Winter and spring should be guarded against the rapeseed moth. Plutella xylostella is one of the main pests of rapeseed. When the damage is serious, it can reach the degree of extinction, and the generations overlap, which increases the difficulty of prevention and treatment. The prevention and control technology is introduced as follows:
Predictive inspection: When the rapeseed seedlings grow to 8 to 10 leaves, the field inspection is carried out. If the larvae per square meter reaches 20 or more, the pesticide should be sprayed 3 to 4 times to effectively control the insect pests.
Control method: In order to achieve the control effect and save expenses, the concentration of the drug solution should be appropriate. When dispensing the pharmaceutical solution, first put the medicine into the sprayer bucket, then add water to mix the liquid.
The concentration of the drug solution should be different according to different drugs, and the common control effect is better: 4.5% cypermethrin emulsifiable concentrate 1000-1500 times solution, 25% Huifeng gram emulsion 1500 times solution, 2.5% Kung Fu 2000 times liquid, 35% g moth 2000 times liquid, 0.9% Ai Fu Ding 2 2000 times liquid. If it is particularly serious, increase the concentration appropriately on this basis.
Group defense, joint prevention, timely and centralized prevention and control. In a natural village, a centralized prevention and control method should be adopted, and all the growers should be concentrated in a uniform time to spray on a piece by piece basis, and all of them should be played in 3 to 5 days. The control effect can reach more than 90%.
Predictive inspection: When the rapeseed seedlings grow to 8 to 10 leaves, the field inspection is carried out. If the larvae per square meter reaches 20 or more, the pesticide should be sprayed 3 to 4 times to effectively control the insect pests.
Control method: In order to achieve the control effect and save expenses, the concentration of the drug solution should be appropriate. When dispensing the pharmaceutical solution, first put the medicine into the sprayer bucket, then add water to mix the liquid.
The concentration of the drug solution should be different according to different drugs, and the common control effect is better: 4.5% cypermethrin emulsifiable concentrate 1000-1500 times solution, 25% Huifeng gram emulsion 1500 times solution, 2.5% Kung Fu 2000 times liquid, 35% g moth 2000 times liquid, 0.9% Ai Fu Ding 2 2000 times liquid. If it is particularly serious, increase the concentration appropriately on this basis.
Group defense, joint prevention, timely and centralized prevention and control. In a natural village, a centralized prevention and control method should be adopted, and all the growers should be concentrated in a uniform time to spray on a piece by piece basis, and all of them should be played in 3 to 5 days. The control effect can reach more than 90%.
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