How to Prevent and Control Grape Leaf Blight? A Full Analysis of Practical Methods
Grape leaf blight starts on the lower leaves of the plant and gradually spreads upward. It can occur from June to November, with July to September being the peak period. It is severe in rainy years and in poorly managed vineyards. Prevention and control methods: 1. After autumn, thoroughly clear away fallen leaves in the vineyard to reduce or eliminate the overwintering source of the disease. During the grape growing season...
Grape leaf blight starts on the lower leaves of the plant and gradually spreads upward. It can occur from June to November, with July to September being the peak period. It is severe in rainy years and in poorly managed vineyards.
Prevention and control methods:
1. After autumn, thoroughly clear away fallen leaves in the vineyard to reduce or eliminate the overwintering source of the disease. During the grape growing season, pay attention to vineyard drainage, reduce humidity in the vineyard, prune in a timely manner, improve ventilation and light penetration, and appropriately increase the application of organic fertilizer to promote vigorous tree growth and improve the plant's disease resistance.
2. Spray half a month before the disease normally occurs, then spray once every 10 to 15 days, for a total of 2 to 5 sprays per year depending on the disease situation and climatic conditions. Alternate the use of 65% zineb 800-fold solution, 70% mancozeb 800-fold solution, and 1:0.5:200 to 240 Bordeaux mixture.