[destined]

I had a really bad fungus gnat infestation. I tried sticky traps, BT, and water with Fels Naptha soap. In the end, drying out the soil was the only thing that worked for me. I did it two different ways, but not sure if this is doable in your situation with veggies and planter boxes. For an avocado plant, I let the soil dry completely and then some before watering the plant again. The other was a money tree where I couldn't get the soil to dry fast enough, so I ended up repotting it with cactus mix. Once deprived of water, the fungus gnats disappeared.