(1) Symptoms: Grape brown spot disease is also called spot disease. There are two types of brown spot and small brown spot. After the lesion is shaped, a diameter of 3-4 mm is called a large brown spot. The symptoms vary from species to species. On the grapes of the American system, the lesions are irregular or nearly round, the middle is dark brown, the outer is brown, the edges are reddish-brown, and the dark brown on the back has a dark brown moldy layer. When heavy, leaves dry and cracked and easily fall; but in Longan and Jiazhou, the lesions are round or triangular in shape, with black circular rings in the middle, brown edges, and the outermost layer is dark and moist. After the lesions are shaped, the diameter of 2-3 mm is called small brown spot, the color in the middle of the lesion is slightly shallow, and the back surface is longer than the layer of black mold. (2) Incidence of disease: Brown spot pathogens mainly live in fallen leaves. In the spring of next year, the wintering bacteria spread through air currents and rain, and invaded through the dorsal stomata. The incubation period is generally about 20 days. The northern part of the disease began in June, during the onset of recurrence of repeated infections, 7-9 month into the peak period. The disease gradually spreads downward from the lower leaves of the plant. Heavy rainfall in areas and years of heavy rainfall caused early defoliation, affecting yields and weakening tree vigor. (3) Control measures: 1 Spray protection. In the early stage of disease, combined with the control of black pox and anthrax, spraying 1:70:200 or more 65% zedoary zinc wettable powder 500-600 times liquid. Spray once every 10 to 15 days, even spray 2-3 times, better control effect. As the disease spreads from the bottom up, the first and second sprays should focus on protecting the lower leaf. 2 strengthen the cultivation and management. Thoroughly clean the leaves after the fall to reduce the source of overwintering bacteria. During the growing season, organic fertilizers should be added to help the tree grow robustly. Drain the water in time and lower the temperature.
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