From here:How to get rid of soil fungus gnats the right way?
Once the soil is dry, mix 1 part hydrogen peroxide (H2O2) solution with 4 parts water.
Use 3% solution, which you can find in any drug store or in the hygiene/medicine aisle
of a chain grocery store.
Bleach sounds harsh.
Hydrogen peroxide works nicely and I have tried this.
From here:
https://www.howtogetridofgnat.com/2...gnat-using-hydrogen-peroxide-insecticide.html
I don’t feel like h202 kills the larvae
H202 will def kill everything along with your bennies. Just did it to kill springtails
For 35% h202
I have tried the 4:1 H2O2 method and it didn't even affect them. I did a drench with Gnatrol BT 3 times in 10 days and it killed them dead.
I have tried the 4:1 H2O2 method and it didn't even affect them. I did a drench with Gnatrol BT 3 times in 10 days and it killed them dead.
Gnatrol is pro grade stuff. I get them periodically in my organic soil mix. A single application to wet the soil at 1 tbsp/gal whups the hell out of them. 3 applications a week apart is recommended for heavy infestations.
I tried to eradicate them completely a couple of times but it's just impossible using organic ingredients. When I see more than a few on the fly strip in the enclosure it's time for a beat down.
Just make sure to dilute the H2O2. I flushed my coco with undiluted 3% solution and it has pretty much killed the plants from the inside.
Nope, totally dead. Stupid mistake on my part.
Maybe I will have to try the gnatrol. Is it expensive? Have you ever tried tanlin?
Yea do you think the gnatrol works good as a preventative measure? And how long does it stay alive in the soil if it does?