Cucumber gray mold occurs almost every year, especially after winter, if you encounter low temperature and low weather, gray mold is easy to spread. Cucumber gray mold directly affects young melons, leaves and stems. The pathogens invade from the defeated female flowers, causing the petals to rot, and grow a light gray-brown mold layer, which then spreads to the young melons, causing the umbilical part to be water-stained. Young flowers quickly soften, shrink, rot, and the surface is densely layered. When the larger melon is sick, the tissue turns yellow and gray mold, and the mildew layer becomes pale gray, and the damaged part of the damaged melon stops growing, rots or falls off. The leaves are usually caused by detached burnt flowers or broken melons attached to the leaf surface to cause gray mold, forming large lesions with a diameter of 20-50 mm, nearly round or irregular shape, obvious edges, and a small amount of gray mold on the surface. When rotten melon or burnt flower is attached to the stem, it can also cause the rot of the stem. In severe cases, the vine will be rotted and the vine will break, and finally the plant will die.
After several years of observation, the occurrence of greenhouse cucumber gray mold can also follow the rules. The cucumber melon period is the peak period of the disease infection and rotten melon. The onset temperature is 18~23°C, the highest is 30~32°C, and the lowest is 4°C. When the humidity in the greenhouse reaches 85% or more, the leaf dew condensation lasts for a long time, and the wind is not timely, and gray mold is particularly prone to occur. The pathogen is attached to the diseased body by hyphae or conidia and sclerotia, or left over in the soil for wintering. Wintering conidia spread with airflow, watering and farming operations. Linyi Fertilizer Network Copyright
Control method: During the daily farming operation, when the whole branch is threshed, the fallen and dried leaves should be picked up at any time. The cut melon should be collected and taken out of the shed at any time, and the diseased leaves and diseased fruits are The diseased flowers should be removed in time and taken out of the shed for deep burial. Linyi Fertilizer Network Copyright
In case of continuous continuous cloudy weather, it should also be drafted and properly ventilated. In the evening, the aerosol was sprayed in the shed. It can be treated with 45% chlorothalonil aerosol, or 10% keeling aerosol, 250-350 grams per 667 square meters, 5 to 6 places, ignited with dark fire in the evening, closed overnight, and ventilated the next morning It will be smoked once every 6 to 7 days. Linyi Fertilizer Network Copyright
Chemical control: 50% speed Keling wettable powder 1000~1200 times solution, 50% Nonprofit wettable powder 1000 times liquid, 40% Shijiale suspension 800 times liquid, 40% pyrimethanil wettable powder 600 times Liquid, 50% chlorhexidine WP 600~800 times liquid spray, 7~10 days, for 3~4 times. When gray mold is particularly serious, it can also be used with 50% Kaiser 750 times solution and 2.5% Shile time suspension agent 4000 times liquid melon flower. Linyi Fertilizer Network Copyright
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