fungas gnats? - GreenPassion.org - Dedicated to Medicinal Cannabis Cultivation and Education

nyk8 · #1 (**permalink**) 10-08-2009, 02:45 PM

i have used neem oil, sm-90, gnat control a white liquid that smells like fresh cut wood, i have put sand on top of the soil, i have watered from the bottom to keep the top dry. and they are still tons of gnats. any help would be great thanks

SomeDude · #2 (**permalink**) 10-08-2009, 02:46 PM

use cinnamon as a top dressing, you can water your plants with chamomile tea and get some ladybugs.

I have a thread about this somewhere on here

ISO2BWELL · #3 (**permalink**) 10-08-2009, 05:41 PM

Gnatrol - it does a great job of killing all the babies, and in just a few days the problem is gone.

Amazon.com: Gnatrol WDG - 60 grams: Home & Garden

Hang some sticky pest strips near all air-access points to catch the "inbound" buggars, feed the plants Gnatrol once a week for 3 weeks, and no more gnats..

ISO

jangel · #4 (**permalink**) 10-08-2009, 06:57 PM

I cannot get that here, ISO, but i will try that link and see if they will ship it here. I just can't seem to get rid of the damn things

sabasi · #5 (**permalink**) 10-08-2009, 07:30 PM

Cinnamon works for me here but Iv'e never had more than a few of them in my cab.

Lumix · #6 (**permalink**) 10-08-2009, 07:54 PM

Works Cin a min in i mnm

Tetrahyc · #7 (**permalink**) 10-08-2009, 08:07 PM

Diatomaceous Earth, sprinkled on top of the media. Will help.

Lumix · #8 (**permalink**) 10-08-2009, 08:17 PM

The HSIC · #9 (**permalink**) 10-08-2009, 08:50 PM

When none of that works for you, simply grow a garlic bulb or 2 inside the grow.
Their 'homebase' may not be you plants but another moisture source.
Check the wicking/evaporator pad in all humidifiers/dehumidifers.
They go where the moisture is, so, when all else fails, grow garlic because it likes
to be WET all the time and is a natural gnat-pisser-offer.
The little buggers can't help themselves and will lay eggs in the garlic pots.
Garlic = dead gnat eggs.

Tetrahyc · #10 (**permalink**) 10-08-2009, 08:53 PM

I always forget. The potato slices !!

Put pieces of potato on top of the media, the maggots love it.

jangel · #11 (**permalink**) 10-08-2009, 08:56 PM

I am going to do that! Thanks so much Tho!

And tet! I did know that but haven't done it in a while.

Peace

Lumix · #12 (**permalink**) 10-08-2009, 09:55 PM

A bartender in Maui Hawaii showed me a trick to avoid giving free drinks away because of the fruit flies was a cup of cider vinegar 10 ft away from the bar.

The bugger's would jump in thinking it was fermenting fruit.

jangel · #13 (**permalink**) 11-14-2009, 12:19 PM

It seems I have FINALLY had some success killing off my infestation of fungus gnats. Over the last while I have been over run with them. I pulled out all the stops and did whatever I could to kill them or I was going to close down my complete grow for a while to get these things GONE! This is what worked for me:

All of this was added to each GALLON of Reverse Osmosis water every watering.

2 tablespoons of Vectobac Vectobac PDF file

2 teaspoons SM-90 SM-90

2 teaspoons Neem Oil

As well I had ribbons of fly paper everywhere.

One thing I found out from observing these little buggers.

ANY open wet soil is an attractant. They also used the drainage holes of the pots. If you sit and watch any thing that is affecting your crop long enough, you can usually come to some conclusion on how to confound it. Let us hope we are wiser than some damn bugs. I had tried cinnamon. Every plant was covered with it. Yes, it works to repel a few of them, for an initial first few seen. BUT what I found is that over time, it gets wet, rots and has no affect. It also will change the ph of your soil. Due to the number of plants I had, at different stages, from flowering plants, to vegging clones, to seedlings and new clones with soft new roots, it did not work consistently enough for me. I also found that rooting clones in peat pellets attracted the gnats to them. I think that peat moss is of a sort of fiber that they like. It is consistently wet, in order for the clones to root. It is made of the roots and plant, all in one. I found it was a breeding ground. Out of 18 clones I had only 2 survive. Now I am using perlite to root clones, and they seem to be fine...(I just keep my fingers crossed!)

In my reading on these damn things I have read many suggestions to cover the soil with sand. I had no sand, and couldn't seem to find any here that was sharp. I also tried diatomaceous earth, but found once this got wet, it too was of little use. Now I have all of my plants top soil covered with perlite. About a half to an inch deep. This prevents the adults from being able to get to the soil to lay their eggs.

I am sure that the combination of all three things worked. The vectobac to kill the larvae, the neem oil as well, to repel them, and the sm-90 to build new roots and help the plant overcome the affects of the gnats. With the perlite on top, and fresh fly paper hung, I have caught in the last 2 days maybe 4 to 6 per room. If it was practical, I would also bury the pots in the perlite as well, to keep them from being able to get to the drainage holes of the plants. For my size of a grow though, it is not practical and I think they are pretty much gone anyway. I will continue with my treatment until such time I see absolutely none of them.

I had so many the fly paper was literally covered with them, from top to bottom. Very discouraging. Here in Canada we cannot get a number of things to fight these. Such as Gnatoral. And Mosquito Dunks. I believe the Vectobac is a similar product though. But this is only available at my hydro store. I have not seen it anywhere else.

nyk8 · #14 (**permalink**) 11-17-2009, 01:46 PM

thanks to all who have helped, but i do got to say that i used diatomaceous earth ( sorry can't spell) and that stuff was awesome. took care of the problem in no time.