Why yellow leaves from a tomato

Желтеют листья у помидоровSometimes, during the maturation of tomatoes, yellowing and drying of plant leaves can be observed. At first glance, it is not clear why this is happening, because the plants were provided with sufficient watering, and bird droppings were brought in optimum quantities. To deal with this, you need to find out why yellow leaves are tomato.

If the lower old leaves begin to turn yellow before the others, and the color changes completely the entire plate of the leaf, and not the veins, then in botany this phenomenon is treated as follows: the reason is connected with the deficiency of nutrients, primarily nitrogen.

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In the event that yellowing is observed only in the leaves at the bottom, and with the new like is not observed, then there is no need to worry too much about this.

Perhaps the seedlings were able to grow fatty and sound, which was a little outgrown, and during the transplantation from the pot to the greenhouse the root system of plants represented a dense tangle. In most cases, it is just such a seedling and it takes more time to adapt to the new conditions. Therefore, it is not surprising that the leaves of the tomato bushes can begin to turn yellow, starting from the bottom and ending with the uppermost ones. This is due to the fact that there are already developing diseases and the death of overgrown roots occurs.

A similar phenomenon can also be caused by fusarium wilt. This is a dangerous fungal disease, which often affects tomatoes. This is expressed in the loss of the leaf turgor, their fading, looking at them, it seems that the plants were watered many weeks ago. This disease is included in the number of soil fungi, which can not perish for a long time in the soil, because of them the yield of tomatoes can be significantly reduced. The source of the spread of the disease is contaminated seeds, plant remains, as well as the tools that processed the soil. The fungi can also be spread by the wind. A favorable factor is also the high temperature at which the disease can affect a larger number of plants.

Every plant has the risk of being affected by this disease, regardless of age: and at the time when they are seedlings, and during growing in a greenhouse or a greenhouse, or when cultivating in the open ground. The disease affects the plant through the root system, after which it passes to the stem, whence, growing, the mycelium disturbs the functioning of the vascular system of the plant. When the disease develops, the plant weakens, and there are cases when water and nutrients stop flowing. There is a serious delay in growth, which is accompanied by yellowing of tomato leaves.

After transplanting to a permanent place in the seedling, yellowing and dying off of the lower leaves are first observed, after which the disease begins to spread to the upper parts, which ends with the complete death of the plant. If the plants have a small scale of damage, then at the end of the summer they may become tied up with a small number of small fruits that reach the stage of maturity before the term.

What to do if yellow tomato leaves

To cope with the disease, it takes a lot of time and effort. A mandatory condition here is strict adherence to preventive measures. You need to start with seeds, which should be replaced with new ones. If you grow tomatoes from your own seeds, then the seeds must be prepared for sowing: disinfection should be done for 20 minutes in an 1% solution of potassium permanganate (1g per 100 ml of water) and then rinsed several times using fresh water.

Помимо этого уделить внимание следует и рассадным ящикам, которые должны быть продезинфицированы. Для приготовления почвенной смеси используют землю, взятую в местах, где нет признаков болезни: на лугах, опушке леса, для парника готовят новую почвосмесь. Растительные остатки пораженных кустов должны быть хорошо собраны и уничтожены за пределами сада на костре. Не следует использовать ботву таких растений для приготовления компоста и иных удобрений. Тщательной дезинфекции следует подвергнуть и садовый инвентарь, с использованием которого проводились работы на участке. Грядку для помидор готовят на новом месте, которое должно быть не заражено болезнью.

More heavily loamy soil is susceptible to a large-scale spread of the disease. In this regard, when planning to grow tomatoes in such places, it is necessary to dig through the soil with the introduction of coarse sand. Increased resistance to infection with this disease, tomatoes demonstrate, if they are provided with a sufficient amount of phosphorus and potassium fertilizers, and also sprayed with a solution of potassium permanganate (1 tbsp per bucket of water).

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