Control methods of cherry tomato leaf mold

Growing cherry tomatoes in greenhouse is often attacked by leaf mold, so vegetable farmers should pay attention to prevention and control. First, the symptoms mainly harm the leaves, and in severe cases, they also harm the stems, flowers and fruits. The leaves were infected with irregular or oval yellowish chlorotic spots on the leaf surface, the primary white mildew layer in the leaf back disease, and the mildew layer became grayish brown or dark brown velvet in the later stage. When the condition is suitable, black mold can also grow on the front of the disease spot, with the expansion of the disease, the leaves curl gradually from the bottom up, and the plant is yellowish brown and dry. When the fruit is infected, black round or irregular patches are formed near the pedicel or on the fruit surface, which are hardened and sunken and cannot be eaten. The tender stem or stalk is infected with symptoms similar to those of leaves. Second, prevention and control methods 1. Reasonable rotation. In the seriously affected areas, rotation should be carried out for more than 3 years to reduce the source of primary infection. two。 Soak the seeds. The resistant varieties were selected and the seeds were soaked in 53 ℃ warm water for 30 minutes before sowing. 3. Strengthen the management and protection. Strengthen the management of temperature and humidity in the shed, timely ventilation, proper control of watering, timely moisture drainage after watering, to form unfavorable temperature and humidity conditions for the occurrence of bacteria, appropriate close planting, timely pruning and branching; formula fertilization to avoid excessive nitrogen fertilizer and improve plant disease resistance. 4. Chemical fumigation. Fumigate the greenhouse or greenhouse with sulfur powder before planting, every 55 cubic meters of space, 0.13 kg of sulfur and 0.25 kg of sawdust, ignite after mixing, seal the greenhouse and smoke for 24 hours before planting. At the initial stage of the disease, 45% chlorothalonil smoke remover can be used 250 grams per mu of shed each time, smoked overnight. 5. Skillfully apply powder. Spray 7% leaf mold clean dust or 5% plus Renong dust or 6.5% methyl carbendazim ultra-fine dust in the evening, 1 kg per mu, once every 8-10 days, alternately. 6. Spray the potion. In the early stage of the disease, 100 times 150 times of Wuyisu water agent or 47% of 700 times of Ruinong wettable powder or 800 times of 50% carbendazim wettable powder or 400 times of 40% carbendazim wettable powder can be sprayed at the initial stage of the disease, spraying 50% 65 liters per mu. Spray once every 7 to 10 days, for 2 times in a row.