Food Grade Diatomaceous Earth
Diatomaceous earth consists of fossilized remains of diatoms,
a type of hard-shelled algae.
Home: Food Grade Diatomaceous Earth as an Organic Pesticide
Pets: Food Grade DE for Flea, Tick, and Lice Control
Plants: Food Grade DE as a Natural Insecticide
Livestock: Eliminate Worms and Parasites with Food Grade DE
Tip: Using Diatomaceaous Earth in the Garden
I purchased 2 lbs of Diatomaceous Earth (food grade) recently from Mary's to help organically kill off an infestation of Fungus Gnats. Day 1 I was killing (by hand) as many as 50 nymphs per day as they would surface in my pots. By day 2 of applying the DE I was down to only 3. Today is day 3 and I haven't seen a Gnat Nymph yet. Very satisfied with this purchase. I was honestly very skeptical this would work, but so far so good. One thing I highly recommend if you have Fungus Gnats is to also spread the DE in the catch tray and cover the holes where the water comes out as this is where they like to hide and reproduce (where you can't see them).