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Fumaggini are defined as the dark spots that often are created on the foliage following the fall of honeydew produced by aphids. These spots are caused by the proliferation of microscopic fungi, which feed on the sugar contained in the honeydew; the fumaggini are certainly harmful from an aesthetic point of view, as they smear leaves and fruits; if they proliferate excessively they are also harmful to the whole plant, because they inhibit the photosynthesis of the leaves covered by fungi. Over time, the smoky spots can expand a lot, weakening the plant.

Surely the prevention against aphids solves this problem at the root; once the aphids have spread on the plant, the fumaggini tend to develop with great probability.

Fumaggini: Fumaggini

Traditionally, the fight against this type of fungi is carried out with the use of products based on sulfur or copper, which inhibit the development of fungi; in general, the fumaggini tend to stop developing after a couple of sulfur-based treatments, to be carried out away from the blooms, to avoid disturbing bees and other beneficial insects.

If the problem occurs on a houseplant, or in any case in small areas, it is also possible to remove the fumaggine mechanically, with the aid of a damp microfibre cloth; however, we must be careful to completely remove the fungus, which otherwise will tend to develop rapidly.

Surely a constant control of the presence of aphids on the plants also solves the problem of smokiness at the root; in case of infestation by aphids, the removal of the honeydew that percolates from the foliage prevents the development of fungi.

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