DarnVarmints forum: Fungus gnats

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ImageDonnaMack
Feb 14, 2010 9:13 AM CST
Name: Donna Mack
Elgin, IL
This seems to be the time of year when many people experience the joys of fungus gnats on their indoor plants. If you grow plants indoor that attract fungus gnats and their larvae, I have found several ways to deal with, from the completely organic to the chemical.

I take my Tidal Wave petunias indoors and put them in the windows. Fungus gnats are attracted to them, land on them, stick to the leaves and die. I have a double cascade petunia in the basement I use the same way. You don't need the flowers. The leaves are sticky. Just rinse them off periodically and then put them back to work. This method alone reduces them by 80%.

Insecticidal soap works too, which you can duplicate with dishwashing detergent and preferably filtered water, but it only kills the ones you hit. So as long as there are two, you will get more, but it will take them a while to build up.

The chemical solution is acephate, which zaps chewing insects (but not pollinators) and works on thrips, fungus gnats, spider mites and aphids, in my experince. It is short acting. You can find it in Orthene or Ortho Systemic Insect Killer.
[Last edited Aug 15, 2011 3:20 AM CST]
Quote | Post #37630 (1)
Imagestormyla
Feb 14, 2010 1:17 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
That's great advice, Donna. For larger plants with thick leaves like Clivia & Schefflera, some folks use baby diaper wipes with alcohol to wipe the leaves. This will kill the flying and crawling ones, but not get the eggs which are in the soil.

Another gardener told me about Merit 75 WP. It can be used with water in a spray bottle and also as a soil drench to kill the eggs. It is expensive, but extremely effective. I found the best price for it on Ebay here:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=120530944...
Surroundx
Sep 3, 2010 7:27 PM CST
Name: Branden
Western Australia
I am currently in my third year of an apprenticeship, and one of our projects is to count fungus gnat numbers in propogation igloos. We use a yellow sticky trap, which is VERY effective. Fungus gnats and some other pests are attracted to yellow things, so anything yellow and sticky, such as marine grease in a jar lid, catches lots of them. Hope this helps.
http://www.cubits.org/TheExtinctionCubit a database of species which have become extinct within the last 100,000 years.
Imagestormyla
Sep 3, 2010 7:52 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Yes, Surroundx, it very much does. Thank you for the great suggestion.

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