Return to the Plant Propagation Forum | Post a Follow-Up

 o
natural fungal gnat removal

Posted by birdboyhg PA 6b (birdboyhg@aol.com) on
Mon, Dec 17, 07 at 23:50

Hi. I have a big problem with fungal gnats. I was re-planting rambutan and mango seedlings into larger pots and noticed the larva eating the roots and remainder of the seed. I am also trying to root some cuttings from my nepenthes. They, too, are being infected and eaten. I assume the maggots are causing the rot. Anyway, I am looking for natural ways to get rid of the gnats and also for natural fungicides. I know garlic is a good anti fungal, but will juice burn leaves? I tried removing the magots with potato and it worked, but there are just too many. Does anyone have any ideas?


Follow-Up Postings:

 o
RE: natural fungal gnat removal

There is a natural BT listed for Gnats, and you are right in assuming the larvae are eating the roots. I think it is named Gnatrol and should be easy to find. Al


 o
RE: natural fungal gnat removal

I know gnats thrive on a wet surface, so try spreading some vermiculite over the pots. it's decorative and it works for me (I have a thin layer of vermiculite over all my pots and haven't seen a gnat so far for the past few montsh)


 o
RE: natural fungal gnat removal

  • Posted by morz8 Z8 Wa coast (My Page) on
    Wed, Dec 19, 07 at 21:46

It's tough when you need a moist medium, the gnats are attracted to moisture.

The BT that will work for you is BTi - bacillus thuringiensis subspecies israelensis, different than the biological control available for caterpillars.

Available in liquid form as Gnatrol and Knock Out Gnats, or you can make your own from mosquito dunks. Float a dunk in a container of water overnight, use the water to water your pots for at least three consecutive waterings, timed as you need to keep adequate moisture for your plants. Save the dunk to re-use, intermittent wetting and drying doesn't alter the effectiveness.

I mention the dunk because liquid products aren't available locally to me here - although I do keep Knock Out Gnats on hand now. The liquid form BTi gives me the option of mixing to the strength I want - the dunks will work in a pinch.


 o
its natural but strong - tobacco

I have tried a tobacco spray to kill bugs. It works great & I have read that it is really effective as a soil drench.
I think I like morz's use of the mosquito dunks better though. I wonder if I could spray that for aphids & such?


 o
RE: natural fungal gnat removal

  • Posted by morz8 Z8 Wa coast (My Page) on
    Sun, Dec 23, 07 at 20:41

Kate, I wish it did work as well for other critters as it does mosquito larvae and gnats :)

Bti is a naturally occurring soil bacterium.

It is specific to mosquitoes/gnats, blackflies and midges and is essentially non toxic to other insects, birds, humans, mammals


 o
RE: natural fungal gnat removal

I switched to bottom watering and ended my fungus gnat problem. I let the soil surface stay dry. I grow in deeper trays than most people and I either sink a small plastic pot down into the media and pour water into the pot or I set the tray into another tray and only water the lower tray. I've seen people use various fine powders sprinkled on the surface to keep it dry with some success also.


 o
RE: natural fungal gnat removal

I use crumbled up mosquito dunks and just sprinkle it in the pots,and those yellow sticky traps the traps are only necessary because i wait too long to begin treatment.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Plant Propagation Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here