- Fri Jul 31, 2020 8:55 pm
Some people report success with putting mosquito dunks in your water jug for at least 24 hours, the gently top water to get the bacteria throughout the media. This is not a one time treatment, but a few weeks at least. Personally, it did nothing for my fungus gnat invasion, and you said bacterial treatments are difficult to come by in the UK.
Other people suggest hanging some yellow plastic smeared with petroleum jelly very close above your plants. Fungus gnat adults are attracted to yellow. They land, get stuck in the jelly, and you can sit back and laugh at their high pitched screams as they die. No adults, no larvae. I have not tried this.
I suggest getting a Ping. I have done this, and a single Ping solved my fungus gnat problem almost by itself. I had some Cape seedlings and, as they grew, they started catching the adults as well. But the Ping did about 90%of the work.
Everything happens for a reason. Sometimes the reason is that I make bad decisions.