Symptoms: Brown spot disease is caused by the infection of Pseudocervella spp., which mainly damages the grape leaves. The spot of infection is light brown and irregular keratinous spots at the beginning of the disease. The lesions gradually expand and the diameter can reach 1 cm. The spots turn brownish brown, and then turn auburn brown, with yellowish-green spots on the periphery. In severe cases, the spots are linked to large spots with clear edges. The back of the leaves is ambiguous, and the diseased part is dead in the later period. When the rain is heavy or the humidity is high, brownish-brown moldy matter occurs.
Control methods: 1 Completely remove litter to reduce the source of disease. 3 to 5 degree lime sulfur spray before germination; 2 spraying prevention and control: In severe areas, combined with other disease prevention and control, in June can be sprayed 1 equal amount of 200 times Bordeaux mixture, 7 to 9 months can be sprayed 500 times 50% Carbendazim 600 to 800 times chlorothalonil or 800 to 1000 times 70% thiophanate used alternately and sprayed once every 10 to 15 days. 65% of mancozeb has phytotoxicity on certain grape fruits, more obvious in the north, and the use concentration should be 1000 to 1200 times; 3 rational fertilization, scientific pruning. Increase the use of multi-element compound fertilizers. Strengthen the tree vigor, improve resistance to disease, leave branches in science, and prune in time, air and light on all sides.
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