Cucumber bacterial leaf spot and downy mildew are very similar, but the methods of prevention and treatment are very different. The farmers often delay the prevention due to misdiagnosis and cause losses. First, the difference between the two diseases 1. Lesion shape and size: Bacterial keratoses and downy mildew lesions are polygonal due to the limitation of veins; bacterial keratoses have smaller lesions; and downy mildew is more widespread and spread. Fast, late lesions will be linked together. 2. Lesion color and perforation: Bacterial keratopathia lesions are lighter in color, appear grayish, and later easily cracked to form perforations; downy mildew lesions are dark in color, appear yellow-brown, and not perforated. 3. Characteristics of lesions on the back of the leaves: The diseased leaves were collected and the pathogens were incubated with a heat preservation method and observed after 24 hours. Lesions were water-stained, resulting in milky pus, a bacterial angular spot; lesions grow purple gray or black mold layer, downy mildew. Humidity in the greenhouse, the early observation of the leaves, can distinguish. 4. The degree of transparency of diseased leaves to light: Bacterial angular spot disease is transmitted light perception; downy mildew is not transmitted light perception. 5. Site of Incidence: Bacterial leaf spot disease occurs on both leaves and fruit, while downy mildew mainly affects the leaves. The fruit is affected, and it is initially water-stained. The surface has white bacteria and pus. The disease spreads and discolors to the flesh, which can be diagnosed as bacterial angular spot disease. Second, the two diseases prevention and control 1. Bacterial leaf spot disease prevention and control: the selection of good disease-resistant varieties, such as Jinchun 4. During the onset of disease can be used to prevent and treat medicine The available pharmaceutical agents include DT fungicide, agricultural streptomycin and 10% copper dust. 2. Prevention of Downy Mildew: The agents that can be used are Raymond Manganese Zinc, Rhizoctonia, and Antivirus. Since these three agents have been used for many years, germs have produced varying degrees of resistance to them. Therefore, new agents can be used for prevention and treatment, such as 10% chlorothalonil aerosol, 40% Dalinine suspension, and 72% Precise, 30% Bromide, 72% Cremo, and 69% with good systemic action Ank manganese zinc and so on. The above agents should be used alternately.
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