Fungus gnats are quite commonly found at indoor cannabis gardens, and from time-to-time at outdoor gardens as well.
Fungus gnats are black in color, with long legs and wings, and between 3 to 5 millimeters in length. They hatch larvae that have black heads and a clear body. They are found down at the bottom portions of the cannabis plant, and even in the soil.
The larvae that the females lay burrow down below the soil level about 1 to 3 inches. The adult fungus gnat does not eat at all, and instead live only to breed. The little baby gnats feed on the soil and roots and can over time cause a weakening of the strength of the plant. They are very damaging to cannabis plants because they affect the drainage properties of the soil.
Fungus gnat hatchlings can often be seen drifting in the run-off from the water that is fed to cannabis plants and gathers in the tray underneath the pot. Larvae hatch in 5 to 10 days and take about a month before they are considered adult fungus gnats.
Outdoor fungus gnats can be found in the soil.If moving outdoor plants to an indoor grow it is recommended to check for fungus gnats before introducing the plant to its new environment.
How To Prevent and Control Fungus Gnats:
- -Keep the screens on the windows down all the time.
- -Keep the soil as dry as can be tolerated, meaning do not water unless it is really needed.
- -Put a piece of cloth over the soil so the gnats have nowhere to lay their eggs.
- -Place a potato down in the soil of the garden to check for larvae. If you see a bunch of little maggots on the potato after a half a day it is telling you that you have gnats larvae in there.
If you have fungus gnats in your garden, the following are commonly used items to get rid of them:
- -Insecticidal Soap
- -Neem Oil (We really love the brand “Dyna-Gro Pure Neem Oil”. It has shown to be very effective for getting rid of gnats and other insects in an organic method.)
- -Predatory Mites
- -Perlite (add on top of the media)
- -Use yellow sticky cards in the garden. Aphids are drawn to the color yellow and will fly into them and get stuck.
- -If you have larvae in your soil, let the top few layers of the soil dry out. Once the soil is dry, add a mixture of one part 3% hydrogen peroxide with 4 parts water and add the mix to your top layer of the soil. It will kill the larvae and not damage your plants. You can do this on a regular basis to assure the gnats never return. It is actually good for the soil to do.
Want to get trained online at the world’s leading cannabis training college?
To learn how to deal with all types of pests when growing cannabis, and to get tips from award-winning cannabis growers, sign up at the premier cannabis training institute.