How do you deal with fungus gnats?

I think there's fungus gnats in my soil but I grow in promix bx mycorrhizae and I want to get rid of the fungus gnats without killing the mycelium. Any tips?

Zakfred said:

I think there's fungus gnats in my soil but I grow in promix bx mycorrhizae and I want to get rid of the fungus gnats without killing the mycelium. Any tips?

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Let the soil fully dry between waterings, dust the top of the soil with diatomaceous earth, and use yellow sticky traps. Overwatered soil is the main cause of fungus gnats.

Bt and yellow sticky traps.. I use gnatrol off ebay but Monterey makes one or microbe lift.

Apple vinegar traps

Less water...more airflow

In truth did all 3 of them so good luck

kmog33 said:

more airflow

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I forgot that. Air circulation under the canopy is CRITICAL. You can scrog a tent out and pack it with plants but you gotta have air circulation ABOVE and UNDER. Ive always been a bit crazy with air circulation but I had gnats from fresh bags of soil and they all died very quickly. Ive never had any bug infestation knock on wood. Theres not really any part of my tent that is a "good comfortable place" for any bugs. Way to much air movement, low humidity, powerful light, etc etc.

Sticky traps and shaking the plants and clapping what flies out, actually caught one like karate kid between finger and thumb the other day felt like I was Neo from the Matrix

Yellow stickies for the adult flyers and 3 drenches with Gnatrol for the larvae in the soil.

spliffendz said:

Sticky traps and shaking the plants and clapping what flies out, actually caught one like karate kid between finger and thumb the other day felt like I was Neo from the Matrix

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I just have an image of a cloud of gnats and you being very impressed with yourself.

Same problem here, used gnatrol sticky traps and let plants dry to point of wilting and the fuckers are getting worse! Can i cover tops of pots with saran wrap? Oh and i almost forgot covered top of soil with diametaous earth

beercan said:

Same problem here, used gnatrol sticky traps and let plants dry to point of wilting and the fuckers are getting worse! Can i cover tops of pots with saran wrap? Oh and i almost forgot covered top of soil with diametaous earth

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You must be watering way to much if they are still getting worse. Put up a bunch of yellow sticky traps and water less.

JoeBlow5823 said:

You must be watering way to much if they are still getting worse. Put up a bunch of yellow sticky traps and water less.

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Plants are wilting in between waterings, got sticky traps galore, may cover tops with sand also but was curious about covering top of pots with saran wrap too, not sure what other problems that may cause though

beercan said:

Plants are wilting in between waterings, got sticky traps galore, may cover tops with sand also but was curious about covering top of pots with saran wrap too, not sure what other problems that may cause though

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Yeah i wouldnt do that.

JoeBlow5823 said:

Yeah i wouldnt do that.

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Seems like it may cause algae and all kinds of other bad shit to happen, got soil from a new place and thats when shit hit the fan!!

BMC Microbe Lift Biological Insect control.

3-4 Drops per gallon of water. Use when watering plants. .. Kills larvae.

Sticky traps to get rid of adults.

Worked for me

Hypoaspis miles. I'd just topdress with EWC if you're in soil.

Captain Jacks Dead Bug Brew by Bonide @ 2 oz per/gallon of water.


Apply using sprayer onto any soil surfaces including the drain holes of pots and spray into trays, the product contains Spinosad which is a bacteria that kills thrips & gnats like no other but isn't super toxic or poisonous to us at least.. Every 7 days or whenever an issue is spotted, you cannot really over do it as long as you follow dosing.

I'm pretty sure I picked up 1 quart of it at my local grow store for $20 out the door.

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Sticky traps are an excellent suggestion although they are only going to show an issue is present they will not kill larvae that are feeding on your roots or gnats that are able to avoid the traps. Personally I use a flying insect catcher called "katchy" from Amazon in the grow 24/7 just make sure the light stays away from direct plants if possible.

PadawanWarrior said:

Hypoaspis miles. I'd just topdress with EWC if you're in soil.

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Really, earth worm castings huh??

beercan said:

Really, earth worm castings huh??

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Ya, most EWC should have some hypoaspis miles mites in it. Even the Wiggle Worm brand had a bunch of them. It's not instant though. And then yellow sticky traps for the fliers. I'm still using the same soil and I haven't seen a gnat in 2 years now.