Gnat control

Treat all of them. The "baby" gnats are little grubs living down in the soil. I use 1 part hydrogen peroxide to 4 parts plain water to kill them. You will hear a sizzling sound when you water with this mixture; that's the baby gnats dying. This remedy won't hurt your plants. Good luck!

 

Also, for the flying buggers, pyrethrum spray works wonders and is non-toxic - can even use during flower

 

The Mook 3 pronged attack/defense.
1. Yellow sticky cards hung between light and canopy (don't block light though). Traps adults. Available at hardware/ garden shoppes.
2. Mosquito bits to go after the babies. 1-2 tbsp sprinkled atop soil. Water through the bits.
3. Hydroguard - Keeps roots healthy by fighting root fungus. Makes roots less attractive to fungus gnat larvae. Also makes the watering learning curve for new growers more forgiving.
3.5 - Reapply bits about every 4 weeks.

I use this now with every grow. Never know if those buggers are sneaking in with the soil, so better safe than sorry.

Be kind. Perfect your craft. Give more than you take. We are family.

 

The sizzling sound is actually the peroxide breaking into water and oxygen due to enzymes in the soil. Not saying it doesn't work, just clarifying the reaction.
Signed,
Amateur chemist and husband of botanist.

Be kind. Perfect your craft. Give more than you take. We are family.

 

adding a fan has worked wonders for me. the yellow sticky cards haven't worked very well, but the breeze from the fan disorients the flying gnats. So instead of finding gnats climbing on my leaves and on top of the soil, they're on the floor of my grow room trying to get their bearings, making them easy targets for a swatting.

 

This is a great point. Canopy fans discourage well flying pests. They hate the turbulence.

Be kind. Perfect your craft. Give more than you take. We are family.