Answer: According to the description, it is determined that this is not downy mildew. It should be tomato leaf mold.
Symptoms of damage: The disease mainly damages the leaves, and in severe cases it also harms the stems, flowers, and fruits. Initially, the front of the leaves produces light yellow spots with indistinct edges, and then from the back of the leaves, a gray-brown or dark brown villous mold layer is produced. Severe disease leaves curled to death. The incidence of fruit, multiple pedicles to expand around the formation of irregular black spots on the fruit surface, lesion hardening, depression. Severely occurring plots often drop heavily.
Prevention measures: 1. Rotation is down. The disease only occurs on tomatoes. Rotation with non-tomato crops can significantly reduce the occurrence of pathogens. 2. High temperature stuffy shed. When the disease occurs, the temperature in the shed can be raised to 30-33° C. for two hours on a sunny morning, and then ventilation and cooling are performed to prevent the disease. 3. Strengthen greenhouse management. The focus is on ventilation and moisture in the shelter. It is best to control the temperature in the shed below 28°C and humidity below 75%, which is the key technology for preventing and treating the disease. At the same time, we must pay attention to timely removal of the diseased leaves and old leaves of the plant to increase ventilation and light transmission. 4. Chemical control. Choose 2% of Wuyimycin (B0 ~ 10) liquid agent 150 times, which is the preferred agent for the prevention and treatment of the disease; also can choose 80% of dexamethasone WP 500 times, 50% carbendazim WP 500 Times, 70% of mancozeb 500 times, 47% of Garnett's WP 500 times, or 70% of cadmium 500 times spray. Once every 7 to 10 days, spray three times. 45% of the chlorothalonil smoke agent was used in the protected area. The amount of 250 grams per mu was used to smoke at night and the effect was also very good. To illustrate, a lot of information describes the use of enemy force spray, the drug is best not to use in the shed, humidity often causes phytotoxicity.
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