I found this posting very helpful
http://figs4funforum.websitetoolbox.com/post/hydrogen-peroxide-4617842?highlight=hydrogen+peroxide

 You can have what seems like a great cutting, plenty of roots rocking right a long and then you notice it hasn't proceeded or all the leaves go limp and fall off.... you finally take a look and there they are nasty looking clearish black headed little creepy fig killers..

Thanks for the links. At this moment I don't have any hydrogen peroxide or any diatomaceous earth, but I like the 3% HP idea. I try to be at least 99.9% Organic with my fig trees and cuttings. I wander if dried basil herb from my kitchen spread around the cuttings would help with the gnats. I looked at my rooting cuttings today and noticed lots of dead gnats around the trays. Strange, I didn't spray or put anything new. I think it was my portable heater. I set the thermostat to 86 degrees. Anyway, I set it at the same temperature so lets see. I will post my results. Meanwhile I haven't ordered nematodes yet. Does anyone know how to store them or how long a time will they store alive?

Put an inch of gritty sand at the top of the pot/cups to keep them from laying eggs there, misquito dunks to kill what's there and lightly water from the bottem. They WILL kill your figs if you can't controll them. The nematods are the way to go but I think they can be costly, but then again so can some cuttings. Good luck, keep us posted.

One other good cure is "Knock-Out-Gnats" from Gardens Alive:

http://www.gardensalive.com/knock-out-gnats-granules/p/3440/

Acting ingredient: Bacillus thuringiensis (Bt/H-14)

The gnats we are talking about here are them nasty 'Fungus Gnats',
which almost always find their way into growing indoor/greenhouse plants.

With outside plants; the wind mostly just blows them adults away and
any infestation slowly dies away too.

Has anyone here tried cinnamon and/or chamomile tea? Looks like those get mentioned quite a bit on the 'net for controlling fungus gnats.

think sombody used somthing like that this last winter Robert, but if memory serves they ended up doing misquito dunks. i lost a few cuttings last winter myself the ones that made it were the ones i up potted to gal size pots as soon as there was enough roots. i then fed those from the bottem with root stimulator while netting the top of the soil off with dryer sheets. the ones i had in cups, well most of them didnt make it.

however George makes a point about outside plants and gnats. my green house plants havent had gnats but i keep the doors open so it dont get to hot and there is a constant breese. maybe putting a fan by the cuttings will help. not only by drying the soil making it less likly to be targeted but by blowing adults away from thier LZ. worth a shot i guess.

Thanks, Dave. I'm gonna try cheap and easy first since I have cinnamon and chamomile already in the house. The dryer sheets is a great idea.

Ditto to post#13.
Learned some years ago they are a real pita as i lost some sought after scionwood that were rooted.
No more indoor rooting period.

A (couple of) remark(s):

Controlling 'indoor' fungus gnats larvae (the real damage-makers) is different from controlling them (just-annoying) reproducing adults.

Best attack on the larvae is some form of a BT (including water soaked with mosquito-dunks).
This works by somehow making them loose appetite and they then starve to death...

Best attack on the adults is using some sticky tape (including cheap fly-paper - 4 for a buck from some supermarkets)
and/or using safe cheap insecticidal soap; very easy to do oneself - just google how-to for many recipe/hits.
Glue just makes them immobile, while soap-film stops them from absorbing O2 from the air and suffocate.

We are in mutual agreement here ...
Gnatrol is just another trade marked BT (Bacillus thuringiensis) larvicide.

Funny who you almost swallowed an annoying adult (protein?) fungus gnat.

I actually inhaled one through my nose while sleeping!!
I had noticed it lurking around my reading lamp and above my face earlier.
Yeah, b/c of its wings fluttering/tickling sensation, I did wake me up and
it ended up being squashed and soon blown out again...

LOL about the coffee. Nope the gnats don't mind a heated temperature room. The gnats that died must have all been old and died at the same time. A new crew just emerged out of the soil and back to gnat mayhem. I like the reviews of using "knock-out Gnats". Also just sprinkling granules onto the soil and not worrying about my product being dead (nematodes) is awesome.

A few drops of liquid soap in a gallon container used to water your plants kills the larvae in the soil. Also seems to destroy the eggs. My family has always used this method and it works without fail.

Hi,

I had serious gnat and larvae problem previously on a newly rooted Deanna.

Everytime I watered could see the wriggling larvae with their transparent body and black head.  There were probably attacking the new roots too.

Used diluted H2O2 2-3X to water, and let the soil/media dry well before each watering.  Resist temptation to overwater...

After that no more larvae nor gnats.  The plant is doing fine now and growing to a few feet tall.

So diluted H2O2 did not seen to affect the roots, only the larvae......could hear the sizzling sound as the H2O2 decomposed.

Wow. This is my first year and I could not believe how many gnats invaded the citrus and figs indoors. I took the advice on here and got a huge bag of sand at lowes for $3.50. Best money I have ever spent. No more gnats! Thanks for the great advice. FYI I did use an insecticidal soap which was only 5 bucks and killed on contact but was unable to completely remove them with that method.

We tried the hydrogen peroxide which helped, but regular treatments of gnatrol was what did it.  We are going to put our  rootings later this season and top with sand.

I saw  video, the person put gardening fabric on top of the soil and top it with sand. I thought it was a neat idea, but I cannot locate that video... perhaps that would help also. 

I just ordered this bti gnatcontrol off of ebay said its a larvicide that is organic. Good price as well less than 10 bucks for enough to mix 31 gal

I admit I am a newbie to figs but I've done work with other scion. I have never had a gnat problem so I am not even sure what y'all are talking about. I always dip my scion in 10% bleach solution and then let it dry on the scion before I refrigerate them for storage. I use sterile potting medium or green sphagnum moss. No damping-off or gnats. Is this too simplistic? I guess I'm not bringing too many plants into my house but instead into the garage.

Fungus gnats are basicly fruit flies. They lay eggs in moist soil and it the larva that eat the roots and kill plants. Lost more than 50 cuttings last winter. I almost gave up. But I can't give up. I sell fig trees on ebay and donate to charities with the money so I have to keep things going.

I was like you MG, with everything I had grown and all the plants I have in my house i never had a fungus gnat problem till  I started rooting figs... they are somewhat like fruit flies but are black and move in a jerky scurry when not flying.