Cucumber gray mold prevention and control technology

Symptoms: Most of the gray mold of cucumber begins to invade from the female flower that has been defeated. Initially, water-stained lesions are produced in the flower bud, and the gray-brown mold layer gradually grows, causing the flower to soften, shrink and rot, and gradually expand to the young melon. The diseased part of the melon is yellow first, and the white mold is later produced and gradually turns into pale gray, which causes the growth of the diseased melon to stop, soften, rot and shrink, and finally rot and fall 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.

Pathogens and occurrence regularity: The disease is caused by the infection of the fungus, the fungus, Botrytis cinerea. Overwinter or summer over the sclerotia in the soil or by hyphae and conidia on the diseased body. The conditions of Hunchun are suitable, the sclerotia germinates, and the mycelium, spore stalk, conidia are produced, and the conidia are propagated with airflow, rainwater, dew, etc. after maturity. It is easy to be popular under low light, low temperature and high humidity conditions. In the middle and lower reaches of the Yangtze River and the middle and lower reaches of the Yangtze River, the onset period of cucumber gray mold in the protected area is in the period of May. In the weather conditions of continuous rain, insufficient light, low temperature and high humidity, if it is not timely ventilated and light, the incidence is heavy.

Control method

(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) In the early stage of the disease prevention and control of greenhouses, greenhouses can be controlled by the smoke method, the dust method and the biological control method. 1. Smoke method: use 20% keeling smoke agent, 200-250 grams per acre, or use 50% Nongliling smoke agent, 250 grams per acre. Smoked for 3-4 hours. Generally, smoke can be smoked in the evening, and the door and window will be opened and ventilated in the next morning. 2. Dust method: Spray 10% speed-killing dust, or 5% chlorothalonil dust, or 10% fungicide dust in the evening. 1 kg per mu, spray once every 7-10 days, or 2-3 times in the frontier. The above-mentioned fungicides have better preventive effects than the therapeutic effects, and should be appropriately increased after administration. In order to prevent drug resistance and improve drug efficacy, it is recommended to alternate or combine several drugs. 3, biological control According to the Aolioke-Moldproof 300-500 times solution dilution, spray before the onset or early onset, spray every 5-7 days, the number of sprays depends on the condition. When the condition is serious, it should be diluted with 300 times of Aoliq-Mold and sprayed once every 3 days. The application is avoided during the high temperature period, and the optimum application temperature is 20 ° C - 30 ° C.

Important period of control: flowering period and fruit expansion period.

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