Identification and Control of Tomato Leaf Mould

Tomato leaf mold mainly damages the leaves, and in severe cases it also harms stems, flowers and fruits. The leaves were infected, and irregular pale yellow chlorotic spots appeared on the leaf surface. The primary white fungus layer was found in the dorsal disease area. The mold layer turned grayish brown or dark brown velvet. When the conditions are appropriate, black mold can also grow on the front of the lesion. As the disease progresses, the leaves gradually curl from the bottom to the top, and the plants are yellow-brown and dry. The fruit is infected, and black round or irregular shaped patches are formed near the fruit pedicle or on the fruit surface, and the depression is hardened and cannot be eaten. The stems are infected and the symptoms are similar to the leaves. The development temperature of the leaf mold fungus is 9°C to 34°C, and the optimum temperature is 20°C to 25°C. The temperature of 22°C or so, and the relative humidity of more than 90°, is conducive to the reproduction of the bacteria and the severity of the disease. Even in rainy weather, poor ventilation in greenhouses, high humidity in the shed or weak light, and rapid expansion of leaf mold. The sunshine in sunny days is sufficient, and the temperature in the shed is increased to 30°C to 36°C in short term, which has a significant inhibitory effect on the bacteria. Control methods: 1, selection of disease-resistant varieties. 2. Seeds soaked in warm water at 53°C for 30 minutes before sowing and allowed to dry. 3, the incidence of heavy regions for more than 3 years of rotation. 4. Adopt the ecological prevention and control method to strengthen the management of temperature and humidity in the shed, timely ventilation, proper control of watering, and timely dehumidification after watering. Proper close planting, timely pruning and fork, fertilizer according to formula, avoid excessive nitrogen fertilizer, improve plant resistance to disease. 5, the early onset of the disease with 45? chlorothalonil smoke agent per acre with 250 grams of smoke overnight, or in the evening spray 7? leaf mold net dust agent, 6.5? toluene mold superfine dust agent, interval 8 to 10 days 1, Use continuously or alternately. 6, can be sprayed at the beginning of the disease 47? Garen Nong WP 700 ~ 800 times, 50? Mouldy mildew or morphine WP 800 times spray treatment, continuous control of 2 ~ 3 times.

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