Soil drench for gnats

Hey folk. Anyone know a recipe for neem oil and water for a soil drench if not a better alternative.
There are about 2 to 3 of the little blighters that dont live very long when I tap the pot every lights on at 12 12.
In week 3 of flower so not really that concerned but would be handy still.
Many thanks!

Gnatrol. You can find it on amazon and ebay in small quantities.
You will need sticky traps for the flyers, should be gone in a couple weeks.

I'll second the Gnatrol as well as hydrogen peroxide at a 1:3 ratio of peroxide to water. Soak it good and with the peroxide don't be alarmed when it fizzes and bubbles up. I like to use both switching between each treatment. The yellow sticky traps are definitely needed to help catch the flyers. After treating, try to let the top few inches of soil dry out thoroughly.

Welcome mnug

Cheers guy's! Very kind of you all to get back so quick ! Thank you

If you can't find gnatrol, look for the same ingredient (bT) found in either mosquito dunks/bits or microbe-lift bmc (in petstores for aquariums).

PJ Diaz said:

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I tried this in the past. Imo there’s way cheaper ways to handle fungus gnsts. Look at lost coast ingredients and justify the cost? Main ingredient citric acid. Dirt cheap

Home depot $10.00 With the outside insect control like Citronella candles.
Crush one up with pliers or a hammer and sprinkle some under each plant.
Lasts 30 days
Water less.

bam0813 said:

I tried this in the past. Imo there’s way cheaper ways to handle fungus gnsts. Look at lost coast ingredients and justify the cost? Main ingredient citric acid. Dirt cheap

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Actually the main ingredient is water, and then soybean oil (38%). Citric acid is pretty far down in the list at 0.25%. I ended up trying it in the past when gnatrol wouldn't work, but this did. Doesn't have to be Lost Coast either, just needs to be an oil based insecticide.

PJ Diaz said:

Actually the main ingredient is water, and then soybean oil (38%). Citric acid is pretty far down in the list at 0.25%. I ended up trying it in the past when gnatrol wouldn't work, but this did. Doesn't have to be Lost Coast either, just needs to be an oil based insecticide.

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Summer weight dormant oils for trees are awesome for pests

diatomaceous earth is good too & inexpensive, use as a preventive

Good luck

PJ Diaz said:

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I wouldnt spray that stuff on my plants in flower.

Boatguy said:

I wouldnt spray that stuff on my plants in flower.

https://cdn.shopify.com/s/files/1/1289/2041/files/SDS2020_Lost-Coast-Plant-Therapy-Concentrate-US-EN-13-sds.pdf?311

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I wouldn't either. I generally don't spray anything on my plants when in flower though, at least not after week 3. The topic was a soil drench though.

I use mosquito bits- it’s the same product as the dunks, but it’s granular. Mosquito bits on Amazon

I like to mix it in with my grow media, as well as add it to my hydroponic reservoirs. Don’t be surprised to see white fuzzy mycelium emerging from it, it’s perfectly normal and is harmless to anything except the gnats.

You can also add some to a bucket of water and let it soak, then strain it and use that to water with. I find it’s just easier to mix the granules into the soil.

PJ Diaz said:

Actually the main ingredient is water, and then soybean oil (38%). Citric acid is pretty far down in the list at 0.25%. I ended up trying it in the past when gnatrol wouldn't work, but this did. Doesn't have to be Lost Coast either, just needs to be an oil based insecticide.

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Thanks for info! Trying to make a cheaper homemade spray for myself. Gonna try soybean oil, lemon juice and iso.

I use the dunks for gnats as well. Seems is a matter of numbers for giving good info. The more correseponding answers kinda points people in the right direction i guess.

It might not be a bad idea to to consider some sort of wetting agent if you’re trying to make up an oil/water solution. Even a little dish soap can work in a pinch.

Neem works at 5 ml oil per liter of water for a soil drench with an emulsifier-I like powdered yucca extract for a lot of reasons. Usually, if you drench the pot with it once, then follow up with surface sprays for a week, it will take care of them. Citric Acid is effective in a very wide range of dosages in foliar sprays, which is why you see it range from .02% to 1% of a formulation (dilution aside). I like to use the 5ml neem/liter water and add 300 mg of Citric Acid (plus yucca) to that for foliars (but not for soil-the PH is in the 4s)-plants love it! Citric Acid is beneficial in a lot of ways besides just being a great PH down-https://agris.fao.org/agris-search/search.do?recordID=GB2020700053

After you treat the soil this way, place a yellow sticky trap in each pot, and if you see a fly appear, spray the surface of that pot (try to soak the top inch) with the neem oil/water. I've found I don't need to retreat everything, just the offending pot. I go through this every time I use fresh Canna but it works well.

Cinnamon scratch through and sprinkle on top, but first, fans off!

Kills larvae, adults can't land to lay eggs and benefits your roots!

Ground need seed/meal is another preventative option to add to soil as well. Its also a source of nitrogen in some living soil/super soil mixes.