Whitefly is a major hazard to greenhouse melons, legumes, and solanaceous vegetables. Adults and nymphs suck the sap of vegetable leaves, causing the leaves to turn green and yellow. At the same time, whitefly also secretes a large amount of honeydew, contaminates the leaves and fruits, and not only affects the photosynthesis but also often causes the occurrence of the disease. Therefore, we must strengthen the prevention and control of whitefly, and should adopt pollution-free methods of prevention and control, both to ensure pest control and increase production and income, but also to ensure food safety.
First, the characteristics of occurrence
More than 10 generations of whitefly occurred in a year, the northern part of the greenhouse in the winter, after the temperature rose in late spring, gradually migrated to the open ground, the number of population population increased from July to August, after the temperature dropped from October to November, and then to the vegetable greenhouse Transfer hazardous vegetables.
Second, control methods
1. Reduction of insects: Try to avoid planting whitefly host crops around greenhouses. Cucumbers, zucchini, eggplants, peppers, tomatoes, and kidney beans cannot be planted in the greenhouse to reduce cross-harvest hazards of the whitefly insects outside the greenhouse.
2. Insect Infestation Law: In the greenhouse vegetable production process, as long as the temperature outside the shed is still suitable for survival of whiteflies, insecticide prevention nets should be added to prevent whitefly from entering the shed.
3. Ticking method: The old fiberboard or cardboard made of 1 meter 0.2 meters slats, painted with orange paint yellow, and then use a small amount of oil on the 10th to add a little oil transferred to stickworm oil coated on the slats. Hang the slats between the rows of vegetables. The height of the slats is the same as the height of the plants. Usually 35 to 40 pieces per mu of shed, 7 to 10 days after the slats are sticky with whiteflies, they are applied once more.
4. Smoke-killing method: Use an appropriate amount of sawdust per acre to absorb 80% of dichlorvos emulsifiable concentrate 300 to 400 grams, apportioned into 15 to 20 piles with a dark fire to ignite, smoke at night, closed when the smoke shed, generally smoked to kill 2 ~ 3 times, every 7 to 10 days.