000 times and so on.
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