Prevention and treatment of cotton bollworm
1, agricultural control: removal of insect pests reduce the insect mouth. Early, middle and late maturing varieties should be matched to avoid the damage of the second generation of cotton bollworm.
2, biological control: Helicoverpa armigera nuclear polyhedrosis virus, can make a large number of death larvae.
3. Chemical control: During the period from the hatching to the second instar, the larvae have not yet taken fruit into the fruit. Pay attention to alternate rotation medications. If the 3rd instar larvae have invaded the fruit, the effect of the application is very poor. Commonly used agents: 2.5% enemy killed 3000-4000 times, 5% Kung Fu EC 4000-5000 times, 21% killed EC 6000 times, 2.5% Uranus EC 3000 times, and security 1000 times.
The prevention and control of rapeseed meal
1. Agricultural control (1) Arrange vegetables properly. (planting varieties; (2) Adjusting the sowing date appropriately, staggering the period of occurrence of pests and the period of sensation of vegetables; (3) Plowing the vegetable fields in time after harvest, removing the defoliation of the remaining plants to reduce the source of insects.(4) In the morning If the sun is not sprayed and the water is poured before the dew is dry, the dish can be greatly reduced.(5) Appropriate irrigation to increase the humidity in the field can suppress the pests and promote the growth of the seedlings.
2. Chemical control: According to field surveys and reports, we should seize the period of adult emergence and egg incubation. The available agents are 18% insecticidal biphasic 800 to 1000 times; 80% dichlorvos EC 1000 to 150 times; 21% synergistic cyanamide or fenvalerate EC 6,000 times; 2.5% kung fu Emulsion 4,000 times; 20% chlorinated EC or 2.5% Uranus EC 3000 times; Bacillus thuringiensis Bt emulsion 500-700 times, etc. have good control effect.
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