Consultation: How to prevent greenhouse whitefly?
answer:
First, the characteristics of damage
Adults and nymphs clustered on the back of leaves and sucked plant sap, causing the leaves to turn green and yellow, causing the plants to grow weak, to the death of the whole plant, and can also cause honeydew leaves and fruit to produce coal pollution, affecting the photosynthesis of plants.
Second, why the greenhouse whitefly is difficult to control
1. The greenhouse whitefly has a short life cycle, which can be completed in 8 to 9 generations a year. The common generation overlap in the greenhouse poses difficulties for prevention and control. 2. Each adult of the greenhouse whitefly can produce 150 eggs, and the reproduction rate is high. Once the damage spreads, it is difficult to control. 3. The resistance of greenhouse whitefly, egg and old nymphs is strong, and it is difficult to control the general pharmaceutical agents.
Third, control methods
1. Incubate insect-free seedlings and prevent greenhouse whitefly from entering the greenhouse with seedlings. 2. Eradicate the weeds in the greenhouse and bring them out of the house to prevent the greenhouse whitefly from flying to the seedlings. 3. Fumigate or spray with chemicals before planting to kill greenhouse whitefly in the greenhouse. 4. Greenhouse Vents and Doors plus Insect Insect Nets to prevent migration of greenhouse whitefly adults to the greenhouse. 5. In the greenhouse, hung yellow traps to kill greenhouse whitefly adults, hung 20 to 25 yellow boards per acre, pay attention to the height of the yellow boards should be consistent with the upper leaves of the plants. 6. Note that alternate medication, every 7 to 10 times, even the prevention of 3 to 4 times, so as to prevent pests produce resistance, but also to solve the difficult problem of overlapping generations of prevention and control.
The commonly used pharmaceuticals include: 1000 times solution of bufalin, 1000 times of locust forest, 800 times of azadirachtin, 3000 times of deltamethrin, and 2000 times of fenvalerate.
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