fungus gnats on Pink Princess
Quick answer
If your Pink Princess has fungus gnats, the most likely cause is: Fungus gnats are small dark flies that hover around houseplants and breed in the top layer of consistently damp potting mix; the adult flies themselves cause little direct harm, but their larvae live in the soil and feed on fungi and decaying organic matter, and can chew fine root hairs on a stressed pink princess, leaving the variegated plant weaker and more vulnerable to root pathogens. Pink princess philodendrons potted in dense, moisture-retentive substrates, double-potted in cache pots that trap drainage water, or kept in low-airflow corners are the most common sites for chronic fungus gnat infestations.
Start here:
- 1. Let the top layer of the potting mix dry out completely between waterings so the larvae lose their moist breeding habitat.
- 2. Apply a topical soil drench of diluted hydrogen peroxide to kill larvae on contact without harming the philodendron roots.
Why Pink Princess gets fungus gnats
Philodendron erubescens 'Pink Princess'
Fungus gnats are small dark flies that hover around houseplants and breed in the top layer of consistently damp potting mix; the adult flies themselves cause little direct harm, but their larvae live in the soil and feed on fungi and decaying organic matter, and can chew fine root hairs on a stressed pink princess, leaving the variegated plant weaker and more vulnerable to root pathogens. Pink princess philodendrons potted in dense, moisture-retentive substrates, double-potted in cache pots that trap drainage water, or kept in low-airflow corners are the most common sites for chronic fungus gnat infestations.
How to reverse fungus gnats on Pink Princess
- 1
Let the top layer of the potting mix dry out completely between waterings so the larvae lose their moist breeding habitat.
- 2
Apply a topical soil drench of diluted hydrogen peroxide to kill larvae on contact without harming the philodendron roots.
- 3
Replace the top few centimeters of potting mix with fresh, sterile, chunky aroid substrate and remove any decaying leaves from the soil surface.
- 4
Set yellow sticky traps near the foliage to catch the adult flies and break the breeding cycle.
Keep fungus gnats off this Pink Princess
Use a chunky, well-aerated aroid mix that drains quickly so the surface does not stay wet; bottom-water rather than top-water so the upper layer of medium stays drier; empty cache pots after each watering so roots never sit in standing water; avoid letting leaf litter accumulate on the soil; quarantine new plants and replace the top of their soil before adding them to the collection.