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Adult fungus flies are small black flies that measure approximately 3 to 4 mm. They are visible when they fly away in swarms when watering, but are not harmful to plants.
Direct damage is mainly caused by the very active white larvae, 4 to 6 mm long. They feed on roots, can dig into stems and burrow into cuttings. Young plants wilt and die. Sciarids can be vectors of certain diseases.
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You will find a yellow sticky trap to detect an infestation in time, a roll of sticky band trap to ensure physical monitoring and mass trapping in greenhouses, as well as beneficial nematodes against sciarids.
Yellow Sticky Trap Yellow Sticky Band Trap Beneficial nematodes
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References
Cloyd N.A. 2016. Greenhouse Pest Management. CRC Press (Taylor & Francis Group), Boca Raton, Florida, 196 p.
Helyer N., Cattlin, N.D., Brown, K.C. 2014. Biological Control in Plant Protection: A Color Handbook. 2nd Edition. CRC Press (Taylor & Francis Group), Boca Raton, Florida, 262 p. https://doi.org/10.1201/b16042