Gnatrol is a microbial insecticide that attacks the maggots of fungus gnats, shore flies, and other flies in the soil. The active ingredient Bacillus thuringiensis israelensis (Bti) bacteria doesn’t kill the flying adults; the maggots must eat it. Hydroponic growers like Gnatrol’s cost-effective control of fungus gnats. Gnatrol WDG (water dispersible granules) is OMRI listed for organic, and pending CA EPA approval. The liquid comes in 2.5 gallon jugs and the graunles in 16 lb pails.
For more info, check out our Gnatrol bulletin.
This product article originally appeared in our Biocontrol Beat Winter 2008.
The Bug Farm 
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