Last year, neighbors in the country gave tomatoes in a greenhouse Cladosporium devoured. Most offensively, tomato bushes had already formed a fetus by the time the disease appeared. So counting on the second wave of the crop was useless.
As a result, the neighbors had to tear up the plants with the root and plant mustard in the greenhouse in the hope that it would help clear the soil of the infection.
What do the first signs of tomato cladosporiosis look like?
Usually, the infection first affects the front of the leaves, which are located in the lower tier of the plants. They are covered with yellowish shapeless specks, while on the underside of the leaf a sticky light olive coating forms.
Gradually, the spots acquire a brownish tint and spread to the entire surface of the lower leaves, the reverse side of which is darkening. After this, cladosporiosis quickly spreads to the tops of tomato bushes.
The development of the disease is helped by moderately warm – +22 … 25 degrees – and increased humidity in the greenhouse. The causative agents of infection winter on plant tops, in the cracks of the greenhouse structure and in the soil.
The main rule of treatment for tomato cladosporiosis is timely prevention. It consists of maintaining a suitable hydrothermal regime in the greenhouse:
- Avoid sudden changes in room temperature;
- regularly air greenhouse beds;
- water tomatoes according to the rule “plentifully, but rarely”;
- cover the soil between plants with a dense layer of mulch;
- watering and mulching operations are carried out in the first part of the day – pathogens condoms awaken only at night, with excessively damp air.
Tear off the first affected leaves and carefully place in a container with a solution of potassium permanganate or vitriol, and then remove from the greenhouse.
Treat bushes from a fine spray with preparations of copper oxychloride – 35-40 grams per 10 liters of water or Abiga-peak – 45-50 grams per 10 liters of water. Repeat spraying after a week and a half, but no later than three weeks before the expected harvest.
Many summer residents believe in the effectiveness of the Bordeaux mixture against cladosporiosis. But my experience has shown that there is little truth in this statement.
Treatments with copper sulfate and manganese sulfate in microdoses – from 3 to 5 grams per 10 liters of water – increase the resistance of tomato bushes to various diseases. But this is only a preventative remedy.
The most reliable way to prevent the occurrence of Cladosporium in a greenhouse with tomatoes is to plant varieties and hybrids that are resistant to the disease. In this regard, tomatoes such as Swallow, Player, Lavanya, Verlioka, Gamayun, Typhoon, Stresa, Swift, Grenada, Baby, Associate Professor, Leopold, Hurricane, Castalia have proven themselves well.
I recommend a look at the tomato hybrids F1 Biathlon, Botticelli, Viardot, Princess, Lezhebok, Nolik, Russian size, Frant, Bittog, Vereya, Harmony, Idol, Nasha Masha, Moscow Region, Talisa. These tomatoes are also rarely affected by TMV and fusariosis.
This season, the neighbors decided not to grow tomatoes in the greenhouse and temporarily take it under cucumbers. In the fall, they plan to replace the top layer of greenhouse soil and re-sow green manure. Most likely, such an integrated approach will allow driving the infection out of the greenhouse.