Kila cabbage is one of the most dangerous and very common diseases caused by the inferior fungus Plasmodiophora brassicae Wor. Only live garden crops are affected, including cabbage, radish, rutabaga, mustard leaf, turnip, radish and most other cruciferous plants.
Cabbage keel was first studied and described in sufficient detail by M.S. Voronin in 1871. The fight against keel cabbage includes a whole range of various activities, and just knowing what to do, you can protect the vegetable crop from this disease.
Signs of the disease
The root system is affected by the pathogen, not only young, but also an adult, fully formed vegetable culture. Early ripe varieties of white cabbage and cauliflower are most affected by keel. Leaf lesions of cabbage are less affected. Cruciferous weeds, including a shepherd’s bag, yarut, wild radish, field mustard and colza, become a factor contributing to the rapid propagation of fungal infections.
The disease is characterized by the formation on the root system of growths and swellings, which can reach impressive sizes. Sometimes it is possible to observe the formation of growths on the stem part, as well as petioles or leaves of the garden culture. The infected root system weakens the rooting process, as a result of which the plants are easily pulled out of the ground.
It should be remembered that it is very difficult to detect the keel in young and already growing plants on ridges. To draw conclusions about the presence of the disease is possible only with the most thorough examination of the roots of seedlings. For older and fully formed plants affected by pathogenic microflora, the appearance of lethargy and yellowness of the leaves, as well as the underdevelopment of heads of cabbage are characteristic.
When infected in the early stages of development, heads of cabbage are not tied at all, and the emerging root crops stop their development. A significant defeat often causes a complete absence of formed heads. This situation is due to blocking growths of the basic functions of the root system of the plant and impaired absorption of water, as well as the main nutrients.
Cabbage Disease: Kila
The main causes of defeat
The main source of infection is soil affected by fungal spores. Such disputes perfectly retain viability for a long time, which is estimated in years. Spores that enter the soil from a decomposed infected root system can spread very quickly through water, soil insects, and earthworms. Uninfected plots of land can be affected as a result of planting diseased seedlings.
The main conditions conducive to the development of keel are:
- air temperature indicators at the level of 18-25 ° С;
- humidity indicators not more than 75-90%;
- soil pH at the level of 5.6-6.5.
The defeat of the keel was especially widespread in the Non-Black Earth Region, due to the most favorable soil conditions for such diseases, including increased humidity and acidity.
The causative agent of cabbage keel is represented by a lower fungus that can persist in soil at the cystospore stage for many years, which somewhat complicates the fight against this damaging factor.
|General events||Chemical protection technology|
|The cultivation of modern and most resistant to damage varieties. Compliance with crop rotation and the return of susceptible varieties to the previous plot no earlier than five years later. Use in greenhouses and greenhouse constructions of fresh and disinfected soil.|
Thoroughly check seedlings for damage.
Liming of acidic soils.
Timely destruction of weeds of the cabbage family
|Processing the root system of the planted plants with clay mash with the addition of sulfur-containing agents, including colloidal sulfur, Tiovit Jet or VDG preparations|
Proper implementation of preventive measures can reduce the risk of damage to the vegetable crop of keel and improves the quality of soil on the site.
|Spread prevention||Collection of affected plants, followed by their destruction in a fire. Introduction to the site of beet tops with the preparation "Radiance-1" followed by shallow digging of the soil|
|Quarantine||Do not plant radish, radish, daikon, turnip, watercress, mustard salad and any kind of cabbage on infected soil|
|Soil farming||Cultivation in the affected areas of nightshade, lily and haze for three years. Maintaining a pH of 7.2, which prevents malicious spores from germinating|
It is very important to avoid conditions such as insufficient calcium, potassium, zinc, boron and chlorine in areas designated for the cultivation of cruciferous garden crops. The standard humus content should be at least 2.5%. In addition, the soil should not be waterlogged or overdried, and also have an acidic environment. Strict adherence to agricultural technology and the acquisition of high-quality, healthy seedlings reduce the risk of keel damage to a minimum.