Well it didn’t take long after transplanting a few houseplants before the fungus gnats arrived. Fungus gnats thrive in moist growing medium typically used for houseplants. I noticed a few flying around my Ficus lyrata (Fiddle-leaf fig). Once I inspected the soil, I saw the adult gnats crawling around the surface. I tried a spray of soapy water for a few weeks, but that did not help. Ultimately I purchased some yellow sticky traps from Gardens Alive.
They worked very well. I like the butterfly shape and replaced the yellow traps twice already. Within a few days, the traps are covered with gnats. Poor things…
I’ll post another update in a few weeks to see if the sticky traps alone worked. Gardens alive also sells Knock Out Gnats™ granules which is a strain of Bacillus thuringiensis BT. Larvae in the soil will ingest the water dispersed fungicide granules and die. I hope the yellow traps do the trick.
Are you having issues with Fungus gnats? If so, how are you managing them?