What to do if the tomato darkens the leg

Before planting seedlings in open ground, a gardener may experience the most unexpected difficulties. The black leg on tomatoes threatens the entire future crop of tomato. You need to deal with the problem as quickly as possible because every day of delay is worth a person a good seedling.

Black leg on tomato

The black leg in tomato seedlings occurs suddenly and spreads very quickly to crops planted in the neighborhood. If planting occurs in a greenhouse, the disease threatens both cabbage and cruciferous crops. How to cope with seedling disease?

Black leg: the cause of the appearance

The black leg is familiar to many experienced gardeners. Before fighting the disease of future tomatoes, it is worth identifying the root cause of the disease and eliminating it before it harms other crops. There can be only one reason for such a problem: a fungal disease that spreads quickly brings blackness to the legs of seedlings. It threatens the fungus to all crops growing in greenhouses or greenhouses.

Several neighboring seedlings perish from a fungal disease, destroying the future gardener's crop. The soil is a favorable environment for the fungus, and it is the soil that causes the ailment of tomatoes. If the roots of the seedlings are sick, the upper stems immediately thin out. Such a phenomenon as falling thin stems is a signal for the gardener that the root has hit the fungus.

Disease spread

An important condition for the spread of the disease is hindsight. The fungus is transported by soil, an inventory that is used to treat roots and diseased plants. If the disease is not timely eliminated, the entire seedlings may suffer from the disease.

For the treatment of tomato stalks and the elimination of the problem, a whole range of measures must be taken: the elimination of the affected stems, the removal of the fungus from the greenhouse and further prevention. Only a quick reaction of the farmer and an integrated approach will help to solve the problem of plant diseases with a minimum level of losses.

Methods of dealing with the problem

Methods of dealing with the black leg of tomatoes are necessary for both an experienced farmer and a beginner. An affected plant is a threat to the entire greenhouse. If you follow the conditional instructions and recommendations of experienced gardeners, you can get rid of black fungal disease in a short period.

It will be possible to overcome the disease if you take sequential actions:

  • clean the greenhouse from fungus;
  • destroy spoiled seedlings;
  • treat the stems of the remaining tomatoes and protect neighboring crops (if it is possible to cure damaged seedlings);
  • fertilize new soil;
  • protect the greenhouse from re-infection with fungi.

The disease can be destroyed only by sequential actions that are carried out in one day. You cannot lose precious time.

A disease that did not manage to completely destroy the root system of seedlings can be saved. Methods of dealing with the black leg involve the treatment of seedlings with the help of special drugs.

Greenhouse cleaning

First of all, the spread of the fungus must be stopped, and for this to deprive the disease of a favorable environment. From the black legs should be fought gradually, in several stages:

  1. In the first days, immediately after traces of the black leg were detected, watering of the seedlings ceases. You can not help the fungus, spread even faster.
  2. As soon as the soil dries, you need to do constant ventilation of the greenhouse. This should be done carefully, avoiding drafts or freezing of plants.
  3. Additionally, all condensate collected in a few days is cleaned in the greenhouse. Fungal disease spreads only in a humid environment. Temporary dryness does not threaten seedlings.
  4. The next stage is the most difficult - to stop the disease, you need to completely thin out all planted tomatoes. This must be done carefully, but very carefully. Even one black leg left unattended can harm healthy seedlings of tomatoes or other crops.
  5. The land after the tomatoes is also removed from the greenhouse so that the seedlings do not threaten anything else.

After this, a number of measures are carried out that are aimed at disinfecting the entire soil. For these purposes, use a solution of potassium permanganate. The solution washed the entire soil, and then dried it. Dry soil is mixed with clean soil, and then used for re-planting. Formalin seedlings will not harm formalin, if the gardener failed to get potassium permanganate.

Manganese solution will help disinfect the soil

Seedlings need to pour more fertilizer or increase the amount of nitrogen in the soil. To do this, immediately after planting, the tomatoes are fertilized with mineral complexes or sprinkled with wood ash. The quality of a tomato in the future directly depends on the condition of the soil after a disease.

Seedling treatment

The black leg progresses very quickly in acidic soil and kills everyone, even the most powerful seedling of tomatoes or other crops. Plant treatment consists not only in the mass destruction of diseased seedlings, but also in the treatment of damaged crops. To the disease disappeared, use colloidal sulfur, in a concentration of not more than 5%. Treatment with potassium permanganate also shows good results. An inexpensive drug that prevents and destroys the disease, is used before planting seeds and in cases where seedlings are transplanted urgently.

To combat the disease (manifested by yellowness of stems) use:

  • "Fitosporin";
  • Bactofit;
  • "Fitalovin" (dosage of 300 mg).

As soon as the disease manifests itself, most of the seedlings can be saved. The first to suffer are small seedlings. If the stems are bent, the plant is thrown away, but with yellow spots you can still fight. At the first manifestations of the fungus, seedlings are sprayed with Fitosporin. “Fitoferm” helps to fix another disease, which is similar in appearance to fungal diseases (roots and stems also darken from pests). If "Fitoferm" did not help, you should fight against a fungal disease.

If the disease progresses rapidly, it will not be possible to save all the seedlings. The drug for disinfection is suitable only for weakened, but untouched ailment stems. For tomatoes that have already been affected, no drug will be a salvation. The disease stops only by depositing diseased stems (it is necessary to fight with the fungus resolutely).

Folk ways of struggle

The black leg of seedlings is treated if a problem arises in a timely manner. If the gardener is afraid to use chemistry, he can try one of the effective folk recipes:

  1. First of all, as in the treatment with "chemistry", so that the black leg of the tomato does not spread further, a person reduces watering. To prevent the tomato from drying out, it is watered with a spray bottle.
  2. To combat the fungus, the entire soil around the plants is covered with wood ash.
  3. To combat the fungus, use a concentrated decoction of onion peels. Such measures will help to destroy the fungus in a weak tomato with a clean leg.

To combat the fungus in a tomato, special fertilizers containing nitrogen are used. In this matter, it is important not to overdo it, otherwise you can achieve the opposite results. All measures taken are combined with continuous thinning of rows. Each leg should be sedimented from neighboring crops and, in case of illness, easily removed.

In no case should you use manure to fertilize plants. Manure can contain a lot of spores of the fungus, which fall into a favorable environment (moist soil) and begin to multiply immediately.

Disease prevention

Timely preventive measures eliminate the need to remove the seedling affected by the fungus. If the gardener cares about the culture, so that each leg of the tomato is protected, you will not have to fear the darkened rhizome.

Prevention measures are carried out before planting seedlings. Sits a leg or tomato seeds in the prepared soil. For these purposes, colloidal sulfur is used, which seeds are processed. The soil is thoroughly frozen and ventilated before planting. Seedlings should not be planted in the old soil after last year's crops. Airing and watering is organized in the greenhouse on schedule. Consistency in such a business will only benefit the gardener. So that the leg of tomatoes does not darken, the soil is periodically fertilized.


The black leg is a problem that can affect any gardener. Neither professionals nor beginners are safe from fungal disease. The person’s reaction rate determines what kind of crop he will be able to harvest soon.

The faster the fungus is stopped, the more seedlings can be saved. Restoring part of the seedlings is easier than losing the entire greenhouse due to a fungal disease. For the treatment of tomatoes you will not need expensive drugs or excessive costs.


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