2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Rhizoctonia of cabbage is a fungal disease that affects the root necks of plants - the yellowed tissue of the root necks dry out and die off quickly, and the seedlings often die completely. Infected cabbage leaves are easily separated from the cabbage stumps, which in turn contributes to an overall decrease in the mass of cabbage cabbage. And sometimes the heads of cabbage can even completely rot away from the stumps. This ailment is especially unpleasant in that it can easily continue to develop even at the stage of storage of the cabbage crop
A few words about the disease
The roots of crops affected by rhizoctoniae are milled, and round small yellowish-orange spots begin to form on their cotyledon leaves. Infected tissues dry up and slowly die off, thereby contributing to the death of the entire plant.
Cabbage seedlings are most often affected by rhizoctonia, when they are already planted in the beds and lumps of earth begin to fall on its delicate leaves, on which the causative agent of the harmful disease has lurked. Infected leaf petioles are characterized by the formation of ulcers, the size of which reaches about 2.5 cm, and rather large brownish spots with an irregular shape begin to appear on the leaves themselves.
As a rule, cabbage leaves affected by Rhizoctoniae fall off, thereby reducing the weight of the heads of cabbage.
The causative agent of this misfortune is Rhizoctonia solani - an imperfect mushroom that is completely undemanding to environmental conditions. This fungus is capable of developing when the acidity of the substrate is in the range from 4, 5 to 8, the moisture capacity of the soil is from 40% to 100%, as well as with significant temperature fluctuations (from three to twenty-five degrees). The harmful fungus is also characterized by the absence of a dormant period.
The fungus pathogen is spread by pieces of mycelium, since spores usually do not form during its growth. As it grows, it releases toxins that kill vulnerable epithelial root cells. In the soil, the preservation of the fungus most often occurs in the form of sclerotia. It is also often preserved on plant remains. It is noteworthy that in the absence of host plants, Rhizoctonia solani can persist in the soil for five to six years without losing its destructive properties all this time.
How to fight
In addition to observing the basic agrotechnical rules (growing seedlings in healthy soil, observing crop rotation, culling infected seedlings, etc.), you should also take care of the appropriate pre-sowing preparation of seeds - soaking them before sowing in solutions of high-quality bacterial preparations is an excellent preventive measure. After such treatment, a kind of "protective cover" is formed around the roots germinating in the substrate, which consists of a huge number of various beneficial microorganisms. Seed dressing with Phytolavin also gives good results.
By the way, "Fitolavin" is also recommended to spray the growing seedlings when it releases about two or three leaves. And before planting the seedlings in the ground, its roots are often dipped in the so-called "talker", which is prepared from a mixture of "Fitolavin", clay and mullein with water.
In order to control cereal and annual dicotyledonous weeds, it is recommended to thoroughly spray the soil before planting seedlings or until tiny shoots appear.
From chemicals, it is allowed to take any drug containing copper oxychloride or mancoceb. As a rule, a 0.2% working solution is prepared from them.
Among the most effective bacterial preparations in the fight against cabbage rhizoctoniae are Planriz, Baktofit and Pseudobacterin, and among the mushroom preparations, Glyocladin and Trichodermin are the best. It is recommended to spray plants with "Baktofit" also in case of damage to fruits and leaves touching the ground by the pathogen.
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