Fungus gnats – feeding injury on sedum cuttings

Fungus gnat larvae (Bradysia spp.) feed on fungi and decaying matter, often injuring bulbs, seedlings and plants with succulent stems and roots. Note the feeding damage to roots on this incoming poinsettia plug. Larvae present in infested plants or media can lead to prolonged emergence of adult flies.

Fact sheets:

• Fungus Gnats and Shore Flies, University of Massachusetts
• Fungus Gnats are Serious Pests, University of Connecticut
• Managing Fungus Gnats and Shore Flies in the Greenhouse, University of Connecticut
• More Images of Fungus Gnats and Shore Flies, University of Connecticut