Tomato yellow leaf curl virus disease is a devastating disease caused by Tomato yellow leaf curl virus infection. In recent years, some tomato production areas in China have been outbreaks, and they have gradually spread and spread. The scope of the disease has been expanding, causing tomato production. huge loss.
After tomato infection with yellow leaf curl virus disease, the edges of the leaves were bright yellow, curled, dark green veins, thickened leaves, smaller leaves; plants dwarf atrophy, delayed flowering, flowers and fruit reduction, serious loss of yield. Plants that were infected early were often severely dwarfed, grew slowly, or stagnated. The leaves before erecting were erect, the leaves became small and wrinkled, the leaves veins were yellowed to the edges of the leaves, and fruit setting was reduced or fruit setting was not achieved. In late-stage diseased plants, only the upper leaves and sprouts showed symptoms. The results were reduced, the fruit became smaller, and the fruits in the ripening stage were unevenly colored (red-permeability), and the product value was basically lost. The disease manifests itself in various stages of the field. The earlier the disease becomes heavier, the greater the loss.
Tomato yellow leaf curl virus disease mainly transmitted through the B-type and Q-type whitefly, and all ages of Bemisia tabaci can transmit the virus. The virus can be transmitted through male and female mating, or it can be transmitted to the offspring through the eggs of infected females, and it can be transmitted for at least 2 generations. At present, there are no effective pharmaceutical agents that can cure tomato yellow leaf curl virus disease. Existing drugs can only inactivate viruses, delay the onset of disease, and reduce yield loss. The selection of disease-free strong seedlings, the elimination of virus-borne tobacco whitefly, and the cut-off of the route of drug transmission are currently effective measures to prevent and control tomato yellow leaf curl virus disease.
1. Cultivate disease-free seedling nursery beds separate from the field and centralize management; use 40-mesh insect nets to isolate the whitefly to avoid infection at the seedling stage; hang yellow sticky board; spray thiamethoxam and other drugs before transplanting Shimoda.
2. Keep the environment of the greenhouse clean and smoked with dichlorvos before transplanting, and close the shed for more than 3 days. Thoroughly remove weeds from the perimeter of the shed. The ventilation outlet and the doorway of the greenhouse were covered with a 40-mesh insect net and sprayed with insecticide. After hanging in the shed, yellow plates were baited to kill the whitefly. Reduce the flow of people in the shed and prevent human transmission. During the growing season, the branches and leaves of the densely-pollinated aphids and eggs of the lower part of the plant were promptly removed, and the branches and branches were taken out of the field and destroyed centrally.
3. Health care cultivation of microbial fertilizer, control the amount of nitrogen fertilizer, increase organic fertilizer and phosphorus and potassium fertilizers, improve plant disease resistance.
4. Chemical control of Bemisia tabaci using 25% thiamethoxam water dispersible granules 2000 to 3000 times, or 25% buprofezin WP 1000 to 1500 times, or 20% acetamiprid soluble liquid 3000 times , Or 2.5% bifenthrin EC 2000 ~ 3000 times, or 1.8% abamectin EC 1500 times, etc., on both sides of the blade spray. Pay attention to alternate rotation of medication to delay the development of resistance to B. tabaci.
5. Pesticide prevention and control of viral disease before the onset or early onset of the use of bacteria grams of grams of grams of 2% Ning Nanmycin water 250 times, or virus A 20% do not spray copper acetate wettable powder 500 times liquid, to passivation virus. In combination with spraying of alizarin lactone, urea, etc., can promote the recovery of diseased plants as soon as possible, reduce production loss.
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