Introduction to the symptoms of grape brown spot
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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Introduction to the prevention and control of grape black pox
1. Eliminate the source of bacteria. After falling leaves in autumn, the fallen leaves and diseased ears are removed and buried deeply, and the old bark scraped off should be burned immediately. When the grape bud scales sprout in spring, spray Baume 3-5 degree stone sulfur mixture + 0.3% pentachlorophenol sodium. 2. Strengthen the cultivation and management. Combined with summer pruning, carefully cut off diseased branches, diseased leaves and diseased fruit.
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How to control grape brown spot disease?
Grape brown spot disease began to occur from the lower leaves of the plant and gradually spread upward. It can occur from June to November, and the peak period is from July to September. Rainy years and poorly managed vineyards occur severely. Control methods: 1. After autumn, thoroughly remove orchard leaves, reduce or eliminate overwintering disease sources. During the grape growing season...
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