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!
Gnats
- Thread starter Vyp
- Start date
Exotic Reggie
Well-Known Member
Moisture somewhere in the room.
Jim Haddar
Well-Known Member
You grow in soil? Try diatomaceous earth. Also Bt is supposed to be good for the little bastards.
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.
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.
Jim Haddar
Well-Known Member
I think I once got rid of them by adding a little medical peroxide to the water. Plants can tolerate it if it’s diluted.
Southernontariogrower
Well-Known Member
Turn fans up and topdress pots, l use hydracorn but sand works and is cheaper, dont fly well and dont crawl upwards well either.
Cappuchino
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.
Gnats come with anaerobic environment in your medium.
It is dry everywhere. I keep an w
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
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.
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.
Cappuchino
Well-Known Member
Get Rid of Fungus Gnat Larvae: What Does it Look Like? | Orkin
Learn how to get rid of fungus gnat larvae. What does it look like? Do they live in soil? Read about what they look like, control, prevention, and more. For more information on help with controlling fungus gnat larva, call Orkin.
How to Identify and Get Rid of Fungus Gnats | Orkin
Fungus Gnats and their larvae can be found in plants and elsewhere in your house. Read on to learn more about them and how to stop an infestation.
MickFoster
Well-Known Member
Didn't you like the responses in your thread yesterday?
I answered that one.
I answered that one.
green_machine_two9er
Well-Known Member
Wow thanks boss. When I am worried about my Christmas cactus I’ll refer to this link…Get Rid of Fungus Gnat Larvae: What Does it Look Like? | Orkin
Learn how to get rid of fungus gnat larvae. What does it look like? Do they live in soil? Read about what they look like, control, prevention, and more. For more information on help with controlling fungus gnat larva, call Orkin.www.orkin.com
How to Identify and Get Rid of Fungus Gnats | Orkin
Fungus Gnats and their larvae can be found in plants and elsewhere in your house. Read on to learn more about them and how to stop an infestation.
MyBallzItch
Well-Known Member
Unless you're in Canada, gotta go gnatrol
MickFoster
Well-Known Member
To repeat what I said in your other thread.
Yellow stickies for the adult flyers and 3 drenches with Gnatrol for the larvae.
Yellow stickies for the adult flyers and 3 drenches with Gnatrol for the larvae.
Skunkbudz
Well-Known Member
Joe Namath....enough said!