Cucumber gray mold is a disease that occurs in cucumber cultivation in the past years. It has been increasing year by year in recent years. Because fruits are often infected and cause rot, vegetable growers often call it "rotten fruit disease" or "mold disease."
Cucumber gray mold often invades from the edge of the leaf
Cucumber gray mold often invades from the defeated female flower, initially produces water-stained lesions in the flower bud, gradually grows the gray-brown mold layer, causing the flower to soften, shrink and rot, and gradually expand to the young melon. The diseased department first became yellow, and the white mold was later produced and gradually turned into pale gray, which caused 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 to 20 mm. After the stems are infected, the stems rot and the melons are broken, causing rotten sputum.
Cucumber gray mold infects leaves into "V" shaped lesions
Cucumber gray mold infested young fruit symptoms
Prevention points
1 Strengthen cultivation management: keep the shed surface clean, enhance the light, avoid watering in the rainy days, and prevent flooding of the water. It is best to choose watering on a sunny day.
2 sheds release air in time to reduce air humidity.
3 Clear the sick body: timely remove the diseased fruit, put it in a plastic bag, take it out of the shed and destroy it indoors to prevent the bacteria from infect again.
4 chemical control: in the early stage of the disease, use 50% Pythium WP 1500 times, or 50% keeling WP 1500 times, or 50% phlegm WP 1500 times, or 75% chlorothalonil wettable powder 600 times liquid, or 50% more moldy wettable powder 1000 times liquid spray control, every 7 to 10 days, continuous 2 to 3 times, pay attention to rotation. In the cultivation of protected land, 45% chlorothalonil or 10% procymidone can be used, and 200-250 grams per acre is used. After being ignited with dark fire in the evening, it is smoked overnight and the door is opened for ventilation the next day.
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