Microorganism Selection Table
Anyone who buys cabbage seedlings on the side, at some point, introduces a common and more harmful disease of cabbage crops to his garden of keel.
WHY A KILA IS DANGEROUS To the risk group The keel is transmitted mainly through the soil. The causative agent of the disease is the fungus Plasmodiophora brassicae. It affects all varieties of cabbage, other cabbage crops (radish, radish, daikon, turnip, swede, watercress, mustard), as well as weeds of the same family (colza, feral radish, field mustard, shepherd’s bag, yarok, etc.). Especially sensitive to keel are cauliflower and early white cabbage, as well as many high-yielding modifications of Dutch breeding, regardless of the maturity. Infection with keel occurs throughout the growing season. The earlier it came out and the more massive it is, the greater the damage will be done to the crop. In the case of a languid lesion in cauliflower, the heads may not form at all, and in white cabbage very small loose forks are formed. Given that cabbage crops account for almost a third of all vegetables grown in family gardens, you can imagine what a disaster is a keel, at one point brought to the site.
Symptoms of damage On the roots of the affected plants, thickenings (swelling, growths) of snow-white color of various shapes and sizes are formed. If the plants were infected at the seedling stage, then large swellings form on the main roots. If healthy seedlings were planted on infected soil, then the keel looks different on the lateral roots, small thickenings form in the form of icicles and beads. To the ozary, the growths turn brown, rot and collapse. With all this, an unlimited number of spores (cysts) fall into the soil, which retain their viability for 67 years. At least some plant from the cabbage family, which will be on infected soil, will provoke spore germination with its root secretions. The resulting mycelium, growing towards the roots, infects the sensitive plant, penetrating the root through the root hairs.