Fungus gnats -- some good inexpensive ways to dispense with them

[Ray]

If you focus on just killing the gnats, you're fooling yourself.

Where there are fungus gnats, there are both fungus and gnat larvae. It's a good indicator that you need to repot, as the medium is decomposing rapidly.

[RosieC]

Originally Posted by Ray

It's a good indicator that you need to repot, as the medium is decomposing rapidly.

However once you've got them, and unless you kill all the larvae then you will probably have them even in fresh medium. They are in all of mine including the recently repotted (into very fresh medium) but I know that unless I get rid of them in all plants at once they will just settle back into the repotted ones soon after the repotting.

Before I had the carnivorous plants even my ones in Lecca would have them coming up out the pot when I watered.

As Ray has said the only way to completely get rid of them is to kill the Larvae as well as the flies. If I could find a good method of that in the UK I would, for now I control the numbers rather than irradiate them.