GNATURAL specifically controls the larva of fungus gnats or commonly known as Scarid Fly and helps break the reproductive cycle to get rid of them! It is not effective against the Adult fungus Gnat. The gnats (which live for 7 days) lay their eggs in healthy soils and it takes the eggs approximately 4 days to reach the larval stage. It is the larva that causes damage via feeding on plant roots causing wilting and death. The larva eat the GNATURAL becoming infected with the bacteria and die! It may take 3 weekly applications to effectively control oncoming generations of gnats.