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moogannn

Fungus Gnats!

9 years ago

I have seen several fungus gnats flying around the room where I keep my plants. Not a whole lot, but enough to be annoying. This morning, I found a dead adult gnat on the soil of my Echeveria. I want to get ahead of the problem before it becomes more established.

My question is, what is the best treatment I can use that wont hurt newly-forming roots or interrupt leaf formation of my propagations? Will it be harmful to treat all of my plants since they are on the same windowsill and I'm not sure which plants are infected?

I have heard of treatments using cinnamon, hydrogen peroxide, and rubbing alcohol. Does anyone have experience with using any of these?


Other information that might be helpful:

  • My plants are potted in Miracle Gro Cactus, Palm, and Citrus Potting Mix (I know it isn't the best, but my plants seem to be healthy and I'm a grad student so money is a bit tight)
  • I water when the soil is completely dry, usually once a week (I have a/c so the air is relatively dry)
  • My other plants include a rooting christmas cactus cutting, a Sedeveria ("Jet Beads") plantlet, and an adult Sedum clavatum

Comments (8)

  • 9 years ago
    last modified: 9 years ago

    Try scrunched up cellotape, place in and around the plants, or bands of it around the pots themselves, sticky side out of course! The gnats will crawl on it and get stuck and it's a possible cheap alternative to buying the yellow sticky card traps we use here in the U.K. Just a thought that might help.

  • 9 years ago

    Buy a bottle of BTi from the garden center and treat as per the label with your water. This will work much better than peroxide or cinnamon or other weird things. =)

    It kills all the larvae that are living in the soil. And the yellow sticky tape or a vacuum can take care of the flying ones.

    Megan (10a) thanked ewwmayo
  • 9 years ago

    I have a few gnats flying around my room but I'm changing all my soil at the moment.. Do they only fly around rotting/bad/wet soil?

    Megan (10a) thanked succulentss
  • 9 years ago

    My Anacampseros rufescens (which lives outside) has been looking a bit limp lately, and some of the leaves are wrinkled even though I just watered it. I checked the soil and I noticed that the water only affected the outer parts of the soil near the pot and most of the soil around the plant was bone dry.

    I'm considering spending the money to get better soil. Would switching to Bonsai Jack's Succulent Soil help with water distribution and pest control?

  • 9 years ago
    last modified: 9 years ago

    @succulentss The flying bugs are distributed throughout the room. This is the first time that I've found one directly on any soil, which was potted less than a month ago, and was not wet at all at the time. There aren't very many at the moment though, so if eggs were laid they haven't hatched yet

  • 9 years ago

    The hard soil around the rootball = almost sure that it is peat that became hydrophobic. It is literally repelling the water, and plants roots do not get any. Should be taken off roots - it may be quite difficult. When dry like that, it is difficult to re-wet. Try warm water, it may help.

    I can't judge BJ Succulent soil since I never used it. It could be easier to get perlite and some grit and mix them to get good drainage...

    FG will fly around, but lay eggs in the soil. They are small and maybe you just do not notice them unless they are buzzing around. They are very annoying, like to fly right in your face...If you see 1, there will soon be many more. Adult female lays few hundred eggs in her life time that is very short (just days). Eggs hatch faster in warmer conditions.

  • 9 years ago

    Maybe when I repot my succulents out of the mix it came in it will be better. Since repotting some on Sunday I've seen less and less gnats. They seem to like my grow lights though. But if they get too close they die.

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