Cucumber gray mold occurs almost every year, especially greenhouse vegetables, and enters the winter. If we encounter low temperature and low sunshine weather again, the gray mold can easily spread. The cucumber gray mold directly harms the young melons, leaves and stems. The pathogenic bacteria invade the female flowers that have lost most of the flowers, causing the petals to rot and grow a pale gray brown mold layer, which then spreads to the young larvae and causes the umbilicus to become water-stained. The young flowers quickly become soft, atrophy, rot, and the surface is densely moldy. When a large melon becomes sick, the tissue turns yellow and grows gray mold, and the mold layer turns pale gray. The victim's affected parts stop growing, rot or fall off. The leaf usually consists of exfoliated burnt or broken melons that must be attached to the leaf surface to induce botrytis, a large lesion of 20-50 mm in diameter, nearly circular 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 rot in the stem. In severe cases, it can also cause the melon section to rot and cause the vine to break. Finally, the plant will die.
After several years of observation, the occurrence of cucumber gray mold in greenhouses has a regular pattern. The cucumber fruiting period is the peak period of infection and rotten melon. The optimal temperature is 18°C-23°C and the highest temperature is 30°C-32°C. At 4°C, when the humidity in the greenhouse reaches more than 85%, the condensation of leaf blades lasts long, and if the ventilation is not timely, the gray mold is particularly prone to occur. The pathogens are attached to the diseased body with hyphae or conidia and sclerotia, or remain in the soil for winter. Overwintering conidia spreads with air flow, irrigation, and agricultural operations.
Prevention methods: In daily agricultural operations, when pruning leaves, they should pick up fallen flowers and dry leaves at any time. The cut melons should be collected and brought out of the shed at any time, to the sick leaves, fruit, Diseased flowers should be removed in time and brought out of the shed.
In the case of continuous and continuous weather, drafting should be carried out and proper ventilation should be provided. In the evening, smoke was sprayed in the shed. It can be controlled with 45% chlorothalonil aerosol or 10% sucrose aerosol, 250-350 g/mu, 5-6 points, ignited with dark fire in the evening, closed over the night, ventilation the next morning. Re-smoke 1 to 6-7 days.
Chemical control: 50% quick-inking WP 1000-1200 times, 50% nelliophil wettable powder 1000 times, 40% Shijiale suspension 800 times, 40% pyrimethanil wettable powder 600 times Liquid, 50% acetaminophen wettable powder 600-800 times spray, 7-10 days once, continuous 3-4 times.
When the gray mold is particularly serious, 50% of Kaiser 750 times fluid plus 2.5% of Suspension Reagent 4000 times liquid melon flowers can also be used. Security, friends of melon farmers may wish to try.
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