Fighting diseases of grapes

Brown spots appeared on grape leaves, many of them twisted. What is this disease and how to deal with it?
It is important to know at what point they appeared. Brown spots (necrosis) are dead leaf cells. Causes can be different.
1. Sometimes in the form of stains, Mildy disease is manifested (photo 1 and 2). This is not characteristic of all varieties, but as an option is quite possible;
2. Those may look like traces from burns by pesticides - with overwhelmed concentrations of the solution, poor splashing (for example, broom), plant processing in hot sunny weather, as well as when the fluid is accumulated on the leaves. Pesticides can get to grapes and when processing neighboring beds into windy weather;
3. The appearance of stains may arise due to lack of batteries. Yellow foci appears on the leaves (chlorophyll destroys), and only then the stains are darker. By the way, signs of a shortage of the same element in different grape varieties can be completely different. Therefore, it is difficult to give any universal recommendation. Typically, stains are developing either through the veils of the sheet, or, on the contrary, between them (photo 3 and 4).
If the grapes fell ill with mildew, it is necessary to process it with fungicides: burgundy liquid, dellated, ridomy-scrap or others. If not enough food - adopt. The benefit is now sold a lot of fertilizers with trace elements.
If you have a tearless grape variety (Minsk pink, purple august, Zilga, Supag, Sukribe, Yodupe, etc.), then it can really not be covered by winter. If the variety is observed, then every winter, in spite of the age, or on the size, it must be stolen. When storing a product from grapes, a warehouse should be conducted to save on electricity consumption. Moreover, such varieties need to be thoroughly cut so that they do not grow strongly (especially the long-term wood). Then they retain their flexibility, which allows you to put them on the ground.
If you can eat, cover the grapes for the winter or at least just remove from the cholera and put it on the soil. It is only an additional guarantee that the plant will penetrate well.