Any gardener faced with a term such as leaf chlorosis.The disease manifests itself in unnatural plants (-season) yellowing and leaf fall.The cause of the disease lies in the violation of chlorophyll, so - reducing the activity of photosynthesis.Leaves thus may lose color not only fully but partially, and new (young) shoots and leaves are shrinking considerably.The edges of the leaf blade is often twisted, formed buds (the flowers) are deformed.The tops of the shoots are either very weak or shrunken.
leaf chlorosis may be infectious (possible contamination of other plants) and non-communicable (from violations of farming).Consider chlorosis detail.
to start - leaf chlorosis (Photo infected plants), where, as an example - vines:
Infectious chlorosis vine leaves
Gardeners call it "leaf spot" and "yellow mosaic."Treat a viral infectious disease of degeneration.For the vine disease is a very serious danger (leaf roll virus korotkouzlie, the death of the plant).Bushes have been exposed to the virus chlorosis, are lemon yellow.Vein, unlike conventional chlorosis, discolored.When korotkouzlie significantly reduced the size of the internodes, the leaves become smaller, the formation of laterals greatly increased.When the mosaic leaves of grapes, discolor with veins, shrink wrapped and (twisted).
Control measures, prevention
infected plants immediately uprooted, the soil is etched dichloroethane (residues).Prevent the emergence and spread of chlorosis can careful selection of planting material (vine, which is planned to be planted in the future, is harvested from bushes completely healthy and strong).To select a bookmark of vineyards areas free of nematodes, which are the main carriers of the virus.Parts where previously recorded cases of outbreaks of virus diseases, it is recommended to sow grain (up to six years in a row) that nematodes do not eat.
usual chlorosis (non-infectious)
differ somewhat from infection.Here too there is yellowing of leaves, but the veins remain green.The total plant growth significantly inhibited at the same time there is quite abundant seedlings (mostly - the lower part of the bush).The cause of non-infectious chlorosis is disturbed metabolism in plants associated with excess moisture, plenty of lime, alkaline soil, but most often - a lack of iron.
Control measures, prevention
When an excess of lime making ammonium sulfate (3 kg of grapes under a bush).Recommended vaccinations on rootstocks resistant to lime the soil (the most established itself 41-B on Berlandieri Chasselas).With an excess of moisture can be controlled by deep digging (excess water evaporates quickly).If your area of increased rainfall, originally look for varieties that are resistant to chlorosis.
Additionally recommended:
- making autumn sulfate to the soil (directly under a bush, 500 grams);
- spraying sulphate (0.5%) in the spring, during the growing season (instead of vitriol can be used iron chelate, which is even better);
- making complex dressings (micro, macro) containing manganese, iron, zinc.
