Fat plants

Brown spots

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Question: brown spots

hi I have a succulent plant that I noticed lately some dark rust-like spots have appeared, for the moment they are small but I don't want them to get bigger. what can i do to him? should i give it some care? thank you very much


Answer: brown spots

Dear Chiara,

ninth I am selling a photograph it is not easy to decide what the problem is that afflicts your cactus; in fact, if the spots are reddish, similar to rust, it could be, as you suggest, rust of the cacti, caused by a parasite called septoria; it is a fungal disease. The best way to eradicate it is to provide your plant with a systemic fungicide, i.e. a product that must be mixed with the irrigating water, so that it penetrates inside the plant, hitting the fungus from the inside and not from the outside. However, consider that brown spots generally remain and tend to dry up, but if the fungus is killed they do not spread to the rest of the plant. Another type of spotting can be caused by excessive and sudden exposure to the sun. In this case, these are rounded and dark spots, almost brown or purple. It often happens in plants stored at home that are moved outdoors in spring: the dew caused by the temperature difference between day and night is gathered in small drops on the delicate epidermis of the succulents; when the sun arrives, before the dew dries completely, the droplets act as a lens for the sun's rays, and cause characteristic burns; in this case, placing the plant in a semi-shaded place, and then placing it in the sun gradually, is a solution. Some spots, usually yellowish, are instead caused by the presence of insects, which you should however see on your cactus (at least with the aid of a lens); in this case it is necessary to treat the plant with an insecticide, systemic or by contact, with a wide spectrum of action.

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