A 100% natural organic pest control product, Fungus gnat off helps to effectively prevent and kill Fungus Gnats (Black fly). Fungus gnats lay their larvae in the root zone of your plants. The larvae eat the roots and carry infection. This spreads disease and makes it difficult for your plants to absorb nutrients - resulting in poor health or death! Fungus gnat off contains a bacterium, Bacillus thuringienis, which produces toxins that prevent the larvae from feeding. This kills the Fungus gnatts, eradicating the problem.