In order to produce anti-season (time difference) vegetables to meet supply and improve efficiency, in recent years, vegetable production in protected areas has developed rapidly. In various protected vegetables, the planting area of ​​cucumber has also increased year by year. Gray mold is cucumber protection. A disease that occurs in the field cultivation all year round has been increasing year by year and has become a major obstacle affecting the yield and quality of cucumber.
Most of the gray mold of cucumber is caused by the infection of the fungus, the fungus, and the invasiveness of the female flower. The water-stained lesions are initially formed in the flower bud, and the gray-brown mold layer is gradually formed. The flower becomes soft, atrophied and rotted, and gradually expands to the young melon. The diseased part of the melon is yellow first, and the white mold is gradually produced and gradually turns into pale gray, which causes the growth of the diseased melon to stop, soften, rot and shrink, and finally rot off. . The leaves are infected, the lesions are water-stained at first, and then become irregularly shaped pale brown lesions with obvious edges. Sometimes the lesions grow a small amount of gray-brown mold. Under high-humidity conditions, the lesions rapidly expand to form large lesions with a diameter of 15-20 mm. After the stems are infected, the stems rot and the melons are broken, causing rotten sputum. It is easy to be popular under conditions of insufficient light, low temperature and high humidity.
How to effectively prevent gray mold? According to the planting structure of the cucumber in the protected area and the pathogenic characteristics of gray mold, the researcher of the doctoral state has finally launched a special pesticide product for fungicides : pyrimethoxazole, which not only can control ash well. Mildew can adjust growth and increase production. Dr. Bang introduces you to effective methods for controlling gray mold:
(1) Removal of the diseased body After the harvest, the diseased plant remains completely removed. The soil is turned over 20% or more, and the residual body left by the soil surface is turned into the bottom layer, and the disinfectant is added with a new high-fat film to disinfect the soil. Reduce the initial source of infection in the shed. In the seedling stage and before the melon is inflated, the diseased flowers, diseased melons and diseased leaves are removed in time, and the greenhouses are taken out and buried outside the greenhouse to reduce the source of reinfection.
(2) Strengthen cultivation management Strengthen ventilation and watering, watering the right amount, avoid watering on cloudy days to prevent excessive temperature; pay attention to heat preservation to prevent cold current invasion. In the hot season, deep water is poured in greenhouses and greenhouses, and the floating objects on the surface are taken out, concentrated or buried, and the greenhouses and greenhouses are kept clean. In the flower bud stage, spray the cucurbita, increase the fruit pedicle, promote fruit development, and improve the quality of the cucumber.
(3) Chemical prevention and prevention of drugs When spraying flowers or squash, adding pyrimethanil chlorothalonil to the drug solution can effectively prevent the occurrence of gray mold.
At the beginning of the disease, 40% pyrimethanil chlorothalonil 800-1200 times solution can be used for foliar spraying, and used again 7-10 days apart, 2-3 times in a row.
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