Cucumber blight is a kind of soil-borne disease, and the incidence of autumn cucumber in the north is heavier. The occurrence of an epidemic can cause a large area of ​​cucumber deaths, and the reduction of production by about 30% is the main disease of autumn cucumbers.
Cucumber disease can occur during the whole growth period in summer and autumn. The tender stems in the seedling stage are immersed in water, rapidly expanding and softening, shrinking, and dying, and do not fall down. The adult plants are often infected with tender stems, and the diseased part is flooded. The upper part of the plant is wilting and a large round lesion is formed on the leaves. The diseased parts of the fruit are rotted and sag, and the surface produces white mold that spreads odors, causing abnormal cucumbers and falling off of young cucumbers.
Bacteria can spread through irrigation and field operations, and high-humidity environments and low-lying land are especially susceptible to disease.
Prevention can be a reasonable rotation, as far as possible in the gargle arrangements to avoid heavy weight or continuous production with vegetables. It can be used for rotation in cross-breeding crops of leguminosae and leguminous crops for 2-3 years to reduce disease. The use of disease-resistant varieties is the best way to use seed soaked with warm soup or grow bacteria-free seedlings to increase the resistance to the bacteria. The use of pumpkins, especially grafted black seed pumpkin rootstocks, can effectively prevent the occurrence of diseases.
Strengthen field management, use high and narrow ridges for colonization, and improve ventilation conditions. General ridge height 15-20 cm, ridge width 30-40 cm, wide ridge distance 80-90 cm, narrow ridge distance 40-50 cm. The density is 3800-4000 strains per mu. During the growing period, the diseased plants were removed in time, the diseased leaves were removed, and the dead leaves, rhizomes and weeds were removed after harvest, which reduced the sources of infection of the melons and vegetables. Using drip irrigation and under-membrane irrigation, flood irrigation is prohibited and water accumulation is avoided. Watering is reduced to the minimum amount at the onset to control the spread of the disease. The mulch prevents bacteria from attaching stems, leaves and fruits. Nitrogen, phosphorus and potassium fertilizers are used in reasonable towers to avoid partial application of nitrogen fertilizers. After the onset of the disease, 58% of thiram Mn-Zn wettable powder was sprayed 500 times, sprayed once every 5-7 days, sprayed 3 times, and the drug was stopped 10 days before harvest.
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