MUD GNATS

Hello my friend, you can use the yellow tape like you've got to catch the flies but you need to use nemotodes to kill the larvae. The larvae is what is hurting your plant by eating your roots. The nematodes are parasites that kill the larvae. This is the best way to kill them, the second best way is neem oil. Both will kill them very fast. But to prevent it in the future let your soil dry out in between watering!

If you already are suffering from an infestation the best way to get rid of them is to let the top part of your soil dry for a couple of days. This will make the gnats go look for another place to lay the eggs and the larvae will die. Be sure to do the same to all the plants in your grow room or they will just migrate to the nearest plant. If there are too many of them and you can’t deal with them this way, you can use yellow sticky cards, Neem Oil, or an organic powdered insecticide to sprinkle on top of the soil. While yellow sticky cards and neem oil will only take care of the adults and powdered insecticide of the larvae, you will need a combination of them both to effectively get rid of all of them.

Be aware of what you can find on the internet… Against fungus gnats you can use diatomaceous earth, sand, straws on top of soil. Never used baking soda personally.