If you find spots on the leaves of grape, this suggests that unhealthy plants. What kind of ailments manifest themselves as defects and whether it is possible to influence the situation? Pathogens can act as fungi, viruses and bacteria. Color stains depends on the particular disease. Infestations can also result in a change of color.
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Yellow spots on the leaves of grape
Yellow spots on the grapes - a signal that the plant is hit by mildew (downy mildew). The defects appear on the upper side of the lamina, with its reverse side will be visible whitish powdery coating. Disease are exposed to all parts of the plant. Mildew spread by wind over long distances, so if no action is taken, it will be struck by other planting. Soon the leaves die and fall off, and the berries begin to darken and shrivel. Most susceptible to mildew European grape varieties.
Control: swipe treatment fungicides vines. Good effect means "Artserid", "Kuprikol", "do", "Hom", "Kurzat". For preventive maintenance procedure should be carried out before bud break and flowering. Subsequently vine be processed every 14 days, using 1% -th Bordeaux mixture.
Brown and brown spots on the leaves
The appearance of brown spots due to fungal disease - anthracnose. Their edging has a darker color than the core. After some time, the sheet is completely dark and dies. On its stems appear brown education in these areas is also beginning to develop rot. Under the influence of high humidity anthracnose develops rapidly. If the disease affects the stalk, berry crumble quickly.
Control: Treat bush 3% Bordeaux liquid or "PolyChim", "Artseridom", "Previkurom". Carry out the procedure, taking into account the recommendations in the instructions. After 2 weeks, the infected bushes scoop and dispose of by combustion. In order to prevent not ignore spraying grapes before flowering 1% Bordeaux fluid manipulation and repeat every 2-3 weeks.
White spots on the leaves of grape
We found a bright, grayish or ashy spots? Most likely, you are dealing with such diseases as powdery mildew (mildew). Changing the colors of the leaves are not only not its sign. Over time, you'll notice how they wither and fall off, and the fruit will be a light gray powder. Fungal disease of character usually begins to develop when dense plantation. To protect the plant, it is crucial to carry out proper pruning vines.
Control measuresAs soon as the shoots appear strong leaf 3, immediately sprinkle the bushes with a solution of colloidal sulfur. For this purpose, dilute 10 l of water 90 g of material. After completion of flowering perform the procedure again. During the entire growing season you will need 3 times bush dusted sulfur (2 g per 1 sq.m.). If you can not prevent the disease, start treatment, using fungicides. Good results give the following drugs: "Hom", "Kurzat", "Ordan", "Topaz," "fundazol".
Black spots on the leaves of grape
The fact that the grapes are sick Alternaria show necrotic, almost black spots. Over time, the leaves darken, they formed a fungal plaque. The disease affects completely all vine. On berries appear metallic luster. Alternaria develops under conditions of heat and high humidity.
Control measuresSwipe vines spraying of 3% Bordeaux liquid or biologic "Trihodermin". Be sure to refer to the instructions to the drug. To prevent the occurrence of the disease in the fall to eliminate all plant residues. If the leaves, in the interstices of the shoots and petioles, there are many dark spots. At a massive infection of shoots become brittle, grape bunches are eliminated. Development of blight contributes to raw, rainy weather, thickening landings and lack of ventilation.
Control: Eliminate fallen leaves, cut and burn infected plant parts. Disease can be prevented by treatment with a 1% solution of liquid Bordeaux. After 7 days, repeat the procedure. Carry out regular inspections of the plant. If you find signs of illness, treat the bush 1% solution of liquid Bordeaux.
Red spots on the leaves of grape
Red spots - the result of an illiterate approach to growing plants. Their appearance is connected with rubella, which can carry infectious and non-infectious character. The disease has an effect if it experiences a deficiency of potassium. It can also provoke drought and cold.
Control measures: Fertilize the soil with potassium fertilizer, spend three times spraying bushes bushes 1% - potassium nitrate. The best time for such procedures - early morning or late evening.
The red-brown coloration may result from damage to the plants or felt spider mite. In white grape varieties in this case have yellow spots. And if on the upper side of the leaf blade you find tuberosity and bottom pink or brown pubescence, it says that the bush attacked by mites grape tick.
Control measures during vegetation vine treat acaricides. You can use the following medications: "Neoron", "B-58", "konfidor", "Piridabenom". In the fall of all crop residues need to be uninstalled.
rusty spots
The fact that the plant is affected by rust spots indicate characteristic yellow-brown and rust-colored. In addition, they will be visible fungal spores.
Control: Spray the bush preparation "strobe" in 10 liters of water dissolve 5 g of material). After 10-14 days, repeat the treatment.
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