Under the influence of root pressure water formed due to high humidity or excessively watered soil rises up the plant. This is how edema develops - the edematous state of the leaves and the stem arising from the glut of the leaf plate with moisture.
Symptoms of the disease
Growing on the leaves of tomatoes, resembling white mold - an alarming symptom that may indicate the presence of such a disease as oedoma. Disease oedoma popularly called "dropsy." This is due to the fact that it manifests itself in the form of small swollen tubercles on the leaves and petioles of tomatoes. Such lesions appear watery, although they are quite dense to the touch.
The defeat of the petioles of tomatoes often resembles white mold. Spots on the stem of the plant may appear dotted or completely cover the stem, which causes it to twist. Despite the defeat, the color of the plant remains unchanged.
Causes of oeda
A fungus, infection, or bacteria is not at all the cause of plant damage. There is oedema due to the lack of lighting and heat, which is necessary for tomatoes, as well as because of the highly moist soil.
Roots of tomatoes in such conditions are prone to death, which leads to malnutrition of the ground part. Those parts of the plant, which received nutrients from dead roots, and are covered with tubercles.
Often those plants that are located under the illumination and stand very close to each other suffer from a lesion.
The emergence of the oedema can be facilitated both by too abundant watering of the plant, as well as air temperature and its humidity. For example, they planted a plant on a sunny day and naturally watered it well, but after a while it began to rain heavily. The ground is cooled and the sun is needed, which is not there, and this is how oedya develops.
How to protect tomatoes from damage: treatment and prevention
Oedema is characterized by the fact that the areas of the plant that are affected are not restored and fall down after a while. It is not necessary to treat this disease, as it is not contagious and does not affect the yield. However, there are methods that will keep the plants in a good, healthy way.
As it turned out, there are no special ways to deal with oedema. To prevent this damage, it is necessary to adjust the volume of irrigation and its regularity. It is necessary to organize suitable conditions for tomatoes: give more light, loosen the soil after watering and give the plants enough space by planting them.
Circulation of dry air between the rows of seedlings will not allow disease to form. It is necessary to normalize the level of humidity. Ventilation should be done with care. A land with good drainage will be an excellent prevention oedema.
What sort of tomato to choose
Tomatoes love heat, which is why many gardeners prefer to grow them in greenhouses. However, greenhouse growing conditions for tomatoes differ in a number of characteristic features: increased air humidity, the absence of a large amount of light, as well as frequent changes in temperature conditions.
Greenhouse conditions are not suitable for all types of tomatoes.Improperly selected variety can not bring fruit, but only a disorder for gardeners.
Tomatoes adapted to extreme greenhouse conditions:
- "Union 3";
- "Union 8";
Properly selected varieties of tomatoes, as well as competent care will allow you to get a good harvest.