Botrytis cinerea is a kind of disease that occurs every year in the protected cultivation of cucumber. In recent years, the disease has become more and more serious year by year. Because fruits often suffer from infestation and cause rot, peasants are commonly referred to as rot fruit and mold rot.

Cucumber gray mold mostly invade from the defeated female flower, initially produces water-stained lesions on the flower peduncle, gradually grows brown-brown mold layer, causes the flower organ to become soft, atrophy and rot, and gradually expands to the young melon. The diseased department first became yellow, and later produced mildew and gradually turned pale gray. As a result, the diseased melons stopped growing, became soft, decayed and atrophied, and eventually rotted off. The leaves became infected. The lesions began to be water-stained and later became irregular light brown lesions. The edges were obvious, and sometimes the lesions grew a small amount of brown-brown moldy layer. Under high humidity conditions, the lesion rapidly expands to form large lesions 15-20 mm in diameter. After stems become infected, the stems are rotted and the vines are broken, causing rot.

Control measures: 1. Remove the sick body. After the harvest of the Shangyu vegetables, the residue of the diseased plants was completely removed, and the soil was deep-turned over 20 cm. A soil disinfectant plus a new high-fat membrane was sprayed to disinfect the soil to reduce the initial infestation source. Remove diseased flowers, diseased melons, and diseased leaves in a timely manner and take them out of the warm outdoors to reduce the sources of re-infection.

2. Strengthen cultivation management. Strengthen ventilation, water, adequate amount of water, under the film to take dark irrigation, avoid watering on cloudy days; pay attention to insulation, prevent cold currents from attacking; keep the greenhouse clean, often wipe the film, increase the transmittance. Spraying Guomei Kang at the bud stage of cucumber to increase fruit pedicle, promote fruit development and improve cucumber quality. Adjust the temperature and humidity inside the shed to control the infection of pathogens. The temperature in the booth was raised to 31°C-33°C. Exhaust air began to flow beyond 33°C. The temperature was maintained at 20°C-25°C in the afternoon and was closed at 20°C, keeping the night temperature at 15°C-17°C.

3. Smoke application control. Use 10% fast-king agent, 45% chlorothalonil smoke agent or 20% 100-speed smoke agent, apply 200-250 grams per acre. Dispense in the greenhouse in the evening and close the greenhouse immediately after ignition with dark fire. Smoke one night, open ventilation the next day.

4. Dust application control. Sprayed 5% chlorothalonil powder, 6.5% chlorpheniramine dust or 5% Garrinon dust agent in the evening before covering grasshoppers. Spray 1 kg per acre and close the shed overnight after spraying.

5. Spray application control. With 75% chlorothalonil WP 600-800 times, 56% Acetochlor 600 times, 50% Nonglips 1000 times, 65% Trimethasone WP 800-900 Double liquid or 50% acetaminophen wettable powder 1000 times liquid spray prevention in sunny morning, timely ventilation after spraying, reduce the humidity inside the greenhouse.

Frozen Corylphaena Hippurus

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