Winter greenhouse cucumber gray mold prevention and control measures

Cucumber gray mold occurs almost every year, especially in greenhouse vegetables. It enters the winter, and if it encounters 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. When it is serious, it can also cause the rot of the melon to cause the vine to break. Finally, the plant is dead. Related reading: How does the dead seedling grow in the greenhouse?

After several years of observation, the occurrence of cucumber gray mold in greenhouse is also ruled. The cucumber melon period is the peak period of the disease infection and rotten melon. The onset temperature is 18 °C~23 °C, the highest is 30 °C~32 °C, the lowest. At 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. Control method: During the daily farming operation, when the whole branch is threshed, the fallen flowers and dry 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.

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 acre, 5 to 6 places, ignited with dark fire in the evening, closed overnight, and ventilated the next morning. Smoked again 6 to 7 days.

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, 50% Kaiser 750 times liquid plus 2.5% Shile time suspension agent 4000 times liquid melon flower can be used. Any cucumber that has been smashed with flowers is basically not gray mold, not only good control effect, but also Safety, melon farmers may wish to try, recommended reading: cucumber downy mildew HD pictures and prevention methods.

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