Garden Pests and Diseases: Fungus Gnats, 2 by Zen_Man

Zen_Man wrote:
I think that the Gnatrol, Mosquito Bits, and Mosquito Dunks all contain the same bacillus as an active ingredient. I am not a fan of Diatomaceous Earth -- some grades of it are potentially harmful if you should inhale any of the dust. The peroxide probably should be diluted, although the commercial version is already diluted to 3%. The Perlite, Vermiculite, and coarse sand might be unfavorable to the maggots, but that could be expensive if you have a lot of pots. The bacillus method is probably the most cost effective solution.

I use Imidacloprid systemic insecticide to start off the season with my indoor zinnias, to prevent aphids, and thrips, as well as fungus gnats. In the absence of outdoor enemies, aphids and thrips can have population explosions indoors in indoor zinnias. And I prefer prevention rather than cure for fungus gnats.

ZM