MySheen

Introduction to the symptoms of grape brown spot

Published: 2024-11-22 Author: mysheen
Last Updated: 2024/11/22, Symptom identification: it is a fungal disease, which is mainly harmful to leaves, which is divided into large spot and small spot, which is caused by two kinds of diseases. At the initial stage of the occurrence of large brown spot, round or polygonal disease spot is formed around the leaf veins, the disease spot is brown to dark brown, the edge is reddish brown, and there is a yellowish-green halo around the spot, gradually expanding to form brown.

Symptom identification: it is a fungal disease, which is mainly harmful to leaves, which is divided into large spot and small spot, which is caused by two kinds of diseases. At the initial stage of the occurrence of large brown spot, round or polygonal disease spots are formed around the leaf veins, the disease spots are brown to dark brown, the edges are reddish brown, and there are yellowish-green halos around the spots, gradually expanding to form concentric rims of different brown shades. When the humidity is high, there are black-brown mildew clusters scattered on the surface or back of the disease spot, and several spots are connected to form large spots, and the disease tissue is ruptured and withered in the later stage. The size of the small spot is relatively similar, the spot is dark brown, and the brown mildew layer is produced on the back of the spot in the later stage.

 
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