(I used to wonder if witting guinea pigs would put up with it, but my experience is when you try to explain it to folks, many seem to like the unwitting part; There's the hurdle to jump... )
Jess, sand is the old greenhouse trick for this issue but it is not foolproof, and the slimemold that FGs live with is a most ancient life form for a reason; it is PERSISTANT. Try the cinnamon as well...
Brenda Groth wrote:
it wasn't an overwatering problem, it was bad potting soil..the last two bags of potting soil i bought had fungus gnats IN IT when i opened it..the little fruit fly like pests flew out and all over my house and laid eggs in my plants..i was sick.
NM Grower wrote:
since their life cycle is 4-5 weeks total, maybe you can buy your potting soil 6 weeks in advance, open it outdoors, and let it dry down completely before you bring it inside.
Scott Reil wrote:
We have had no reports of ill effect to plants and we have been doling this cure out for a while to all sorts of plant owners. We've found just a dusting to be an effective curative to both the algal and insect symbiots.
While cinnamon is technically a volatile oil, you will not need anywhere near a plant lethal dosing to be effective...
If the cinnamon method doesn't pan out, 4 oz of hydrogen peroxide to 1 gallon of water does the trick. Mix up a batch & use it every time you water- it won't harm the plants.
I also grind up those skeeter dunks (which has the right kind of Bt) and throw about a tablespoon in a gallon of water & use that if the infestation is mild. The bits will stick to the sides, but that's ok- if it dries out, fresh water will reactivate the Bt. I don't bother cleaning out the gallon containers, I just add more periodically & give it a good shake.
I just got over a tremendous infestation and had to bump up the H2O2 to 6 oz/gallon. From "play sand" that I was storing beets in. Unbelievable amounts of fungus gnats. Totally gross. But after dumping the crocks & treating the plants for a few weeks, they're all gone now.
Scott Reil wrote:
One of my moderators just logged in and told me that here terrible infestation, that just spinkling was heading back some, but not completely killing off, has been corralled by a cinnamon/chamomile tea she made (chamomile is a low grade antifungal). She just put cinnamon sticks and tea bags in a jug, kept refilling and changing out the herbs and spices as they seemed to lose efficacy, and watered the soil (not the plants). She is fungus gnat free and swearing by this method...
Another sure fire method is nematodes (Steinernema feltiae being the most effective and best for indoor use on FG's). Predators are always a green fix, and a good link in the poop loop.