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Pathogen disease is mushroom Botrytis (Botrytis cinerea Pers)related to the so-called wound parasites. The infection mainly spreads through the air, contact, when caring for plants and during harvesting. Conidial plaque “spraying”, spores can spread with water spray. Many small black sclerotia can form on plant debris, which in turn can be sources of infection.
The disease is quite common, and can affect many cultures. From a detachment of vegetables, tomatoes, lettuce, beets, potatoes, beans, cabbage, onions, as well as cucumbers and radishes, are affected. In rainy years and cool summer days, it can almost completely destroy all strawberries. It is very important that botritis is used to produce Tokai wine - namely, infection with a dried fungus of bunches of grapes like this gives the signature taste to the true flow.
Biological preparations against gray rot
Pretty gray rot can appear brownish, rapidly increasing areas on the shoots and leaves. If, at high humidity, brown necrosis is covered with gray fluffy spores and mycelium, which are spread by drafts and infect neighboring plant leaves. And since the botrytis fungus is omnivorous, a similar gray rot from some plants can spread to other representatives of the flora.
Favorable conditions for the defeat of plants by gray rot arise if low temperature and high humidity at the same time. Based on this, plants can not be placed next to one, it is necessary to ventilate the premises more often when you are watering, but moisture must be avoided on the leaves. Of course, it is advisable to avoid getting fertilizer on the leaves in which the nitrogen concentration is higher. A very large amount of nitrogen can cause the cell walls to soften, and similar tissues become susceptible to infections.
More careful handling of the representatives of the handicap of its formation, especially when removing shoots and leaves, reduces the surface of wounds and, thereby, reduces the possibility of rot. Remove damaged areas of leaves and stems with a sharp knife in dry sunny weather. All plant residues are removed without fail, as they can become sources of plant infection.
Protection of strawberries and strawberries from gray rot
In case of small infection, you can spray with Bordeaux liquid or with Topaz, Champion, Oksikhom, Kuproskat. To combat the rot of such a plan, you can also use the drug Integral. You can use and apply such tools as Kartotsid or Skor.
When foci are detected on plants of gray rot, some practice plastering the affected areas of leaves and stems with paste from glue based on CMC and trichodermin. Very affected areas must first be cut.
You can also use a coating with fungicide.
For such a coating, the following composition is used: for 10 l of cold water, 300-330 g of CMC glue and 20-50 g of fungicide are added. Such a mixture must be brought to a pasty state and add chalk.