Tomato ring disease is one of the diseases that are easy to occur in the greenhouse and greenhouse cultivation of tomato. The damaged leaves initially appear as water-stained dark green lesions, which gradually expand into a nearly circular or irregular shape with concentric circles. In wet conditions, the lesions will grow black cream. Most of the lesions start from the lower leaves of the plants and gradually develop into the upper leaves. In severe cases, the lower leaves are wilting and dead. Petiole, stem and fruit onset, initially dark brown oval spots, slightly concave after expansion, and black mold and concentric wheel pattern. Green fruit lesions occur from near the flower buds. The disease is heavier, the fruit is cracked, and the diseased part is hard. To prevent and treat this disease, we should take the following technical measures:
1. Seed disinfection. Soak seeds in warm water at 52 ° C for 30 minutes, remove them and spread them on bamboo trays, then germination and sowing.
2. Breeding with non-toxic bacteria. The soil of the Solanaceae crops such as tomato and pepper has not been planted for more than two years as a seedbed, and the seedlings are cultivated. When the seedlings grow to 8 cm to 10 cm, they are transplanted to the field.
3. Scientific training. Pay attention to the drainage after the rain and lower the water table. Reasonable close planting, generally planting about 4,000 plants per mu to prevent excessive density, so as to facilitate ventilation and light transmission between rows. It is also necessary to strengthen the room temperature and humidity control of the shed. Generally, the temperature is controlled at 18 ° C to 20 ° C, and the relative humidity of the air is controlled at 60% to 70%. At the initial stage of planting, water cultivation should be controlled, and watering should be properly carried out before flowering until the second round of ear formation is formed, and then water is poured in time to promote fruit development and expansion. Watering should be carried out after 10 am on a sunny day and ventilated in time to avoid morning leaf condensation. In the process of tomato growth, it is also necessary to timely cultivate the soil and insert the rod to prevent it from falling down, and timely remove the old leaves and diseased leaves, and take them out of the shed for deep burial. In the later stage, 5 kg to 8 kg of potassium fertilizer should be applied per acre to enhance the disease resistance and increase the sugar content of the fruit. During the fruit setting period, 0.1% sucrose and 0.2% potassium dihydrogen phosphate can be sprayed on the foliage, and then 0.3% urea is added.
4. Chemical control. At the beginning of the seedling stage, the application can be controlled by spraying with 70% mancozeb WP 500 times. After the seedlings are planted, they are transplanted with medicine. When you first see the lesion, you can use chlorothalonil, chlorhexidine, carbendazim, Dafudan, Bordeaux mixture, collateral mixture and other drugs, and control with water spray.
Excerpt from: "China Special Products"
1. Seed disinfection. Soak seeds in warm water at 52 ° C for 30 minutes, remove them and spread them on bamboo trays, then germination and sowing.
2. Breeding with non-toxic bacteria. The soil of the Solanaceae crops such as tomato and pepper has not been planted for more than two years as a seedbed, and the seedlings are cultivated. When the seedlings grow to 8 cm to 10 cm, they are transplanted to the field.
3. Scientific training. Pay attention to the drainage after the rain and lower the water table. Reasonable close planting, generally planting about 4,000 plants per mu to prevent excessive density, so as to facilitate ventilation and light transmission between rows. It is also necessary to strengthen the room temperature and humidity control of the shed. Generally, the temperature is controlled at 18 ° C to 20 ° C, and the relative humidity of the air is controlled at 60% to 70%. At the initial stage of planting, water cultivation should be controlled, and watering should be properly carried out before flowering until the second round of ear formation is formed, and then water is poured in time to promote fruit development and expansion. Watering should be carried out after 10 am on a sunny day and ventilated in time to avoid morning leaf condensation. In the process of tomato growth, it is also necessary to timely cultivate the soil and insert the rod to prevent it from falling down, and timely remove the old leaves and diseased leaves, and take them out of the shed for deep burial. In the later stage, 5 kg to 8 kg of potassium fertilizer should be applied per acre to enhance the disease resistance and increase the sugar content of the fruit. During the fruit setting period, 0.1% sucrose and 0.2% potassium dihydrogen phosphate can be sprayed on the foliage, and then 0.3% urea is added.
4. Chemical control. At the beginning of the seedling stage, the application can be controlled by spraying with 70% mancozeb WP 500 times. After the seedlings are planted, they are transplanted with medicine. When you first see the lesion, you can use chlorothalonil, chlorhexidine, carbendazim, Dafudan, Bordeaux mixture, collateral mixture and other drugs, and control with water spray.
Excerpt from: "China Special Products"
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