Chlorosis of leaves: description, photo, methods of struggle

Any gardener encounters such a concept as chlorosis of leaves. The disease of the plant is manifested in unnatural (off-season) yellowing and falling leaves. The cause of the disease lies in the violation of the formation of chlorophyll, and hence - a decrease in the activity of photosynthesis. The leaves can lose their coloring not only completely, but also partially, and new (young) shoots and leaves are noticeably smaller. The edges of leaf blades are often twisted, buds formed (on flowers) are deformed. The tips of the shoots are either very weak or shriveled.

Chlorosis of leaves can be infectious (possibly infecting other plants) and non-infectious (which occurs when agricultural practices are violated). Consider chlorosis in more detail.

For the beginning - chlorosis of leaves (photos of infected plants), where, as an example, grape bushes:

Infectious chlorosis of the vine leaves

Gardeners call it "spotted leaves" and "yellow mosaic". Refers to viral diseases of infectious degeneration. For the vine, the disease presents a very serious danger (leaf twisting, viral short-stemming, death of the plant). The bushes exposed to viral chlorosis become yellow-lemon. Leaves of leaves, unlike ordinary chlorosis, discolor. With a short knot, the size of the internodes decreases significantly, leaves shrink, the formation of stepsons considerably increases. When mosaic leaves of grapes, discolored together with veins, wrinkled and wrapped (twisted).

Control measures, prevention

The infected plant is immediately uprooted, the soil is etched with dichloroethane (cube residues). To prevent the emergence and spread of chlorosis, a careful selection of planting material (a vine, which is planned to be planted in the future, is harvested from bushes of absolutely healthy and strong). To bookmark vineyards, select areas that are free from nematodes, which are the main vectors of the virus. Sites that previously recorded cases of outbreak of virus-like diseases are recommended to be sown with grain (up to six consecutive years) by which nematodes do not feed.

Common chlorosis (non-infectious)

Somewhat different from infectious. There is also yellowing of the leaves, but veins remain green. At the same time, the overall growth of the plant is markedly inhibited, at the same time there are quite abundant growths (mainly - the lower parts of the bush). The reason for the appearance of non-infectious chlorosis lies in the disturbed metabolism of the plant, associated with excessive moisture, large amounts of lime, alkaline earth reaction, but more often with a lack of iron.

Control measures, prevention

With an overabundance of lime, ammonium sulphate (3 kg under a bush of grapes) is introduced. Vaccinations are recommended on rootstocks resistant to calcareous soil (the most recommended itself is 41-B Chasla in Berlandieri). With excess moisture, you can fight through a deep digging (more quickly evaporates excess water). If in your area the amount of precipitation is high, initially pay attention to varieties resistant to chlorosis.

Additionally it is recommended:

- autumn application of vitriol to the soil (directly under the bush, 500 grams);

- sprinkling with vitriol (0.5%) in the spring, during the growing season (instead of vitriol, iron chelate can be used , which is even better);

- introduction of complex feeding (micro-, macro-) with the content of manganese, iron, zinc.