Cucumber leaf blight symptoms of disease, mostly from the edge of the onset of the disease, the formation of tan to brown "V"-shaped lesions, dense black spots, dry and easy to break. Stem infected, mainly in the stem base and stem sections and other parts, the initial generation of oil-like small lesions, gradually expanding around the stem after half weeks to week, vertical up to tens of centimeters, the Ministry of dense black spots, late The lesion turns tan. When the humidity in the field is high, the diseased department often bleeds out of the amber-like glial substance, and after drying, it breaks vertically and causes the stems and leaves above the diseased part to wither. The disease has a small black spot in the diseased area as the main distinguishing feature. After the onset of the stem, the epidermis tends to tear, causing the melon to die, but the vascular bundle does not change color and does not harm the roots. It can be distinguished from the wilt disease.
The pathogenic bacteria of the cucumber bacterial wilt pathogens are mainly wintered in the soil by conidiospores or ascospora shells with the diseased bodies, and the seeds can also spread with bacteria. When conditions in late spring are suitable, the bacteria invade from water holes, stomata, and wounds, causing morbidity. Infested by fungal Ascomycetes submucosal melon. The pathogens mainly live in the soil with conidiospores or ascospora shells in the soil, and the seeds can also spread with bacteria. Bacteria like warm, high humidity conditions, suitable temperature 20 °C -25 °C, relative humidity more than 85%. Conservation cultivation is not timely ventilation, planting density is too large, lack of light, the incidence of heavy air humidity when the disease is heavy. Explosive cultivation occurs mainly in the summer and autumn rainy seasons, and is often popular under conditions of climatic conditions such as heavy rain or sudden rain, and hot weather. Cultivation of flat ridges, poor drainage, lack of fertilizers, and poor growth of melon pods will aggravate the condition. The incidence of cucumber bacterial wilt in Zhejiang and the middle and lower reaches of the Yangtze River is May to June and September to October.
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