Brown raid on the leaves of begonia

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Brown raid on the leaves of begonia
Last year, the young leaves of tube begonia from the bottom side were covered with a brown bloom, became solid, the tops dried up. Balsaminov Waller new leaflets curled the boat, became hard. Fudge Begonias I. balzamines could not be saved. In the summer he sprayed all the flowers with the drug "Hom" with an interval in two weeks. Now I treat the act with an interval of seven days, watering the soil. But there are no improvements. Leaf, not yet blossoming, turn into a black pea. Elastira's begonia remained, is there a chance to save them?
It is difficult to put an accurate diagnosis. The symptoms described in Balsamine are characteristic of septoriosa. Begonias are probably amazed by gray rot (Botritis) or one of the spots (philostose, anthracnose, septoriasis). What does not cause doubt is the fungic nature of infection.
Most of these diseases are combined with similar causes and general principles of prevention and treatment. In addition, very often we observe the final stage of the disease - the spioning, when treatment is ineffective. And the growth process of gif fungus in the fabric of the affected plant took place earlier and was invisible to the naked eye.
Most of all are susceptible to infections weakened plants grown from poor-quality planting material and with impaired agrotechnics. And the factors of the external environment, such as high humidity, draft, sharp fluctuations in temperature, crowded plants, the use of an infected soil substrate only contribute to the active development of the disease. A good helper in protecting and preventing mushroom diseases is phytosporin. But precisely as a preventive, and not therapeutic agent.
Treatment should be started with the creation of optimal cultivation conditions. Reduce air humidity, normalize watering, ensure sufficient air exchange, eliminate moisture from entering the leaves and stems. Fungicides are used as chemical means of combating fungal diseases: rake, soon, Ridomil Gold, etc., as well as copper-containing drugs: Bordeaux mixture, copper sipop, Xom.
There is always a chance to achieve success. Therefore, do not hurry to throw out your favorites, but do not forget about the possibility of spreading a disease on healthy plants.
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