Specific drug for grape brown spot

At the initial stage of the disease, 50% carbendazim soluble powder can be sprayed 1500 times, or 50% carbendazim 200 times Bordeaux solution, or 50% carbendazim wettable powder 700x liquid; when the disease is serious, it can be sprayed once with equal volume of 200x Bordeaux, or 500x carbendazim, or 600,800x chlorothalonil, once every 10-15 days. Clean the orchard thoroughly after autumn, burn or bury the fallen leaves, and spray 3-5 degrees stone sulfur mixture before germination.

1. Brief introduction of grape brown spot

Grape brown spot disease is also called spot disease, brown spot disease, leaf spot disease, angular spot disease and so on. Large brown spot and small brown spot are mainly harmful to the middle and lower leaves. The lesion diameter of 3-10 mm is large brown spot, and the diameter of disease spot 2-3 mm is small brown spot. It usually occurs at the beginning of May and June, and the peak period is from July to September, and the disease is more serious in rainy years. When the disease is serious, the leaves can fall off 1-2 months earlier, seriously affecting the tree potential and the fruit of the second year.

Symptoms of grape brown spot

The main results are as follows: 1. Large brown spot is caused by Pseudocercospora grape infection. At the beginning of the infection, the infection site shows light brown, irregular horny spots, and gradually expands, with a diameter of up to 1 cm, from light brown to brown, and then to reddish brown, the periphery is yellowish green, in severe cases, several spots are connected into large spots, the edges are clear, the back of the leaf is blurred, the disease dies in the later stage, and grayish brown mildew occurs when it is rainy or humid. The disease spots of some varieties have inconspicuous wheel patterns.

2. The small brown spot was caused by the parasitism of Cercospora fasciculata. The infection spot appeared yellow-green small round spot, which gradually expanded to a round spot of 2Mel 3mm. The spot gradually withered and became brown and then tea brown, and the black mildew layer appeared on the back of the leaf in the later stage.