Does anyone have experience using citric acid in seed trays as a drench to kill fungus gnats and larvae?
No, but crumbled mosquito dunks works really well.
Thanks…I use that same Bacillus via this product in liquid from Amazon. I think after many years of use, I’ve created some resistance, so need to find another solution for a bit. MICROBE-LIFT BMC Biological Mosquito Control, Liquid Treatment for Medium-Sized Decorative Water Gardens Up to 2,000 Gallons, Fountains and Ponds, 2 Fluid Ounces