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 seriously. Prevention and control methods: 1. Completely remove the fallen leaves of the orchard after autumn to reduce or eliminate the source of overwintering disease. During the period of grape growth, attention should be paid to orchard drainage, reduction of orchard humidity, timely pruning, strengthening ventilation and light transmission, and appropriate application of organic fertilizer to promote tree growth and improve plant disease resistance. two。 Master spraying in the first half of the year, and then every 10-15 days, according to the condition and climatic conditions, a total of 2-5 times throughout the year. 65% mancozeb 800-fold solution, 70% mancozeb 800-fold solution, and 1-type Bordeaux solution are used alternately.
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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 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.
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Summer Management of Grape
There are many diseases in some vineyards in summer, such as grape downy mildew, white rot, anthracnose and so on. Downy mildew can cause fallen leaves, withered branches, rotten fruit and even death. Therefore, Liu Zhongtang, an agronomist of Weixian Agriculture and Animal Husbandry Bureau, reminded the broad masses of fruit farmers in the rainy summer season during the technical training in the township.
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