pests and diseases of tomato

1. The main common pests and diseases of tomato The main pests and diseases of tomato are leaf mold, virus disease, late blight and aphid. Its symptoms are as follows:
Tomato leaf mold: The diseased part is on the leaves, and there are irregular yellow-green spots on the diseased leaves. On the back of the diseased leaves, the white mold layer gradually turns into a dark brown mold layer.
Tomato virus disease: Tomatoes are prone to virus diseases in autumn, and aphids are the main vector of the disease. Yellow-green stripes appear on the diseased leaves, causing the leaves to shrink, the leaves become smaller, the veins are transparent, the leaf margins are curled, and the fruits are susceptible to striped lesions.
Botrytis cinerea: This disease damages leaves and fruit. Starting from the leaf tip or leaf edge, it gradually turns from dark green water-soaked spots to brown. The green fruit is susceptible to the disease, and the initial stage changes from dark green to dark brown. When the ambient humidity is high, oil spots of white mold appear on the lesions.
Tomato aphids: Aphids mainly suck the sap on tomato plants, causing the leaves to curl and turn yellow. They are the main pests that spread viral diseases. 2. Control methods of main diseases and insect pests of tomato
The control of tomato diseases and insect pests should focus on prevention and comprehensive management. First of all, it is necessary to select good seeds, and then disinfect the seeds, and the seedbed should be disinfected as much as possible. We can mix 50% carbendazim wettable powder and 50% thiram wettable powder in a ratio of 1:1, and cover the seeds with about 8-10g/m2 and 15-30kg of fine soil. Apply heavy base fertilizer, increase phosphorus and potassium fertilizer, and spray 6000 times of Aiduoye to enhance disease resistance and prevent aphids in the later stage. Avoid wet soil or water accumulation, and the diseased plants should be removed and destroyed in time.
Leaf mold control: Spray with 83100 times liquid at the seedling stage and after the slow seedling stage.
Prevention and treatment of viral diseases: 500 times of 20% virus A wettable powder, or 800 times of 1.5% Zhibingling emulsion, or 2000-3000 times of 25% thiamethoxam water dispersible granules.
Botrytis control: spray 50% mancozeb 800-1000 times on the affected area, and spray on the soil surface at the same time, spray once every 15 days or so, and spray 2-3 times in total.
Aphid control: 1000-1500 times of 2.5% imidacloprid EC or 1000-1500 times of 4% Jianzhu EC can be used to spray and kill. In short, there are many common diseases and insect pests on tomato, but the main ones are leaf mold, virus disease, late blight, and aphids. In terms of prevention and control methods, prevention is the priority, and comprehensive prevention and control is used. Control was carried out from the aspects of seed selection, seedbed disinfection, field management, and chemical control. Early detection and prevention