fungus gnats on Rubber Plant
Quick answer
If your Rubber Plant has fungus gnats, the most likely cause is: Adult fungus gnats (Sciaridae family) lay eggs in the consistently moist top layer of potting mix used for Ficus elastica; larvae hatch and feed on root hairs, soil fungi, and decaying organic matter, weakening young or stressed root systems while adult gnats swarm the soil surface as a telltale sign of overwatering.
Start here:
- 1. Allow the top inch of soil to dry out completely between waterings to break the larval life cycle and discourage egg-laying in damp substrate
- 2. Apply Bacillus thuringiensis israelensis (Bti) granules to the soil surface to kill larvae while they feed on the treated substrate
Why Rubber Plant gets fungus gnats
Ficus elastica
Adult fungus gnats (Sciaridae family) lay eggs in the consistently moist top layer of potting mix used for Ficus elastica; larvae hatch and feed on root hairs, soil fungi, and decaying organic matter, weakening young or stressed root systems while adult gnats swarm the soil surface as a telltale sign of overwatering.
How to reverse fungus gnats on Rubber Plant
- 1
Allow the top inch of soil to dry out completely between waterings to break the larval life cycle and discourage egg-laying in damp substrate
- 2
Apply Bacillus thuringiensis israelensis (Bti) granules to the soil surface to kill larvae while they feed on the treated substrate
- 3
Place yellow sticky traps near the soil line to capture adults and monitor population decline as a diagnostic
- 4
Top-dress the soil with a thin layer of coarse sand or diatomaceous earth to prevent adults from reaching the moist substrate to lay eggs
Keep fungus gnats off this Rubber Plant
Water only when the top inch of soil feels dry to the touch; use pots with drainage holes and a well-draining aroid mix containing perlite and orchid bark; avoid letting pots sit in standing water; quarantine new plants before adding them to the collection; avoid overwatering since soggy soil promotes fungus gnat breeding