Blackening tomatoes can trigger the usual rot, lack or excess fertilizer, excess moisture, and pests of plants. With proper care and timely treatment can save the tomatoes from this scourge.
The first step is to determine the cause of the black spots. If the black is spreading around the tomato, and the flesh underneath it's always solid and devoid of juice, then the dry plant was struck by apical rot. She appears in the excessive salinization of the soil, what happens when you make large amounts of fertilizer. The solution is simple: you need to stop feeding. In addition, the rot may appear when the lack of calcium. In this case, you can spray the tomatoes with a solution of calcium nitrate.
Tomatoes can turn black and because of the very dry soil and the so-called "vylezanija" roots to the surface. Tomatoes in this case will be hard to absorb moisture from the air that usually occurs unevenly. Hence the fruits to bruise.
The cause of the black on tomatoes may be a shortage of minerals, such as magnesium and boron. In this situation, you can make fertilizing plants with a solution of magnesium sulfate and boric acid.
Most often the tomatoes are covered with black spots due to a disease called late blight. It affects not only the fruits but also the stems and leaves of tomato. Development of Phytophthora contributes to the greater humidity, rapid temperature fluctuations, cold dew and frequent morning fogs and a little distance among the bushes. Such weather conditions are usually in August, just at the ripening period of tomatoes. If in your area the humidity is always high, should be preventively sprayed the tomatoes with Bordeaux liquid.
In addition, tomatoes can turn black due to industrial emissions. This is not insured by any gardener, the site of which is near any plant. Regardless of the reasons for the emergence of black spots, always remove affected fruits. Amazed by the green parts of plants are best to burn.