What caused the rotten tomato fruit?

What causes rotten tomato fruit? Please introduce the rotten tomato fruit: first, the cause of the disease. The first cause of rotten tomato fruit is non-infectious physiological disease, mainly due to the lack of calcium and water imbalance in the fruit. Lack of calcium in ⑴ fruit: tomato photosynthesis produces a variety of organic acids, among which oxalic acid can cause poisoning and disease. When there is sufficient calcium in tomato plants, oxalic acid is neutralized by calcium to form calcium oxalate, which can avoid the harm of oxalic acid. When calcium is deficient, navel rot is easy to occur, resulting in rotten fruit. ⑵ water supply imbalance: after entering a large number of results, the external temperature increased significantly, leaf transpiration intensified and fruit rapid expansion required a lot of water and nutrition. Due to the large transpiration capacity of the leaves, the water that should be transported to the fruit is taken by the leaves, and the osmotic pressure of the leaf cells is higher than that of the green fruit cells, and the leaves even take water from the fruit. Therefore, the navel of the fruit far away from the root is first affected by drought, showing water loss, tissue necrosis, resulting in rotten fruit. Second, prevention and control measures. ⑴ soil improvement: choose sandy loam soil with deep soil layer and strong water retention capacity to plant tomato. If the soil is too sticky or contains too much sand, more organic fertilizer should be applied to improve its permeability and enhance its water retention capacity. ⑵ reasonable fertilization: avoid the application of immature organic fertilizer or fertilizer concentration is too high to prevent root burn. The base fertilizer is mainly organic fertilizer, combined with the application of calcium superphosphate in soil preparation. Attention should be paid to the combined use of nitrogen, phosphorus and potassium fertilizer when topdressing. ⑶ to strengthen water management: it is necessary to ensure a balanced water supply of tomato plants, especially in the period of sharp rise in temperature in early summer, when it is in the middle of the fruit, do not lack water and drought. ⑷ should strengthen plant adjustment: pruning and branching in time, removing diseased old yellow leaves, and paying attention to flower and fruit thinning. Third, the cause of the disease. Another reason for tomato rotten fruit is the infection of Botrytis cinerea. The pathogen overwinters and overwinters with sclerotia, mycelium or conidia on the disease residue, in soil or on the surface. Flowering is the peak period of Botrytis cinerea infection. ⑴ flood irrigation and cloudy days: this is the main cause of gray mold. Bacteria like low temperature, high humidity and low light. Once the conditions are right, they invade from wounds, aging organs and floral organs, resulting in rotten fruit. ⑵ density is too high and lack of light: luxuriant leaves, old yellow leaves are not cut, twigs are layered, vegetative growth is too prosperous, resulting in lack of light and bacterial proliferation. ⑶ diseased leaves are not completely removed: carelessness to diseased leaves, not removal or incomplete removal will cause cross-infection with healthy plants. Fourth, prevention and control measures. ⑴ comprehensive control: raising seedlings in disease-free soil. Reasonable close planting, strengthen ventilation and light transmission, especially in cloudy days, in addition to paying attention to heat preservation, irrigation should be strictly controlled. Clean up the diseased body in time, remove the diseased fruit and leaves, remove the concentrated burning and deep burial. ⑵ medicament control: spray can choose 50% Sukeling wettable powder 1500 times liquid, 50% Limakang wettable powder 1000 times liquid, 50% carbendazim wettable powder 1000 times liquid. Click to get more tomato planting techniques click to get more vegetable planting techniques