How much h202 to kill fungus gnat larvae?

[foliage2018]

Did you try add neem oil directly to the water? I had fungus gnat previously but never get rid of them with H2O2.

 

[ANC]

At the very least start with a few of those yellow sticky pages on your pots. They really have quite an impact on small grows if they are there from the start.
These fucking midges seem dead set on flying into it.

 

[Roger A. Shrubber]

i've put 6 ml per gallon into a plant that was healthy, and it fucking killed it...it ate all the rootlets and left only the large "cable" roots, which are incapable of supporting a large healthy plant.
you can say whatever you want, but i'm never using over 3 ml per gallon of anything over 30%....and have absolutely no reason to, that seems to be entirely strong enough to keep my hempy bucket resses sterile and fresh smelling. using more would be both a waste and bad for the plants.

 

[5BY5LEC]

i've put 6 ml per gallon into a plant that was healthy, and it fucking killed it...it ate all the rootlets and left only the large "cable" roots, which are incapable of supporting a large healthy plant.
you can say whatever you want, but i'm never using over 3 ml per gallon of anything over 30%....and have absolutely no reason to, that seems to be entirely strong enough to keep my hempy bucket resses sterile and fresh smelling. using more would be both a waste and bad for the plants.

Shrubber is dead on about the H202. I found out the hard way.
I once used 120ml/20gal of 35% which is about 6ml per gallon trying to clean my system when I got the slime.
Holy shit......you ever watched your girlfriend use Nair, and wipe all the hair off her leg??
Thats what it did to the roots. I had to WIPE them off the sides of the netpot. A disaster.
The things took like 2 weeks to get going again, surprised they lived at all.

 

[GrownwithCare]

10 ml per gallon of 35 percent? What? That's way too much. Nice try though

not sure about deep water culture but in soil i use 1:100 (1gal/100gal) but ive heard of people doing 1:10.(not recommended and i dont know how they didnt kill their plants. i would suggest letting it sit for 10-30 minutes with (no aerator only circulation) depending on how much you added

 

[Failmore]

From the grave!!!

 

[thetruthoverlies]

Gnats....I hate those god damn things with a passion. BT products work well in conjunction with sticky traps. Nematodes usually obliterate them and FAST.

Dunks have BT and will help knock em down.

Buildasoil has a IPM recipe that includes neem and their essential oil blend. That route is the most economic. The essential oil blend smells good and the bugs hate it.

Use extreme prejudice on those bastids.