Recently, in the investigation of Guanzhuang Village in Liuhaizhuang Township, Gaocheng City, it was discovered that due to the continuous cultivation of greenhouse cucumbers for many years, the disease has been aggravated year by year, especially the incidence of cucumber wilt disease has seriously affected the yield and quality of cucumber.
First, the symptoms
At the beginning of the disease, the lower leaves chlorotic, and there are yellow spots in the veins along the veins. They wilted during the day and recovered at night. They gradually developed into the upper leaves, which seemed to lack water, and finally the whole plant died. The base of the diseased stem is dull, slightly yellowish, sometimes with longitudinal cracks, secrete glial material, and grows pink or pink moldy under high humidity. The main or lateral roots are dark brown dry rot. Dividing the lower diseased stem shows that the vascular bundles turn yellow-brown. This feature can be distinguished from other wilting diseases such as diseases, blight, sclerotia, and the like.
Second, comprehensive prevention and control measures
1. Selection of disease-resistant varieties: There are differences in the resistance of different varieties, and selection of disease-resistant varieties can play a multiplier role. If noisy No. 1 cucumber is suitable for planting in spring and autumn greenhouses, it can resist diseases such as cucumber wilt and downy mildew.
2. Seed disinfection: 50% carbendazim 500 times solution soaked for 1 hour, and then washed and germination.
3. Soil disinfection: Nursery should choose new soil without pathogenic bacteria as bed soil, using plug or nutrition seedlings. Live stilts were taken live in order to minimize the damage. When garden soil is used as bed soil, it should be disinfected and 50% carbendazim wettable powder can be used to treat bed soil. Protected areas such as greenhouses and greenhouses can also use the hot summer season to plow the soil and close the greenhouse for 10 to 15 days. Solar energy is used to raise the temperature and disinfect the soil.
4. Grafting prevention and control: The cucumber in the protective field adopts the white (yellow) seed pumpkin as the rootstock for grafting cultivation, which is the most effective method to solve the problem of cucumber double cropping and wilt disease.
5. To strengthen the cultivation and management: to strengthen the cultivation and management, so that plants grow robust and improve disease resistance. Sorghum cultivation is generally used to help reduce disease occurrence. Spread mulch or straw, strengthen ventilation, reduce ground temperature, prevent flooding, and protect the root system. In the field, the diseased plant was found dead and should be immediately removed, buried or burned. After removing the stubble, we must remove the residual leaves of the field diseased plants and do a 3 to 5 year rotation on the plots where the field health blight occurs.
6. Chemical control: 50% carbendazim 500 times solution, 50% thiophanate-methyl 1000-time solution, 70% dexamethasone 1000-1500 times solution and other pesticides can be used for the prevention and treatment of the initial stage or incidence of cucumber. The effect is significant. Early detection, early prevention and early treatment are effective. It can be used for 7 to 10 days, irrigation, and irrigation for 3 times. The drugs should be used interchangeably.
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