Fungus gnats

VincenzioVonHook

Well-Known Member
Environmental control. Make sure humidity isn't too high, don't keep the top of the medium wet, and if the problem is too bad, put some diatomaceous earth on top of the medium and feed from the bottom for a few days until the top dries out and the gnats no longer have an optimal environment.

Sticky traps (yellow) are a few dollars. Use them. Lifesavers.
 

VincenzioVonHook

Well-Known Member
If it's indoors in a tent, make sure you put something like a stretched stocking over the intakes so the can't get in, and have an exhaust with a filter to limit access.

If there's us larvae in the medium, the diatomaceous earth will dry them out as well.
 

victoryou

Well-Known Member
Environmental control. Make sure humidity isn't too high, don't keep the top of the medium went, and if the problem is too bad, put some diatomaceous earth on top of the medium and feed from the bottom for a few days until the top dries out and the gnats no longer have an optimal environment.

Sticky traps (yellow) are a few dollars. Use them. Lifesavers.
Thanks man! Yesterday my bro wattered them a little to much i guess i will let them dry for one day.
 

xtsho

Well-Known Member
I rarely have issues with gnats but when I did I would just spray the surface of the substrate with neem oil every few days. I don't use neem oil anymore and have since switched to sesame oil which is completely edible, organic, and won't harm your plants. Plus I have it in my kitchen cupboard. It's the active ingredient in several organic insecticides and can be purchased at the grocery store for $5 or less.

But the best way to control gnats is to eliminate the conditions in which they thrive. Overwatering is usually the culprit.
 

jondamon

Well-Known Member
I rarely have issues with gnats but when I did I would just spray the surface of the substrate with neem oil every few days. I don't use neem oil anymore and have since switched to sesame oil which is completely edible, organic, and won't harm your plants. Plus I have it in my kitchen cupboard. It's the active ingredient in several organic insecticides and can be purchased at the grocery store for $5 or less.

But the best way to control gnats is to eliminate the conditions in which they thrive. Overwatering is usually the culprit.
Would you share your sesame oil mix ratios or do you use it neat?
 

xtsho

Well-Known Member
Would you share your sesame oil mix ratios or do you use it neat?
1.5 tsp per quart. You don't need to drench just get the top 1/4 inch or so wet with a sprayer.

They don't give any ratios or formulations in this document but it's an interesting read regarding use of sesame oil as a pesticide.

Sesame and Sesame Oil Profile
Active Ingredient Eligible for Minimum Risk Pesticide Use

 

Doug Dawson

Well-Known Member
Many use different products for these little suckers quite successfully. I have read a bunch of articles about using steel wool to control these pests. Cover the medium with it and just keep feeding as normal. The idea is the knats can't get to the medium to lay eggs and the larvae can't make it through the steel wool when they emerg. This apparently works well and costs next to nothing so might just be worth trying. Good luck.
 

VTHIZZ

Well-Known Member
Here's what i used

I sprayed it on the soil just enought to seep down a bit, the next day i watered as i normally would. I kept a fan close by blowing air near the top soil. After the top soil dryed from watering, i did another spray for the top soil. Also added the little yellow stickys.. a week later i have no gnats


1621884369401.png
 

xtsho

Well-Known Member
Many use different products for these little suckers quite successfully. I have read a bunch of articles about using steel wool to control these pests. Cover the medium with it and just keep feeding as normal. The idea is the knats can't get to the medium to lay eggs and the larvae can't make it through the steel wool when they emerg. This apparently works well and costs next to nothing so might just be worth trying. Good luck.
Gnats are really easy to get rid of. They're more of a nuisance than anything. Especially if your veg tent is in your computer room and they keep flying around the screen at night. Little bastards drive me crazy. Fortunately I rarely get them and when I do I eradicate them in a few days. I've heard of using steel wool.

Here's what i used

I sprayed it on the soil just enought to seep down a bit, the next day i watered as i normally would. I kept a fan close by blowing air near the top soil. After the top soil dryed from watering, i did another spray for the top soil. Also added the little yellow stickys.. a week later i have no gnats


View attachment 4908337
That Bonide is just Neem oil. But it works the way you used it and that's all that matters.
 

SheeshM

Well-Known Member
Gnatrol, yellow stickies and alternate bottom feeding with top feeding. If you have a lot of fliers, whack the containers to stir them up then suck them out of the air with a shop vac.
 

Lagged

Well-Known Member
Use diatomaceous earth as a last resort - but there are plenty of methods that won't destroy your microbial life.

Stick traps
Don't overwater
Mosquito bits
Neem Oil
Hypoaspis Miles

but most importantly

NEMATODE SF - this will save your life. Get them from nature's good guys and apply as directed. That combined with other methods will massively improve your situation

I had major gnat problem on last run - switched to fabric pots and controlled my watering, haven't seen once since. PromixHP (or any high porosity medium) is great for this.
 

ebcrew

Well-Known Member
Im actually having an infestation of fungas gnats for the first time, and i can attest that mosquito dunks dont work. Unless im a moron, and doing it completely wrong.
 

madvillian420

Well-Known Member
nematodes work wonders if you apply a lot of them, just with a bit of a delay (about a week or 2)

If your infestation isnt too bad a few handfuls of perlite on top and a fan on high hitting the soil can be pretty useful too.

also try the search function man, this subject has been discussed many many times. you can read first hand experiences with what worked/didnt
 

Budzbuddha

Well-Known Member
Scratch in a top layer of neem meal ( down to earth brand or similar ) , it will take care of medium . Yellow stickies for the adults .
Neem is also a great soil conditioner and beneficial to medium.
 
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