Gnats

Vyp

Member
This is the third time my crop has been ruined by gnats! I’ve done everything. I just cloned my strains put them in the clone machine, waited a day and sprayed them with neim oil. I have new gbats a week later! It the vinegar bowl and on the yellow strips. I started the last grow out with all new seeds and still had gnats! Help!
 

Drop That Sound

Well-Known Member
Last time I had gnats.. I covered the smaller pots (with coco) with XXL panty hose.

I won't go into how it was kind of embarrassing standing in the women's isle for 30 minutes trying to find the right size while they smirked at me, but I'll tell ya it definitely works to keep the flyers from coming out and spreading. Wrap all the way around the pot and the main stalk, and rubber bandit. You can still water the pot and get runoff through the fabric, but the gnats can't get through it. Soon they will all hatch and turn into flyers, and all die in a week.

For the bigger pots, I had to fool around and cut the panty hose liners into sheets, and used metal tape to hold in on. That includes the bottom of the pots with the drainage holes, because they can get in through there too.



As for the other secret weapon that no one would probably believe me... I let the coco coir dry out almost all the way (bad I know), and tried something crazy that i though might work. I made some peppermint e-cig vape juice with twice the amount of flavoring as normal, and hooked a straw up to my vape devices drip tip. Stuck the straw up through one of the drain holes on the pot. I then blew through the airflow intake and vaped the hell out of the coco until it looked like the whole pot was smoking with fog.

I watched as all the fungus gnat larva wriggled there way to the top of the medium and died within 15 minutes!


I'm pretty sure the gnats came straight out of the bag of premixed amended coco I got from the grow store. There are little vent holes in the bags and the gnats can fly in and lay eggs. Or come infected straight from the factory. Gnat eggs can even go dormant for awhile I'm pretty sure, until you start adding water. I hardly ever use coco (been on break for awhile and usually grow hydro anyway) but when I do, I expand the compressed blocks with boiling water. If your using soil the risk is even higher for already being contaminated with gnat eggs IMO.
 

Vyp

Member
Moisture somewhere in the room.
It is dry everywhere. I keep an w
Last time I had gnats.. I covered the smaller pots (with coco) with XXL panty hose.

I won't go into how it was kind of embarrassing standing in the women's isle for 30 minutes trying to find the right size while they smirked at me, but I'll tell ya it definitely works to keep the flyers from coming out and spreading. Wrap all the way around the pot and the main stalk, and rubber bandit. You can still water the pot and get runoff through the fabric, but the gnats can't get through it. Soon they will all hatch and turn into flyers, and all die in a week.

For the bigger pots, I had to fool around and cut the panty hose liners into sheets, and used metal tape to hold in on. That includes the bottom of the pots with the drainage holes, because they can get in through there too.



As for the other secret weapon that no one would probably believe me... I let the coco coir dry out almost all the way (bad I know), and tried something crazy that i though might work. I made some peppermint e-cig vape juice with twice the amount of flavoring as normal, and hooked a straw up to my vape devices drip tip. Stuck the straw up through one of the drain holes on the pot. I then blew through the airflow intake and vaped the hell out of the coco until it looked like the whole pot was smoking with fog.

I watched as all the fungus gnat larva wriggled there way to the top of the medium and died within 15 minutes!


I'm pretty sure the gnats came straight out of the bag of premixed amended coco I got from the grow store. There are little vent holes in the bags and the gnats can fly in and lay eggs. Or come infected straight from the factory. Gnat eggs can even go dormant for awhile I'm pretty sure, until you start adding water. I hardly ever use coco (been on break for awhile and usually grow hydro anyway) but when I do, I expand the compressed blocks with boiling water. If your using soil the risk is even higher for already being contaminated with gnat eggs IMO.
Thanks for the tip. I’m using soil. I’ve thrown out everything except the pots and started over with new bags, new seeds and new clones twice. I’ve bleached everything, the walls, pots, clone machine. I’ve used peroxide diluted water in my plants carefully. I put sand in the bottom of my pots and on the top. I’ve used dimacious powerder (I know that’s not spelled right) I grow indoors and it’s costing me a fortune. Thank you for the tips. Much appreciated.
 

green_machine_two9er

Well-Known Member
Gnats indicate that your top few inches of substrate are staying to wet. You have to fix your watering.
Gnats come with anaerobic environment in your medium.
That’s not really true. Gnats actually prefer aerobic medium. Fungus gnats eat decomposing fungal matter. Not the organic matter but the fungi that is breaking down the organic matter. Fungi prefer a wet dry cycle. Usually gnats get worse when people start watering less. What they hate is consistently watered containers where biologist works itself out snd natrural deterrent will be alive and well in soil.

maybe less water by volume but water every single day!!!
 

Drop That Sound

Well-Known Member
Welcome. I can't stand gnats. They are the worst pest IMO. Something about the way they land on you and crawl across your face\hands while your working. I would get pissed and blow clouds of vape on them, hoping the nicotine would dumb them down and deter them from landing on my face.. It did, and that's how I got the idea to smoke out the root system too.

Not to mention, they can spread disease to your plants and cause root rot. Even in hydro (DWC) with net pots. They really liked root riot starter cubes for some reason, which I now call root rots, and only use small bits of rockwool instead.

Oh ya, and I've heard that mites can hitch a ride on their back, lol.
 

drbudkilo

Member
BTK spray .
This is the third time my crop has been ruined by gnats! I’ve done everything. I just cloned my strains put them in the clone machine, waited a day and sprayed them with neim oil. I have new gbats a week later! It the vinegar bowl and on the yellow strips. I started the last grow out with all new seeds and still had gnats! Help!
Btk spray is non toxic and specifically for fungus gnats. 100% effective
 

Cappuchino

Well-Known Member
That’s not really true. Gnats actually prefer aerobic medium. Fungus gnats eat decomposing fungal matter. Not the organic matter but the fungi that is breaking down the organic matter. Fungi prefer a wet dry cycle. Usually gnats get worse when people start watering less. What they hate is consistently watered containers where biologist works itself out snd natrural deterrent will be alive and well in soil.

maybe less water by volume but water every single day!!!
Fungus gnat females lay small, yellowish-white eggs on the surface of moist soil.
...these gnats most commonly leave their eggs in rich, damp soil ...
If you have an infestation in potted plants, let the soil dry completely between watering periods. Never overwater houseplants.
Control
Preventing Fungus gnats can be as simple as not overwatering indoor plants or else tossing away infested plants.
 

green_machine_two9er

Well-Known Member


Wow thanks boss. When I am worried about my Christmas cactus I’ll refer to this link…
 

hillbill

Well-Known Member
I know I have brought in gnats with commercial EWC, bagged compost and like products. Got tiny ants from EWC also.
 

Skunkbudz

Well-Known Member
Last time I had gnats.. I covered the smaller pots (with coco) with XXL panty hose.

I won't go into how it was kind of embarrassing standing in the women's isle for 30 minutes trying to find the right size while they smirked at me, but I'll tell ya it definitely works to keep the flyers from coming out and spreading. Wrap all the way around the pot and the main stalk, and rubber bandit. You can still water the pot and get runoff through the fabric, but the gnats can't get through it. Soon they will all hatch and turn into flyers, and all die in a week.

For the bigger pots, I had to fool around and cut the panty hose liners into sheets, and used metal tape to hold in on. That includes the bottom of the pots with the drainage holes, because they can get in through there too.



As for the other secret weapon that no one would probably believe me... I let the coco coir dry out almost all the way (bad I know), and tried something crazy that i though might work. I made some peppermint e-cig vape juice with twice the amount of flavoring as normal, and hooked a straw up to my vape devices drip tip. Stuck the straw up through one of the drain holes on the pot. I then blew through the airflow intake and vaped the hell out of the coco until it looked like the whole pot was smoking with fog.

I watched as all the fungus gnat larva wriggled there way to the top of the medium and died within 15 minutes!


I'm pretty sure the gnats came straight out of the bag of premixed amended coco I got from the grow store. There are little vent holes in the bags and the gnats can fly in and lay eggs. Or come infected straight from the factory. Gnat eggs can even go dormant for awhile I'm pretty sure, until you start adding water. I hardly ever use coco (been on break for awhile and usually grow hydro anyway) but when I do, I expand the compressed blocks with boiling water. If your using soil the risk is even higher for already being contaminated with gnat eggs IMO.
Joe Namath....enough said!
 
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