Soil drench for gnats

Mikelovestotrynewthings

Mikelovestotrynewthings

Member
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!
 
FirstCavApache64

FirstCavApache64

Well-Known Member
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.
 
PJ Diaz

PJ Diaz

Well-Known Member
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.
 
buckaclark

buckaclark

Well-Known Member
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
 
Hippiechik

Hippiechik

Well-Known Member
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.
 
T

Toka416

Well-Known Member
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.
 
Rurumo

Rurumo

Well-Known Member
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.
 
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