Shop Orchid Care OrchidTalk Orchid Forum Weather Station Links Nursery

Welcome to OrchidTalk Orchid Forums


The Friendliest Orchid Community on the Internet!


  •  » Learn to Repot your Orchids
  •  » Learn Orchid Care Tips and Secrets
  •  » Find the perfect Orchid for your Growing Environment
  •  » Chat with Orchid Growing Professionals

OrchidTalk - "Bringing People Together to Grow Orchids Better!"


Let us help you grow your Orchids better; Join our community today.


YES! I want to register an account for free right now!


Register or Login now to remove this advertisement.

Page 1 of 2 12 LastLast
Results 1 to 10 of 14
Like Tree1Likes

Damn fungus gnats!

This is a discussion on Damn fungus gnats! within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; I was just giving my plants their daily inspection and found a tip nibbled off ...

Click here to increase the font size Click here to reduce the font size
  1. #1
    cakedaddy's Avatar
    cakedaddy is offline Senior Member
    Real Name
    jason
    My Grow Area
    Porch/Patio.
    Join Date
    Nov 2008
    Location
    Florida Panhandle
    Posts
    2,021

    Default Damn fungus gnats!

    I was just giving my plants their daily inspection and found a tip nibbled off a new stanhopea root. Did a bit of poking around and came across quite a few larvae...assuming fungus gnats as I saw them alot over the summer while the babies were outdoors. They have just been moved indoors over the last week or so and are under lights, so I would assume the warmth is great for them. I've read plenty on how to deal with them, but there are problems with the methods I saw. Firstly most of my plants in that area are bulbos, stans, etc...water hogs. Second, a conure lives in the room. Most of the info I found was pretty dated...anyone have any non-bird toxic methods to kill the larvae?
    Posted via Mobile Device

  2. #2
    opaline's Avatar
    opaline is offline Senior Member
    Real Name
    Matt
    My Grow Area
    Sunroom
    Favorite Orchid(s)
    Catasetinae
    Join Date
    Jul 2011
    Gender
    Male
    Location
    England, UK
    Posts
    830
    Member's Country Flag

    Default

    Give the plants a dry spell, no spraying or watering, if you can. i have fungus knats throughout the year off and on but i dont notice damage to roots by the grubs, but will look much closer anyhow, I was assuming that the diet is decomposing organic matter hence removing the element of moisture temporarily as this is essential to eggs and larvae and this dryness will obliterate the population.

  3. #3
    cakedaddy's Avatar
    cakedaddy is offline Senior Member
    Real Name
    jason
    My Grow Area
    Porch/Patio.
    Join Date
    Nov 2008
    Location
    Florida Panhandle
    Posts
    2,021

    Default

    The problem is that I cannot hold back water...I have terribly low humidity and I am growing some bulbos on treefern. They are doing amazingly well btw. But for them to do well, I have to soak them almost daily and mist twice a day. I think the biggest problem is with the stans...they are in mostly sphagnum. It's the only thing that will stay moist enough. The only plants I have under those lights are the water hogs...the catts and dends are upstairs in a south facing window. Hmmmm...I cant stand to dry them all out and those eggs stay via le thru drought anyway
    Posted via Mobile Device

  4. #4
    leafmite's Avatar
    leafmite is offline Senior Member
    Real Name
    Leaf Mite
    My Grow Area
    Under Lights
    Favorite Orchid(s)
    anything fragrant, miniatures
    Join Date
    Sep 2010
    Location
    Ohio
    Posts
    244
    Member's Country Flag

    Default

    I am trying a pitcher plant and butterwort but I think the ones I bought take a break catching bugs over the winter. I read there are some that don't so I plan to look into this. Sticky traps hung near the plants and Mosquito dunks added to the water before watering might also be effective. Good luck,
    Leafmite
    Posted via Mobile Device

  5. #5
    cdayinflorida's Avatar
    cdayinflorida is offline Senior Member
    Real Name
    Cathy
    My Grow Area
    Greenhouse
    Favorite Orchid(s)
    Vandaceous
    Join Date
    Aug 2011
    Gender
    Female
    Location
    Riverview, Florida
    Posts
    5,701
    Member's Country Flag

    Default

    I use granular systemic marathon on the plants inside under lights. Works really well. Just sprinkle it over the media.

  6. #6
    opaline's Avatar
    opaline is offline Senior Member
    Real Name
    Matt
    My Grow Area
    Sunroom
    Favorite Orchid(s)
    Catasetinae
    Join Date
    Jul 2011
    Gender
    Male
    Location
    England, UK
    Posts
    830
    Member's Country Flag

    Default

    Hi jason, i have stans and bulbos mounted on treefern,cork and aquarium filter sponge ( the latter being a cheap alternative to tree fern, but looks similar, but has to be customised to retain water). I know how sensitive stans become when dry at roots bringing on the yellowing and death of leaf so its a tricky one, mind you I cant grow 'water hogs' in sphag moss here as i get root rot. Macabre to see how our grow environments are so diverse when using similar methods.

    How big were the grubs/larvae? 1 cm? as vine weevil grubs/ larvae are extremely damaging to roots/ tubers/ bulbs....I dont use pesticides and very occassionally use miticide but somehow manage to keep the population down to a bare minimum and i spray daily sometimes twice daily with rainwater.

    As leafmite suggests, sticky taps/ cockroach traps and fruit peel (isolated from plants but very close). You can baste the orange/ banana with treacle/ syrup /honey. the odour of over ripe early decomp fruit will draw them in and stick/ die. Unfortunately if you have fruitfly over there this ones a no no aswell. An obstacle at every turn.

    have seen products for fungus knat that come in a soil drench to be repeated as a course like antibiotic so that the adults breed but never have babies and so 'apocalypse gnat'.

  7. #7
    cakedaddy's Avatar
    cakedaddy is offline Senior Member
    Real Name
    jason
    My Grow Area
    Porch/Patio.
    Join Date
    Nov 2008
    Location
    Florida Panhandle
    Posts
    2,021

    Default

    Thanks everyone for the alternatives! The one I saw was almost certainly a gnat larva-fit the bill perfectly and I do see a few fly here and there. I wish there were enough humidity here for me to grow my Stans in bark opaline! We are planning a move to Florida in the future...I'm sure the plants will be happier there and I am excited about the fact that I will be using the sphag as an amendment instead of the base to my media!
    Posted via Mobile Device

  8. #8
    Teena's Avatar
    Teena is offline Senior Member
    Real Name
    Martha
    My Grow Area
    Windowsill
    Favorite Orchid(s)
    can't choose
    Join Date
    May 2011
    Gender
    Female
    Location
    No. of Boston, MA USA
    Posts
    578
    Member's Country Flag

    Default

    There are some solutions suggested in this article: Fungus Gnats as Houseplant and Indoor Pests

    martha

  9. #9
    pavel's Avatar
    pavel is offline change is the only constant
    Favorite Orchid(s)
    whatever will bloom
    Join Date
    May 2005
    Location
    Michigan
    Posts
    8,643
    Member's Country Flag

    Default

    Immediate resolution will likely require a soil drench with a strong pesticide as well as an "aerial attack". If you can abide a slower approach then you have more options.

    Bacillus thuringiensis subsp. israelensis is found in "mosquito dunks" found at just about any BBS.

    Pitcher plants will be ineffective against fungus gnats. Droseras (sundews), & Pinguiculas (butterworts) generally wreck havoc upon adult fungus gnats. Terrestrial Utricularias (bladderworts) are useless against adult gnats but can do a great deal of damage to the larva population. As you are keeping the Stan sphag moist, such plants as these could be planted in the pot with the Stan. However, cps do not like fertilizer. With this in mind, if you should decide to use cps, you would probably have to settle for having them close by and not actually in the Stan's media.

  10. #10
    mauraec's Avatar
    mauraec is offline Senior Member
    Real Name
    Maura Caffrey
    My Grow Area
    Outside 24/7
    Favorite Orchid(s)
    Paphiopedilum lowii
    Join Date
    May 2011
    Gender
    Female
    Location
    Englewood, FL
    Posts
    3,092
    Member's Country Flag

    Default

    Can you remove them from the bird-room long enough to blast them with systemic insecticide, then flush them out with pure water for a few days until the toxins are gone?

Page 1 of 2 12 LastLast

Similar Threads

  1. Neem oil? Does it work for gnats?!?!!
    By jwhawaii in forum New Growers: Ask the Senior Members
    Replies: 8
    Last Post: May 12th, 2014, 06:02 PM
  2. ugh...I have gnats
    By GrumpyBear in forum Orchid Ailments / The Compost Pile
    Replies: 11
    Last Post: January 6th, 2009, 11:51 AM
  3. Gnats and Medium
    By salvador1970 in forum Orchid Ailments / The Compost Pile
    Replies: 7
    Last Post: March 12th, 2008, 04:30 PM
  4. Damn Mosquitoes
    By LJA in forum The Outback Terrace Bar
    Replies: 3
    Last Post: August 19th, 2005, 02:46 AM
  5. Darned, Flipping Gnats!
    By Heather in forum General Orchid Culture
    Replies: 37
    Last Post: June 20th, 2004, 02:53 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OrchidTalk --An Orchid Growers Discussion Forum brought to you by River Valley Orchidworks. A World Community where orchid beginners and experts talk about orchids and share tips on their care, cultivation, and propagation.