Shed tomatoes in winter to prevent three diseases

In the deep winter, with severe haze, the temperature of vegetable greenhouses decreases, and the light is weakened. Diseases in tomato leaves are more common. If the diseases in the leaves are not timely controlled and the function of the leaves is reduced, the yield and quality of tomatoes will be seriously affected. The more serious leaf diseases were spot blotch, early blight and late blight. All these three diseases were fungal diseases, and most of them developed upward from the lower leaves, but the specific symptoms were quite different.

There are some round or nearly round spots on the leaf blight of the leaf blight. The spots are gray in the middle, dark brown in the edges and surrounded by yellow halos. In severe cases, the leaves are full of lesions, contiguous, sometimes perforated, and leaves yellow.

The appearance of early blight leaves leaves dark brown dots, followed by round or oval dark brown lesions, dark brown concentric rings, lesions often with yellow or yellow-green halos outside the lesions, humidity when the lesions There are gray and black mouldy.

Most diseased leaves of late blight disease begin from the tip of the leaf or the leaf edge, appear as water-immersed, and become dark green at the beginning, and then turn brown. The culms appear dark brown spots, the disease department is sunken, causing black stalks of tomatoes. The fruit is susceptible to onset in the period of young fruit, with irregular spots and water-like scalding. The lesions begin to harden and then slowly rot.

To control these three diseases, controlling the humidity in the shed is the key. First of all, strengthen water management, reasonable ventilation, reduce the humidity inside the greenhouse to prevent the occurrence and spread of the disease. Secondly, for diseased plants, diseased leaves and dead branches should be promptly removed to reduce the source of the disease. Again, timely medication control. In the early stages of spot blotch, 64% antiviral 500 times liquid, 25% coloammose 500 times liquid, and chlorothalonil and carbendazim sprays can be used for prevention and treatment. For prevention and control of early blight, 75% chlorothalonil 600 times, 80% mancozeb 600 times, or 58% trebic manganese zinc 700 times can be used. For the prevention and treatment of late blight, 58% metalaxyl MnZn 500x, 72% Kelu 500x, or 72.2% Prec 800x can be used for spraying. According to the disease every 5 to 7 days spray once, even spray 2 to 3 times. If the weather is not good and the humidity in the shed is high, powder or smoke may be used.

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