Gnatrol WDG Biological Insecticide provides fungus gnat control. OMRI-listed. Ease of use - easier to measure and mix WDG formulation. Extended shelf life - dry formulation means more stable shelf life. Active Ingredient: Bacillus thuringiensis, subsp. israelensis, strain AM 65-52 fermentation solids, spores and insecticidal toxins - 37.4%.