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In addition, adults and nymphs also secrete honeydew, causing coal fouling. When the occurrence is serious, the leaves are black, which seriously affects the photosynthesis and flower viewing effects of the plants. Bemisia tabaci has a fast development rate, high reproductive rate and strong outbreak. Because the insect is feeding on the back of the leaves of the host plant, it has strong concealment. The adults of Bemisia tabaci are white worms with a body length of less than 1 mm. When they are parked on the plants, the left and right wings are closed to form a ridge.
Control methods: (1) Cultivate “no insectsâ€. When the seedlings are planted, the seedbed is separated from the production greenhouse. Before the seedlings, the high-concentration agent is used to fumigate the seedbed to completely remove the insects and weeds, and the control insects are brought into the field. (2) Avoid mixing cucumber, tomato and zucchini in the greenhouse, and advocate the connection with celery, onion and garlic to control the insects on the cultivation agronomy. (3) Tobacco is not resistant to low temperature, but it can be wintered in greenhouses and double-film covered greenhouses. To prevent and control Bemisia tabaci, it can be rejected outside winter greenhouses and greenhouses, and strengthen the prevention and control of indoor whitefly in the wintering period. (4) Yellow has a strong trapping effect on adults of Bemisia tabaci, and yellow plates can be set to trap adults. The method is as follows: use 1×0.2 m fiberboard or cardboard, paint orange yellow, and then apply a layer of viscous oil (you can use 10 oil and a little butter to mix thoroughly), set 32-34 pieces per acre, placed between rows In accordance with the height of the plant, the yellow plate should be reapplied once every 7-10 days, taking care to prevent oil droplets from causing burns on the crop. (5) When the whitefly is started, 1.8% Ai Fuding 2000-3000 times liquid and 40% green vegetable treasure 1000 times liquid can be used. 70% Emerald water-dispersible granules 10000-15000 times, 25% chlorpyrifos 1000 times solution, or 10% imidacloprid 2000 times solution, 25% AKTA 7500 times solution; 2.5% kungfu 2000-3000 times solution 3% acetamiprid 3000 times solution, once every 3-5 days, continuous control 2-3 times, when the density of insect population is high, you can use 2.5% Uranus 1000-1500 times liquid or 5% Regent 1500 times Liquid control, in addition to the prevention and control of nymphs, can also kill adults. The medicine is stopped 5-7 days before the harvest. (5) Unified control, because B. tabaci harms a variety of crops and weeds, has strong reproductive ability, rapid reproduction, and prevention and control should be carried out in a large scale, in order to receive better results.
Bemisia tabaci is a polyphagous pest with a wide range of hosts. In addition to harming tomatoes, cucumbers, zucchini, eggplant, beans, cruciferous vegetables, and fruit trees, flowers, cotton and other crops, it can also be parasitic on a variety of weeds. . Bemisia tabaci is caused by adults and nymphs sucking plant sap, causing the plant to grow weak, yield and quality decline, and even the entire plant to die, and can spread more than 70 viral diseases on 30 plants.
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