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InvisibleOlgualion
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Fungus Gnats, nematodes (Steinernema spp) and hypoaspis
    #2542952 - 04/09/04 12:02 PM (12 years, 11 months ago)

Fungus gnats have recently begun to invade a friends grow area. I believe they began breeding in the pots of his yearling trees (mimosa scabrella). Now they have found their way into the casing of his first mush grow in a year.

After doing a good amount of research, I have found that, at least for the plants, they are generally no more than a nuisance pest. He is worried they may be more than just a nuisance mycologically speaking. I have come across a few ways to combat them, notably nematodes (Steinernema spp.) and predator mites (hypoaspis spp.).

Can anyone give any idea of how safe it would be to add either to casing soil?

Has anyone had an indoor infestation of fungus gnats and still had productive crops?

Any first hand information on treating a fungus gnat infestation would be greatly appreciated.

**EDIT** Sorry if this is the wrong forum. If so, please move it to the contam forum..


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Edited by Olgualion (04/09/04 12:47 PM)


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Anonymous

Re: Fungus Gnats, nematodes (teinernema spp) and hypoaspis [Re: Olgualion]
    #2542974 - 04/09/04 12:16 PM (12 years, 11 months ago)

Ok so gnats. will turn your mushroom to brown messes with lil magots crawling in em. One day there flying around. The next the gone a few weeks later you have lil magots. I drink lots of beer and found that some speacies love it just as much as I. Not the lil gnats but a a fly thats bigger then a fruit fly that eats mushrooms. A beer bottle qaurter of the way full in one week will be totaly full of flyes. I assume these flys could be a problem for you but I have never seen them on a cubensis tray. Only production blocks of oyster mushrooms. So give it a try and see what happens.


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Invisiblemycofile
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Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Olgualion]
    #2543198 - 04/09/04 02:00 PM (12 years, 11 months ago)

Quote:

Has anyone had an indoor infestation of fungus gnats and still had productive crops?



Yeah, maybe here and there, but I don't think it's worth it to try.  Maybe if you've just noticed a few flies, but not if it's truly infested.  Not unless you want all your future casings to be attacked, not to mention always having those fuckers buzzing around your head and such.

I suggest the trash can tek :frown:  Sorry, but better to cut losses than to imperil future projects IMO.

Fly strips, atractor poison hanging thingies, diatamcus (sp.?) earth etc are all useful in the very earliest stages, but if you have seen more than 10 flies, I'd toss it.  You can still get flushes from it outdoors if you want .


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InvisibleBi0TeK
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Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Olgualion]
    #2543494 - 04/09/04 02:58 PM (12 years, 11 months ago)

I've not used biological control before but from what I've read, the predatory mite (Hypoaspis miles) is used commonly in large scale mushroom production.

You might also like to experiment with Synacra pauperi which actually parasitizes the larval stage of fungus gnats. (Note: S. pauperi is not yet commercially available in the U.S. but is being used in Europe for fungus gnat control in mushroom houses.)


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Anonymous

Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Bi0TeK]
    #2543804 - 04/09/04 04:00 PM (12 years, 11 months ago)

Cool. I still stand by my beer technique for now. Dosnt get rid of em all but we have a bug zapper over a few beers. Keeps them off the mushrooms located to a small area. But then again I am not dealing with fungus gnats. I belive I am dealin with phorid flys.


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InvisibleJoshua
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Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Olgualion]
    #2543882 - 04/09/04 04:22 PM (12 years, 11 months ago)

Neem oil is an organic control method that interrupts the gnats life cycle and prevents it from continuing past the larval stage.

I eliminated my problem by removing the source, in your case the pots. As you probably can't do this, I do suggest preparing the oil according to the instructions. You can then mist the solution onto any infected soils to control the insect.

The insects will affect your fruiting.

Good luck!!!

Joshua


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Offlineobo
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Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Olgualion]
    #2544036 - 04/09/04 05:25 PM (12 years, 11 months ago)

here is somthing i just ran accross, have not had a chance to try it.

"We use pyrethrum for gnat control. It is effective in reducing the
gnat population and has the plus of being fatal to gnat larvae.
We used to be able to get a liquid concentrate of Pyrethrins, but
recently this has not been available except with the addition of fatty
salts (soaps) which is NOT acceptable. . .the fatty salts are NOT good
for mushrooms. So, now we buy Pyrethrum powder (powdered Chrysanthemum
Blossoms) and I make up an extract for spraying. A tablespoon of powder,
mixed with about an ounce of absolute isopropyl alcohol and stirred for a
few minutes, then diluted with about a quart of water, then strained
through a paper filter, makes an acceptably strong and effective
insecticide with no appreciable effect on mushroom fruiting nor taste.
There seems to be a complex organic solvent present in the ready made
pyrethrin sprays which extracts additional pyrethrin from the powder, so
sometimes I include an ounce of the "ready-made" Safer pyrethrin spray to
the above mix."


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Invisiblewinelover
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Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Joshua]
    #2545043 - 04/09/04 10:25 PM (12 years, 11 months ago)

What Joshua said and the neem powder is used in organic mushroom houses,
as well as in soil to protect cuttings  in horticuture. :loveeyes:


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Anonymous

Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Joshua]
    #2546967 - 04/10/04 08:30 PM (12 years, 11 months ago)

So will it work on larve in side the mushroom?


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InvisibleOlgualion
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Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Olgualion]
    #2548426 - 04/11/04 11:20 AM (12 years, 11 months ago)

Thanks for the ideas guys (gals?).

Infestation was a bit of an eggageration.  In fact, my bud hasn't noticed any bugs in the mushroom tray yet, but I forsee it.  The plants on the other hand are nearing that point.

I think he will go ahead with the nematodes and predator mites for his plants, and the neem oil sounds like it could be used as a preventative measure in his casing mix until the gnats are entirely eliminated.  I will also do some research on the pyrethum.

Being rather broke at this time, the war will not commence for at least a week or two.  I'll keep you updated.

Thanks for the helpful replies!  :smile:


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OfflineRogerRabbitM
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Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Olgualion]
    #2548613 - 04/11/04 12:41 PM (12 years, 11 months ago)

Get sticky mats, and set them up in your grow area. They're bright yellow, and attract both flies and gnats. Once they land on it, they can't get loose. They work great. I'm not talking about little pest strips, but 2' x 4' mats.


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Anonymous

Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: RogerRabbit]
    #2549405 - 04/11/04 10:24 PM (12 years, 11 months ago)

you would get them at like a hydro store probably right?


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Anonymous

Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: RogerRabbit]
    #2549406 - 04/11/04 10:24 PM (12 years, 11 months ago)

you would get them at like a hydro store probably right?


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Anonymous

Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: RogerRabbit]
    #2549407 - 04/11/04 10:24 PM (12 years, 11 months ago)

you would get them at like a hydro store probably right?


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OfflineRogerRabbitM
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Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: ]
    #2553689 - 04/13/04 10:23 AM (12 years, 11 months ago)

Quote:

AFungitobewith said:
you would get them at like a hydro store probably right?



http://www.fungi.com/tools/misc.html#DFP
You'll find the sticky mats at the bottom of the page.


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Offlinemycoguy
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Re: Fungus Gnats, nematodes (Steinernema spp) and hypoaspis [Re: Olgualion]
    #2557117 - 04/13/04 11:39 PM (12 years, 11 months ago)



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