MySheen

How to control brown spot in grape planting

Published: 2024-11-22 Author: mysheen
Last Updated: 2024/11/22, Symptoms: Brown spot disease is caused by infection of Pseudocercospora viticola, mainly damaging grape leaves. The infection point is light brown and irregular angular spots at the initial stage of disease. The disease spots gradually expand, the diameter can reach 1 cm. The disease spots change from light brown to brown, and then turn reddish brown.

Symptoms: Brown spot is caused by Pseudocercospora grape infection, which mainly damages grape leaves. At the initial stage of the infection, the infection spot shows light brown and irregular angular spots, and the spot gradually expands, up to 1 cm in diameter. The spot changes from light brown to brown, and then turns to reddish brown, the periphery is yellowish green, and in severe cases, several spots are connected into large spots, the edges are clear, the back of the leaves is blurred, and the disease part dies in the later stage. Grayish brown mildew occurs when it is rainy or humid.

Control methods: ① thoroughly remove litter to reduce the source of the disease. Spraying 3-5-degree stone-sulfur mixture before germination; ② spraying control: in areas with serious disease, 200 times Bordeaux can be sprayed once in June, 500-fold carbendazim, 600-800-fold chlorothalonil or 800-800-fold thiophanil can be sprayed alternately every 10 to 15 days. 65% mancozeb is harmful to some grape fruits, especially in the north, and the concentration should be 1000-1200 times; ③ should be fertilized reasonably and pruned scientifically. Increase the application of multi-element compound fertilizer. Enhance the tree potential, improve disease resistance, scientific retention of branches, timely heart pruning, ventilation and light on all sides.

 
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