This product is NOT effective against Fungus Gnats. Used it weekly for five weeks. Successive generations of gnats continue to emerge.
The bottle labeling mentions various pests, but omits fungus gnats, so the above should be no surprise.
It appears to have the incorrect subspecies of Bacillus thuringiensis. The israelensis ssp. is the one which targets the fungus gnat, not the kurstaki ssp. found in this products. Since liquid Gnatrol is no longer available, the only thing that worked for me was adding about an inch of sand above the soil to prevent both the female fungus gnat from laying her eggs and the adults emerging.
I hope this helps.Get more detail about Bonide Bt Thuricide 8-Ounce Worm Killer and Gnat Control.
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