How to kill fungus gnats amd their larvae quickly and efficiently?

The Happy Hippy

The Happy Hippy

Active Member
I mixed rubbing alcohol and water and spray the top level soil. That seems to kill the larvae without damaging the plants. And sticky traps for the adults. Seems to be working well but they're not completely gone yet.
 
MickFoster

MickFoster

Well-Known Member
Yellow stickies for the adult flyers and 3 drenches with Gnatrol for the larvae........works every time.
 
BluntMoniker

BluntMoniker

Well-Known Member
Water your pots from underneath. Allow the water to wick up from the bottom. If the gnats (and their larvae) don't have a moist/open environment they can't lay eggs there and multiply.

Or add 1in layer of sharp sand (used as an addition to concrete, can be found at Lowes or Home Depot) to your pots. The gnats are unable to penetrate through the sharp sand to lay eggs, and any eggs in the coco will be unable to hatch and start their life cycle. The sharp sand works similarly to diatomaceous earth in that it will litterally cut the gnats to pieces as they try to push their way through it, due to microscopic jagged edges and such. HAS to be sharp sand though, not play sand.. play sand is too fine and will end up getting into your soil and clogging things up.

The former option is a preventative measure, the latter will stop them both before and after your problem has begun. I like both of these methods personally, as they require no chemicals or sticky traps, and are effective
 
G

Greenbud209

Member
BluntMoniker said:
Water your pots from underneath. Allow the water to wick up from the bottom. If the gnats (and their larvae) don't have a moist/open environment they can't lay eggs there and multiply.

Or add 1in layer of sharp sand (used as an addition to concrete, can be found at Lowes or Home Depot) to your pots. The gnats are unable to penetrate through the sharp sand to lay eggs, and any eggs in the coco will be unable to hatch and start their life cycle. The sharp sand works similarly to diatomaceous earth in that it will litterally cut the gnats to pieces as they try to push their way through it, due to microscopic jagged edges and such. HAS to be sharp sand though, not play sand.. play sand is too fine and will end up getting into your soil and clogging things up.

The former option is a preventative measure, the latter will stop them both before and after your problem has begun. I like both of these methods personally, as they require no chemicals or sticky traps, and are effective
Click to expand...
I have sand i bought from lowes it has small rocks in it bot sure how well its wrking yet its only been about 4 days
 
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