[Symptoms] The main damage leaves. The leaf spot was nearly brownish brown, with unequal sizes (2-15 mm in diameter), with obvious or indistinct markings on the surface, and a large sharp tip of the black granules (disease conidia). The later lesions faded from gray-brown to gray-white with dark edges and dark brown to reddish-brown. The lesions became thin and easily broken, or part of the lesions fell into perforations.
[Pathogen and Pathogenic Characteristics] The pathogens are Phyllostictapha-seolina Sacc. and P. dolichi Brun. The two bacteria belong to the same genus and are of different species. They both live through winter with the mycelium and the spore-spore device as the diseased body remains in the soil, and endogenous spores are used as the primary invasion and re-invasion inoculation, and are transmitted through rain spatter from the wound. Or the epidermis directly invades the disease. Rainy years or seasons are good for disease. The difference in disease resistance between varieties is unknown.
[Control methods]
(1) Look for species that are resistant (resistant).
(2) Strengthen the management of fertilizer and water, spray foliar nutrient at the right time to promote stable growth and stability, and enhance resistance to disease.
(3) timely spraying prevention and disease control. After spraying, 75% chlorothalonil + 70% thiophanate (1:1) 1000 times solution, or 40% triadimefon carbendazim 1000 times, or 60% anti-mildew treasure ultra-wet powder 800 times liquid, or 30% copper oxychloride suspension + 70% mancozeb (1:1, ie, mix and spray) 800 times, 2-3 times, every 10 days or so. Alternate spraying, spray evenly.
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