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tabbyjane

fungus gnats!

11 years ago

So, I have learned my lesson with Miracle Gro potting mix. My containers are full of fungus gnats! I know over watering is usually the culprit, but I have taken care not to do so. I can't help the rain, though :/

I noticed a few of them immediately after planting with MG. That tells me the bags were already infested before I even opened them. I cannot replace my mix this year. My husband already thinks spending $10 per bag, a total of $80, was insane. I thought having my plants in direct sunlight for about 8 hours a day, along with letting the mix dry out a bit would keep them under control. Yeah right! These little devils are strong. None of my plants seem to be bothered by them except for my Basil (still pretty small), I think their little roots are being devoured. So, last night I decided to order some mosquito granules, like the dunks but in pellet form. Until my order comes in I'd like to try something else. I've read that orange oil can kill them. Has anyone tried this? Could it hurt my plants? I have a bottle of Garden Safe Fungicide3, but I had an anaphylactic reaction to it and ended up in the hospital a few days ago. So neem oil is 100% out of the question.

Ugh. Miracle Gro.

Comments (7)

  • 11 years ago

    I don't have a lot of experience, as I just started having this problem, but I tried the peroxide/water solution and it seems to be helping. I used 3% hydrogen peroxide in 3 or 4 parts water and just watered my plant with that when it was time to water. I've only done one watering so far, but I will do another round next week when my plants need to be watered.

    Tabatha Thompson thanked Pistachios (Zone 7)
  • 11 years ago

    Try lightening up on the watering can hand. Gnats love a continually moist soil, which puts them in a orgiastic frenzy resulting in offspring too numerous to count. If your plants are established, avoid watering until a sharpened wooden dowel (sharpen in a pencil sharpener)stuck VERY deep into the pot comes out clean/dry. That should solve your gnat problem, even if I like Joe's idea much more.


    Next year, maybe you can put together your own mix of pine bark, peat, perlite, and lime. It will please both you and the husband because it will almost certainly relegate the gnats to an issue unique to 2015 and can be made for about half the price of a commercially prepared soil.


    Al

    Tabatha Thompson thanked tapla (mid-Michigan, USDA z5b-6a)
  • 11 years ago

    Thank you all! I've had a pretty hectic week, so I just couldn't find time to respond. I do appreciate all of the info you guys have given me (:

    I used the mosquito granules and have been keeping a close eye on my watering habits. It just keeps raining here though! I'm hoping things will dry out soon.

    As for using a better mix next year, that's not even up for debate with me lol. I will NEVER use MG mix again. Honesty, I started this whole thing out with full intentions of building the 5-1-1 or gritty mix. I just couldn't find all of the ingredients. Better luck next year *fingers crossed*...... Al, I was talking to my husband the other night about how frustrated I am with all of this container nonsense, when he said "This Al guy should bag this stuff and sell it". I agree! You'd be rolling in the green (literally and figuratively) lol.

  • 11 years ago

    I had good results with Gnatrol for indoor potted plants with a heavy fungus gnat infestation. Yellow sticky fly pads helped too, but only controlled the gnat population and did not eliminate it. Look into beneficial nematodes as a possible solution.

    Tabatha Thompson thanked Robert
  • 11 years ago
    last modified: 11 years ago

    I've been fighting the fungus gnats in my houseplants for a year. I water them from the bottom and I let them get so dry between waterings they're almost dead; tried fungicides and other things. I have bought literally cases of hydrogen peroxide (H2O2) and increased the concentration to 1 part H2O2 to 2 parts water (learned it definitely doesn't hurt the plants).

    Finally bought the Mosquito Bits and there was a difference within a few days! The directions say to sprinkle them over the soil until it's covered and then water them in - I think for three weeks. Then it suggests keeping Mosquito Dunks in your watering can to water with from then on. It's been about a month and I think we're cured!

    These products are Bacillus thuringiensis v. israelensis. They're biological, or a bio-pesticide. I don't know if they're specifically in the nematode category because I think they're a single cell but they are a beneficial biological something.....

    You're on the right track and good luck!

    Kay

    Tabatha Thompson thanked kay21_utahzone5b
  • 11 years ago

    I've noticed fungus gnats crawling out from under the bottom of my plants when I've attempted to water from the bottom. If the water can get in, so can the gnats it seems! The nematodes finally did the trick. I'll have to take a look at Mosquito Bits, that sounds interesting.


    Tabatha Thompson thanked Robert