Why do grapes have bright leaves
Like other berries, grapes are susceptible to diseases that can cause light leaves in grapes. Normally, the leaves should be saturated light green or green.
Why do grapes have bright leaves
The reasons for this condition
There are many reasons for grape leaves to lighten. Some of them are solved locally, some are complex, by fertilizing and fertilizing the soil.
In this disease, the grapes first turn pale, then turn yellow. The disease affects the plant in a week. It becomes a little chlorophyll, the leaves turn yellow due to the inability to process carbon dioxide.
Reasons why young grapes have pale leaves:
- lack of trace elements;
- lack of nitrogen;
- fungal, infectious diseases;
- adverse weather conditions.
If a pale grape leaf appears, treatment should be started immediately.
Depending on the reason, choose a method: the introduction of compensating substances in the soil or solutions with the necessary substances:
- If chlorosis is carbonate (from excess lime in the soil), 3 kg of ammonium sulfate are added to 1 bush.
- If the cause of the disease lies in fungi or infections, a solution of iron sulfate (50 g per 10 l of water) is prepared, watered under the root.
- Pale and healthy are sprayed for 2 weeks with a solution of iron chelate. It is prepared by adding 5 g per 10 l of water.
Running chlorosis is not treated in a month. In case of neglect, the immune system weakens, it becomes vulnerable to infectious and viral diseases.
Spotted mosaic causes infectious chlorosis. Nematodes are its carriers (the path of infection is through the soil and from other plants).
Signs of the disease:
- veins turn yellow;
- yellowness passes to a leaf plate;
- becomes brown, curls and falls away, drying up.
Spotted mosaic is incurable.
It is also dangerous because it transfers to other plants. The affected bushes are uprooted and destroyed, and the soil is disinfected from nematodes.
Light yellow grapes become affected by the following fungal diseases:
- powdery mildew (oidium);
- downy mildew (mildew).
Infected bushes require treatment with special preparations against fungi. During the procedure, put on a respirator and work in replaceable clothes.
A disease can kill a plant
These solutions wipe or spray sheet plates from 2 sides. This treatment is carried out several times per season. After heavy rain, the procedure is repeated. Prescriptions for drugs:
- Lime and sulfur broth. Take 1 part quicklime, 2 parts sulfur and 17 parts water. Sulfur is mixed with water to the state of the test, lime is quenched with water. All mixed in one container and boiled for an hour. Dilute with water before use.
- The ash solution enriches the soil and helps in the fight against fungi. In 2 l of water for 3 days soak 1 l of ash. Before use, add 4 liters of water and begin processing the bushes. The mixture is poured into the furrows between the bushes of berries.
The lack of minerals and trace elements
Compounds of nitrogen, molybdenum, boron, manganese and zinc are considered important for grape health. The lack of these substances makes the plates light green, with yellow veins.
In the case of a lack of nitrogen, the leaves of the grapes change color to light green, the petioles become thinner, turn red. Over time, the affected areas die and fall away. In case of a lack of nitrogen, fertilizing is done.
The concentration of the solution depends on the period:
- At the beginning of summer, a concentrated urea solution (80 g per 10 l) is added.
- At the end of summer, the concentration is reduced to 15 g per 10 liters.
Zinc is responsible for redox processes. During the lack of an element, green plates cover spots of a metallic shade or a mosaic of the same color.
The problem is solved by introducing foliar solutions of zinc oxide or zinc chelate.
Boron is needed for the reproductive ability of the plant. Its lack is also reflected in the appearance of the culture: green leaves turn into light, even shine through, brown streaks appear. The plant does not bear fruit well: ovaries do not appear, shoots weaken. The shortage is made up by foliar bait with substances with boron.
Manganese is important for berries. He is involved in the process of photosynthesis, tissue regeneration, assimilation of nutrients. With its deficiency, green plates become covered with yellow spots, which merge into conglomerates and lead to death. To replenish the substance, foliar treatment with manganese sulfate is carried out.
To avoid pale green parts of the bush, carry out prophylaxis. Avoid top dressing the bush and fertilizing the soil with the following substances:
- fresh manure;
- nitric acid compounds of sodium and calcium;
- large doses of superphosphates.
These fertilizers cause an alkaline reaction, due to which the grapes brighten.
The leaves of the grapes may become lighter due to problems in the development of the crop. Light areas appear due to deficiencies of trace elements and minerals, as well as due to infectious diseases and fungi.
Some ailments are incurable, and some require adjustment of soil conditions or crop health. So that the pale areas do not appear, it is not recommended to introduce fresh manure, a large amount of superphosphates and a compound of sodium and calcium into the soil.