How to prevent shed tomato ring disease

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, stalk and fruit onset, initially dark brown oval spot, slightly concave after expansion, and black mold and concentric wheel pattern appeared. 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, the main technical measures should be taken as follows:
1. Seed disinfection Soak seeds in warm water at 52 °C for 30 minutes, remove them and spread them on bamboo plates, then germination and sowing.
2, using non-toxic bacteria to raise seedlings for more than two years have not planted tomato, pepper and other Solanaceae crop soil seedlings, seedlings cultivation, until the seedlings grow to 8-10 cm, then transplanted to the field.
3. Scientific training Pay attention to the drainage after rain and reduce 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 18-20 ° C, and the relative humidity of the air is controlled at 60-70%. 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, the soil should be cultivated in time and the rods should be prevented from falling down, and the old leaves and diseased leaves should be removed in time to be buried outside the shed. In the later stage, 5-8 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 foliar surface, and then 0.3% urea is added.
4. Chemical control The application of the drug at the seedling stage 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 to prevent water spray.

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