Anyone try Hydrogen Peroxide for fungus gnats?

dave1960

dave1960

Active Member
RockyMtnMan said:
Yeh I noticed them sneaking in through the drain holes also. I used cut up old nylons, slid up the pot a few inches to cover the drain holes. Keeps em out of that entrance.
I noticed this morning, there was no new flyers visibly present. ( I stir up the soil and rock the pots back and forth to agitate them) I relaced all the traps and hanging strips and there are virtually no specks on them. Some of the traps are spotless! I'm not even sure the specks I saw weren't dirt.
The soil is very light and airy on the top couple inches and it seemed to have no adverse effect on the plants.

I am only a couple days from moving new seedlings and clones from the nursery to the veg tent and if I see one of those bastards.....

I noticed these gnats will significantly damage juveniles, cuttings and seedlings the most. Anything with a small underdeveloped root system. The adults apear harmless, but the hidden little larvae eat the shit out of your roots. I will NEVER place seedlings or cuttings anywhere near those little bastards. You can have vegging 12" plants that just plow along in your tent with no visible damage next to some 3-4" little seedlings or cuttings and your babies will fight to live and seriously stunt their growth.

I used the tent to start a bunch of tomatoes, chilis, and a few other veggies and nearly all my little garden seedlings only made it a couple weeks after they left the dome and went in the tent.
The larger, vegging pot plants next to them continued to grow. (little did I know what was going on under the soil)

What pisses me off the most is, I run a clean environment. I sweep regularly, remove my deadfall, wipe and dissinfect. I run a clean ship, but these gnats came in the soil!
If the companies are using correct composting techniques, the temps in the compost should reach a high enough temerature to kill eggs and larvae.
If you make your own soil (which is what I did) you have to be carefull. I followed a recipe from a reputable grower and the soil has worked beautifully, except for the gnats. If I decide to make soil again, I will be extremely carefull in my selection of the compost I use.
I am going to be researching coco coir as a new medium.
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Ive been reading this whole thread and its a good one....
 
DemonTrich

DemonTrich

Well-Known Member
picked up some goGnats yesterday at the grow shop. I have a gnat issue. little fuckers came in a bag of outdoor soil my wife used INDOORS!!!. fuckin dumb bish cant freakin read!!! then somehow made their way into my basement grow area. needless to say im pissed, as im 4.5 weeks into flower. using this every water only cycle (1x a week). oh, my basement is impeccably clean, and I wear a tyvec paint suit when entering my grow area with separate shoes. im really anal about bugs and carrying in other crap.
 
Forrestfirebuds

Forrestfirebuds

Member
How long do i wait until i can repopulate my coco with beneficial bacteria after i just used water/hydrogen peroxide to kill off fungus gnat larvae? Thanks guys
 
Forrestfirebuds

Forrestfirebuds

Member
DemonTrich said:
Wouldn't the residual H202 still compromise any benies? Maybe a few waterings to rid the residual
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Yeah im not exactly sure. I know that the hydrogen peroxide breaks down into water and hydrogen eventually but not sure how long that takes. I guess i can look that up and like you said just wait dor a few waterings.
 
NYFlowerpower631

NYFlowerpower631

Active Member
I use Trifecta and the stuff works like a charm soak the top of soil spray the plant (even during flower) can use up to 5 days till harvest. Anyway spray plant till it’s dripping and soak top of the soil it gets rid of gnats thrips and a lot of amphids. I usually spray all that I said and I stick the nozzle into drainage holes and give a nice squirt and spray down the pots and saucers if needed depends on how bad gnats are. Usually before I even see the bastards I spray plant and soak the top layer of soil and then apply a layer of sand. I honestly haven’t delt with them in a few years until I just started my next runs seedlings 6 days old and I noticed a couple flying around then seen a few suckers moving around on top of my coco coir just got done spraying and soaking with Trifecta and prittey confident they will die as with the larva✌
 
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