Black spots on even green tomatoes – one of widespread problems of gardeners. The struck fruits are not suitable for consumption at all. This misfortune has many reasons for emergence.
Normal decay, the shortage or surplus of fertilizer, excess humidity and also wreckers of plant can provoke blackening of tomatoes. At due leaving and timely treatment, it is possible to save tomatoes from this misfortune.
For a start it is necessary to define the reason of emergence of black spots. If the blackness extends on all tomato, and pulp under it always firm and is deprived of juice, the plant means the dry topmost rot has struck. It appears at excessive salinization of soil that happens at introduction of large amount of fertilizers. Exit is simple: it is necessary to stop fertilizing for a while. Besides, decay can appear at the shortage of calcium. In this case it is possible to spray tomatoes with solution of calcic saltpeter.
Tomatoes can blacken also because of very dry soil and so-called "vylezaniye" of roots on surface. Tomatoes in this case will absorb strongly moisture from air that usually occurs unevenly. From here fruits become covered by dark stains. Also the shortage of such microelements as magnesium and pine forest can be the cause of emergence of blackness on tomatoes. In this situation it is possible to make fertilizing of plants solution of sulfate of magnesium and boric acid. Most often tomatoes become covered by black spots because of disease under the name phytophthora. It affects not only fruits, but also stalks, tomato leaves. Big air humidity, sharp temperature fluctuations, cold dews, frequent morning fogs and small distance between bushes contributes to the development of phytophthora. Similar weather patterns usually happens in August, just during maturing of tomatoes. If in your area the humidity is always high, follows in the preventive purposes to spray tomatoes with the Bordeaux liquid. In addition, tomatoes can blacken because of industrial emissions. From it any gardener whose site is near some plant is not insured. In independence of the reasons of emergence of black spots, always delete the struck fruits. It is the best of all to burn the struck green parts of plant.