What are these little white bugs in my hydro water?
If you are growing medicinal marijuana with a hydro system, it is susceptible to things like Water Lice. If you remove a plant from its container and look at the water, you may see colonies if small white bugs that can be very active and hard to catch.
Fungus Gnats Can Cause Disease and Pest Invasion in Marijuana Plants
You need to kill this little baby fungus gnats. They will grow and suck the life out of your roots. As they grow, they eat plant debris, and often spread disease.
How Do I Kill Fungus Gnats
There are several ways to kill them. Fungus gnat solutions were described in detail in the answer to the expert question in issue #37. I’ll briefly list a few below. All of these pest killers listed below are harmless to you and your warm-bodied pets. They are all organic and are suitable for use on food crops. Many of these products are available at garden shops, indoor grow stores or over the internet.
- Beneficial Nematodes: are tiny worm-like creatures that feed on many kinds of soil insects and larvae. They fo a great job killing gnat larvae. The nematodes come as a dry powder like substance. They can be re-introduced once every four to six weeks or so. You can get them at Many nurseries and hydro shops.
- Botanigard: mentioned above in relation to grubs and caterpillars, also works on gnats. It contains a living fungus that infects and kills soft-bodied insects. The fungus is not interested in other life forms. It’s sort of like athlete’s foot gone super bad. It comes as a liquid that is added to the water.
- Gnatrol: The active ingredient, a bacterium named bacillus thurengensis israelensis, causes plague in gnats. It is harmless to other creatures. It comes as a liquid concentrate. It is very effective because the bacteria remain alive for a couple of weeks, plaguing the larvae newly emerging from the eggs.
- Pyrethrum: also mentioned above, is a pesticide made from a chrysanthemum-like flower. Pyrethrum is toxic to fish so it should never be used around water bodies. Once pyrethrum is used it remains active for just a short time before it deteriorates. A spray will eliminate the flying gnats. It comes in a spray that can be used as a bomb, a liquid concentrate or a wet-able powder. If you use the bomb, leave the room for a few hours. It’s not that the active ingredient is harmful, it’s just not good to breathe propellant fumes. The concentrate or powders can be prepared and watered into the soil to kill the larvae.