Posted on by Jason G

Fungus Gnats 101

Fungus gnats are small flies very similar to fruit flies that belong to part of the Mycetophilidae and Sciaridae families.

They feed on decaying organic matter, fungi and plant roots (especially damaged roots making plant much more prone to diseases).

Fungus gnats are particularly dangerous to plants as they can also carry diseases such as Pythium on their bodies and have the ability to transfer it from plant to plant.

The life span of a fungus gnat consists of about 3-4 weeks depending on the conditions of the environment. Fungus gnats love, damp moist (overwatered) substrates, as they breed extremely fast in these conditions (up to 300 eggs in an adult’s life) and benefit from high humidity, so the threat of an infestation in the vegetation phase is more likely than in flower given that the humidity is at the correct setting.

Fungus gnats have 4 stages of life:

  • Egg
  • Larvae 
  • Pupae 
  • Adult


The eggs will hatch after about 3-6 days, hatching little larvae (Translucent maggot looking things)

The larvae feed on the fine root hairs of the plant and will do significant damage to nutrient absorption (the plants ability to uptake nutrients) if feeding on a seedling/cutting or an unestablished plant meaning there will be an insufficient amount of nutrients available for healthy growth.

Fungus gnats are pretty easy to control if the infestation isn’t too bad, but if infestation is bad, your fruits/flowers will act as sticky traps, leaving tiny gnats stuck to your flowers, which can cause things like bud-rot, mould and foul odours. Not to mention an unusable crop.

When treating such infestations, the current range of available products have generally been insufficient in their attempt to remove the problem. So, if avoiding harsh chemicals is a priority when treating the problem there is not much available that doesn’t impact other important growth factors.

Finally, though there is a product (Triple R, by Lost Labs) that is organic, restores the much need elements the fungus gnat removes during attack. So, not only does it remove the adult fungus gnats it completely destroys the larvae, replenishes the root zone and then restores ecological balance within the root-zone thus allowing the plant to experience minimal shock and carry on its reproductive cycle. 

Another Product that takes care of fungus gnats and their entire life cycle is gnatnix, click here to read more about the benefits of gnatnix!

If you have fungus gnats you can’t just leave it a day or two and then attempt to fix the problem, by that stage the number of larvae bred makes it very much an uphill battle to remove them.

Keep an eye out for a new product by Lost Labs; Triple R. Coming soon to A-Grade.

Remember that prevention is better than cure.