Continued cloudy days, coupled with the effects of low-temperature and low-light weather, the greenhouse cucumber botrytis began to spread. In the cucumber wholesale market in Qudi Town, Jiyang County, Shandong Province, several farmers who sell melons have reported that on the past few days, greenhouse cucumber botrytis began to occur, and it was particularly serious. Since Tianyin cannot fight drugs, only aerosols are used and the control effect is not ideal. On November 27th, the wholesale price of cucumbers came to 3.50 yuan/kg. With such a high price, the farmers were happy to be happy. However, the death of this gray mold would be a direct rotten cucumber. This is tantamount to rotten farmers' money. Therefore, they urgently need to understand how to control gray mold. 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. Cucumber Botrytis cinerea directly harms young cucumis, leaves, and stems. The pathogenic bacteria invade most of the female flowers that have lost their sustenance, causing the petals to rot and grow a pale gray brown mold layer, which then spreads to the young larvae, causing 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. Cucumber fruiting period is the peak period of the disease infection and rotten melon, the incidence of optimum temperature of 18-23 °C, the highest 30-32 °C, the lowest 4 °C When the humidity in the greenhouse reaches more than 85%, the condensation of the leaves lasts long, and when 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. 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 severe, 50% of Kaiser 750 times fluid plus 2.5% of Suspension 4000 times liquid melon flower can be used. Those cucumbers that have been used for flowering must not be gray mold. Guinong friends may wish to try. Shenzhen Sunson Tech Co., Ltd , https://www.sunsonkiosk.com
Control methods: In the daily agricultural operations, when pruning leaves, they should pick up the lost and dried leaves at any time. The broken melons should be collected and brought out of the shed at any time, and they must have the diseased leaves and fruit. Diseased flowers should be removed in time and brought out of the shed.