Fungus Gnats on Croton: Non‑Chemical Control

Adult gnats are harmless; the larvae in the top soil layer are the target. Let the soil dry as much as possible. Remove loose surface soil and add a layer of coarse coir, sand, or diatomaceous earth to shred larvae. Place ½‑inch raw potato slices on the soil overnight to trap larvae, then discard. For severe cases, use "Knock‑Out Gnats" (Bti). Prevent recurrence with sterile, bark‑free, well‑draining potting mix. Trap adults with a little red wine in a glass.