Fungas gnats

I'm going to look for them tomorrow. They must be somewhere. Otherwise I'll try the potato trick in the meantime. I find the larvae very resilient compared to the flying adults.

Gnatrol on ebay...

http://www.ebay.com/itm/GNATROL-WDG...061?pt=LH_DefaultDomain_0&hash=item3a71f212a5

Yea i have a small indoor grow so moth balls are out for me. I did buy the gnatrol on ebay for cheap just making sure it was not going to kill my plants before i used it.

I had it on UK only - duh

bauty67 said:

Yea i have a small indoor grow so moth balls are out for me. I did buy the gnatrol on ebay for cheap just making sure it was not going to kill my plants before i used it.

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No use the gnatrol its fine its made out of the same shit that those mosquito dunks are made out off.. The potato slice thing will work just depends on how big your infestation is. It's the larvae the gnats drop thats hard to get rid of if they are already burrowed deep then you will have to do some sort of flush... If you dont have a heavy/sever infestation then the potato slices should work...

or this one is cheaper. http://www.ebay.com/itm/GNATROL-Bac...ultDomain_0&hash=item3f181ef7ba#ht_799wt_1265

The seller was really cool.

chrishydro said:

use nothing follow this and they will be gone in three days. First go get yellow sticky paper at the nursery put it up all over the bases with the little sticks. Than this is the important part. Go get some potatoes from the grocery store cut up little two to three inch strips or squares, of course peel the thing first. Put a couple in each plant bed, pot, hydro container whatever. Switch those out every few hours during light time and give them new ones at bed time. The gnats love the potatoes so they lay their larve on there instead of the soil or whatever medium you are using. The yellow sticky stuff will kill the adults and in less than three days they will be gone along with the larve. Check out the potatoe pieces with your scope you will be amazed.

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In my Organic Gardening class in college a few terms ago, we talked about various plant diseases that are communicable across species and genus lines. the potatoes in the grocery store are absolutely full of disease! check out this link: http://en.wikipedia.org/wiki/List_of_potato_diseases. the various forms of Mosaic virus are the worst. most tobacco, potatoes, tomatoes and other staple crops regularly have these diseases. they have no effect on people that touch or consume them, but we can sometimes act as vectors that allow these diseases to enter our gardens.

for example, in Holland, Tobacco Mosaic Virus has (according to a post by "Annom" in this thread: http://www.growery.org/forums/showflat.php/Number/190149, about 1/3 the way down - he posts pics too) become common in indoor cannabis gardens. if you smoke tobacco near your girls, or do not wash your hands after a cig, you are running strong chances of passing it to your plants. the virus can be passed via contact with infected roots, or plant juices. always sterilize your cloning blade as you change plants. clones taken from an infected mother will grow up infected and will pass it on anytime that a vector is present in the garden (winged aphids, for example).

i'm all for the cheap, organic approach to pest management in the garden, but i would really advise against using a store bought veg on my soil like that. on the other hand, if you sprouted your own potatoes from seed, and then years later were using your own potatoes in that manner, that would be safer in terms of disease transmission.


i use Gnatrol at the rate of 1.25g of the Water Dispersing Granules per gallon of water as a top drench and bottom dip. that with yellow stickies crushes the gnats in about 3 days. i use Gnatrol because it's fine with the other EM that i run in my soil mix. otherwise a few flushes with H2O2 usually does the trick.

I can hardly see any flying but when I check under the leaves then there are always larvae near the bottom. I could water with Neem too but I don't think it'd be enough.

Does anyone know the active ingredient in this Gnatrol ?

lahadaextranjera said:

I can hardly see any flying but when I check under the leaves then there are always larvae near the bottom. I could water with Neem too but I don't think it'd be enough.

Does anyone know the active ingredient in this Gnatrol ?

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What happening is you have a pretty good infestation going on.. The juvenile gnats cant fly so they are crawling up the trunk/stalk of your cannabis plant and dropping larvae on your leaves. WHat I do is I always buy a extra pack of yellow sticky pads and I smother the trunk with the sticky stuff on the sticky pads, after a watering you will see the gnats start to crawl up the trunk of your plant but then it's game over they get stuck and die and cant reproduce..You can even buy the sticky stuff in a bottle and paint it on with a paint brush.

ACTIVE INGREDIENT: Bacillus thuringiensis,

Last week one went up my nose so I might have to agree. The yellow strips here come on rolls with a cable tie as they are meant to be hung up. These will be a good monitor (the old ones are covered in them). I could try to wipe the yellow strip around each trunk (35 +). Summer always present problems but I've had them for a while now.

Dont think i have them real bad yet so i used the yellow sticky cards and going with the gnatrol and i hope this takes care of it.

I'm with you bauty67, I've been using the sticky cards and getting a lot of the little bastards, but I want them to quit 'fuckin' in my soil. Can't wait to try it.

bauty67 said:

Dont think i have them real bad yet so i used the yellow sticky cards and going with the gnatrol and i hope this takes care of it.

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If you have even one adult you have larve which means you have 20 more tomorrow.

I've put 3 yellow strips in the main room and one caught 6 knats in a couple of hours. Going to do the potato skins tonight.

lahadaextranjera said:

Last week one went up my nose so I might have to agree. The yellow strips here come on rolls with a cable tie as they are meant to be hung up. These will be a good monitor (the old ones are covered in them). I could try to wipe the yellow strip around each trunk (35 +). Summer always present problems but I've had them for a while now.

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This is what I do .. I wipe the trunks.. The juveniles cant fly so they crawl up the trunks then when they get wings they start flying and dropping larvae. I also spray a couple of sprays of Fox Farms Dont Bug Me

BeaverHuntr said:

This is what I do .. I wipe the trunks.. The juveniles cant fly so they crawl up the trunks then when they get wings they start flying and dropping larvae. I also spray a couple of sprays of Fox Farms Dont Bug Me

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I would love to get hold of the paste that I could just brush straight on. The yellow strips are 60 cms long on a roll and I have a difficult enough time unrolling them to hang them up. If I tried to cut them up it'd be a joke, I have to scrub my hands after handling as they are so sticky. If I try to wipe the trunks on 5 Litre pots Im worried I'll have lots of accidents get them stuck to the leaves.

Can't I make elastic bands of cotton or ribbon or something to wrap around the trunk, soaked in ...??

lahadaextranjera said:

I would love to get hold of the paste that I could just brush straight on. The yellow strips are 60 cms long on a roll and I have a difficult enough time unrolling them to hang them up. If I tried to cut them up it'd be a joke, I have to scrub my hands after handling as they are so sticky. If I try to wipe the trunks on 5 Litre pots Im worried I'll have lots of accidents get them stuck to the leaves.

Can't I make elastic bands of cotton or ribbon or something to wrap around the trunk, soaked in ...??

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Yeah you can do whatever you want the trick is to prevent them from crawling up the trunks so let your imagination run wild. I always tell growers " what worked for that person may not work for you" so get creative. Yeah get some latex gloves dont worry about the sticky stuff geting on your leaves happens to me every grow it wont harm the plants.

You can also remove the sticky from the leaves with a little vegtable oil.

BeaverHuntr said:

Yeah you can do whatever you want the trick is to prevent them from crawling up the trunks so let your imagination run wild. I always tell growers " what worked for that person may not work for you" so get creative. Yeah get some latex gloves dont worry about the sticky stuff geting on your leaves happens to me every grow it wont harm the plants.

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It might harm me !! These sticky strips are so sticky I could wax my legs with them. Minus the insects of course !! If they touch the leaves they will rip the plant. I have to tie my hair back. Once, one hit me in the face and it nearly took my eye-brows off !!! I sound a bit clumsy now but seriously, they're dangerous. Maybe cut them into strips and wrap them around the trunks.

Im going up to see my girls in a couple of hrs and it will be interesting to see how many have been caught since. I will remove the potato skins carefully but am reluctant to use the microscope x60-x100 as I once saw the eyes of a spider mite and it was gross. I will just assume there are eggs on there.

Looking for Mothballs today as I think this is a great idea.


I can't believe how out of control they got. I have to check my tea as I drink it. "waitor, there's a fly in my ...." Sometimes they spring out of nowhere in the bathroom so I have to bleach the plug holes too.

I had spider mites once and that was so easy by comparison. (I love Neem).

I run a perpetual harvest and have my own clones so it's hard to have a full clear out. Definitely don't want to start from seed again.

lahadaextranjera said:

It might harm me !! These sticky strips are so sticky I could wax my legs with them. Minus the insects of course !! If they touch the leaves they will rip the plant. I have to tie my hair back. Once, one hit me in the face and it nearly took my eye-brows off !!! I sound a bit clumsy now but seriously, they're dangerous. Maybe cut them into strips and wrap them around the trunks.

Im going up to see my girls in a couple of hrs and it will be interesting to see how many have been caught since. I will remove the potato skins carefully but am reluctant to use the microscope x60-x100 as I once saw the eyes of a spider mite and it was gross. I will just assume there are eggs on there.

Looking for Mothballs today as I think this is a great idea.


I can't believe how out of control they got. I have to check my tea as I drink it. "waitor, there's a fly in my ...." Sometimes they spring out of nowhere in the bathroom so I have to bleach the plug holes too.

I had spider mites once and that was so easy by comparison. (I love Neem).

I run a perpetual harvest and have my own clones so it's hard to have a full clear out. Definitely don't want to start from seed again.

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Chances are they are coming up your pipes from somewhere.. Gnats love to live in wet places so they are likely coming from your sink or drains in the bathroom. Or they just could have came from clones.