Causes and prevention measures of melon rot in greenhouse

With the expansion of the thick-skin melon cultivation area in the greenhouse and the increase of the multiple cropping index, the types of diseases of melons are also increasing. In recent years, the phenomenon of melon rot melon is more serious.

First, rotten melon cause (a) rotten melon caused by disease. The fungal diseases that cause melon melons are melon disease, sclerotia, anthrax, and black spot disease. The pathogens of these diseases can survive on seeds, soil, and plant diseases, and they are mainly transmitted by air currents. When the humidity of the external environment is high, they will be re-infiltrated and occur in large areas. The bacterial diseases that cause melon melons mainly include melon soft rot. The pathogens of these diseases can attach to the seeds, soil, and plant diseases and overwinters. They mainly spread through rain, insects and agricultural operations, and are infected by wounds and natural channels. , At 22 °C ~ 25 °C, the incidence of heavy air humidity. (b) Rotten melon caused by calcium deficiency. The harvested fruit is cut open, and if the pulp is rotted, it is generally caused by calcium deficiency in the soil. In addition, excessive application of potassium fertilizer, nitrogen fertilizer, will also affect the plant's absorption of calcium fertilizer, resulting in melon deficiency calcium rotten melon. (3) Rotten melons caused by improper cultivation and management. If you do not do a good job of seed disinfection; planting too dense, poor ventilation and light transmission; excessive watering after planting; partial nitrogen fertilizer, leading to excessive growth of plants, disease resistance decreased; prevention is not timely, increasing the incidence of disease .

Second, prevention and control measures (a) removal of plant diseases and reduce the number of bacteria in the greenhouse. After the harvest, the diseased body is buried or burned in time to reduce the number of pathogens. (b) do a good job in disinfection, cut off the spread of germs. Before sowing, the seeds should be air-dried, soaked in warm water or soaked with pesticide; the nutritious soil should be disinfected to prevent the invasion or cross-infection of pathogens. (c) Adopt agricultural measures to improve the disease resistance of melons. Pay attention to the time of watering and the amount of watering, and try to water the ground as little as possible so as to maintain a low humidity environment in the greenhouse and prevent multiple infections of the bacteria. (4) Prevention is the mainstay and comprehensive prevention and control. When using pyrimazine and other plant growth regulators to decorate, add a few drops of agricultural streptomycin to the pyrazole solution; and spray and spray the protective bactericide (Dasheng-M45, Jinrun) before and after irrigation to prevent disease. To prevent and treat medication in time. During the pollination period or within 10 days afterwards, medication should be used with caution to avoid damaging the young larvae. In the later stages of plant growth, fungicides can be used to control 2,000 or imported guaranty sprays.

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