Prevention of raisin leaf disease

Grape leaf blight, also known as dry leaf disease, is a physiological disease that can cause debilitating tree vigor and severely affect the quality of the fruit and its output next year.

Most of the grape leaf blight occurs suddenly in large areas. At the beginning of the leaf blade, water stains were dark green and blue and dry. After one day, the diseased part was yellowish-brown, and there was a circle of dark green blue and dry from the outside to the inside. Even if the soil water content did not reach the wilting coefficient, it would not happen. The rain will not spread quickly if it is not watered. Bacterial wilt develops from the edge of the entire leaf to the heart of the leaf, and the entire plant is affected. The disease is severe at sites where light is strong. For example, when the branches climb to the north of the shed, the incidence is heavy at the junction of the shelf.

First, after the rainy season, we must pay close attention to the growth status of the new shoots. When the tip of the new shoot is hard-bent, there should be no water shortage. If the young shoots are upright and soft, the edges of the big leaves will droop and the water-dropping performance should be immediately poured. water. In order not to produce cracks, do not use water at too large a time or spray water on the leaves. Second, after the rainy season, it is necessary to loosen soil in time to prevent soil compaction and enhance the water retention performance of the soil. Third, increase organic fertilizers every year to improve the physical and chemical properties of the soil.



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