Good harvest of grapes on own site – the true pride of the summer resident. Here only that the plant grew at healthy and has yielded fruits, it is necessary to work. The complex of nutrients, water, the sun, suitable weather, protection against infections are required for rod. Pale leaves at grapes have to guard the gardener, it can be signal of serious disease of plant.
Nitric starvation
Many summer residents ask questions why leaves at grapes brighten what to do and than to feed up plant. It is not accidental: the deficiency of mineral substances becomes the frequent reason of lighting of foliage. The problem is solved by introduction of certain fertilizers. Nitric starvation – the most frequent disease of grapes.
At the shortage of nitrogen at bush light green leaves are observed: at first streaks, then all sheet plates in the lower part of plant turn pale, scapes redden. If not to feed up bush, he gradually all will turn pale, will turn yellow later and will grow brown. It is necessary to introduce in zone of power supply of rod complex mineral fertilizer with nitrogen, potassium and phosphorus; urea; humus. So, urea is brought in soil in the form of solution (30-50 g on 10 l of water) and in addition used for sprayings (1% solution).
Deficiency of iron
The shortage of iron – one more frequent reason of, why pale leaves at grapes. At plant has developed chloroz, that is the chlorophyll in foliage is badly formed. At the same time lose rich green color and escapes, and decolorization of rod happens from below top.
The lack of iron is compensated by spraying of bush iron vitriol (rather 0.2% solution). If not to fill shortage, the harvest of grapes will become poor, the started rod will cease to yield fruits.
Lime surplus in soil
Bad weather, cold weather and rains can be the cause of pale leaves at grapes. At moisture surplus to bush does not gasp, the plant can even decay. If in the soil there is a lot of lime, under the influence of water the alkaline reaction as result can begin, grapes will receive less nutrients, the same iron.
The plant gets sick with limy, or carbonate chloroz. At stagnation of water it is necessary to arrange drainage, for example, from crushed stone. As treatment fertilizer which will not increase alkaline reaction in the soil, for example, sulfate ammonium is introduced. For fertilizing the complex of fertilizers with substances which will help grapes to acquire iron better is necessary: pine forest, zinc, manganese, magnesium.
Lack of lighting
Sometimes pale grape leaves and escapes – only the investigation of bad illumination. The plant needs to give more light, and as soon as possible! For this purpose it is required to thin out high vegetation, to push aside the obstacles closing grapes from sunshine.
Perhaps, the cardinal decision – change of bush to the place, more suitable for this grade, will be required. At cultivation of plant in the greenhouse it will be required to equip the room with additional lighting.
Frosts
If in site zone where the rod grows, has suddenly sharply become cold, it can become explanation of too why light green leaves at grapes which pleased with juicy-green thickets earlier. So happens if foliage hardly has managed to be formed then have struck frosts.
The sheet plates which have endured cold can lose absolutely color, to become spotty. Affected leaves are recommended to be removed.
Infectious disease
Leaves of grapes begin to brighten, at the same time yellow streaks appear? It is possible that grapes have caught infection. Often the disease of this plant is caused by virus of spotty mosaic which is carried by roundworms. Sick sheet plates become covered by spots, are twisted and dry.
The sick bush needs to be rooted out and burned urgently away from the site, and the soil to subject disinfection from roundworms – to steam or process special means according to the instruction on packing. So, it is possible to use water Fitosporina solution (15 ml in 10 l of water). Well also Ekstrasol, "Barrier", Gliokladin, insecticides "Spark", Aktara, Inta-Vir and others struggle with soil wreckers.
Defeat by fungus
Light green leaves at grapes, together with pale and yellow spots, obletaniye of foliage can be signs of fungal defeat of bush. Most often the plant is ill false mealy dew (mildew). In the started state the disease affects clusters, they gain brown color, blue rim around fruit stems.
It is necessary to prevent defeat of grapes fungus: not to put rod in the lowland, the boggy place, to make sure that the bush is well aired. If the first signs of mildew are noticed – to process plant special structures, for example, "Topaz". So-called Bordeaux liquid – solution of copper vitriol in lime milk has perfectly proved in fight against mold fungi. It is the simplest to buy ready concentrate and in the recommended proportion to fill in in the sprayer.
As you can see, the reasons of lighting of leaves of grapes can be more or less harmless, Regular care for rods, timely fertilizing and attention to garden surely will help you to reap good harvest of fruits.