Gnat Problem!!! Use BT or Nematodes?

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GreenTikiFire
Posts: 4
Joined: Tue Jan 22, 2019 11:12 am
Location: Minneapolis

Gnat Problem!!! Use BT or Nematodes?

Post: # 55836Post GreenTikiFire
Mon Feb 11, 2019 1:22 pm

Hey All,


There is a HORRIBLE fungus gnat problem in my Paludarium. At first I figured... 'what the hell, who cares'. Then all of my germinating seedlings started dieing. Apparently fungus gnat larvae eat the root ends of new plants. I need to kill these guys.


Does anyone have any experience with the following? Specifically if these would kill other beneficial organisms (spring tails, ants, mantis, etc...). And how long will they continue to kill them if they do.

Bacillus thuringiensis (Bt) –
is a naturally-occuring bacteria that kills many types of worms, caterpillars, larvae and insects.

Beneficial Nematodes –
There is a type of nematode, Steinernema feltiae, that can be used to drench the soil each time you water. These tiny worm-like creatures will enter the larvae of soil pests like the fungus gnat and release a bacterium which is lethal to it.


Teaser photo right after built:
Image

PTasker15
Posts: 290
Joined: Thu Jul 13, 2017 9:41 am
Location: Crosby,TX

Re: Gnat Problem!!! Use BT or Nematodes?

Post: # 55862Post PTasker15
Wed Feb 13, 2019 3:23 pm

Nemotoad.Good Luck :D :)
My current ants
Pogonomyrmex Occdentalis
Myrmecositis Mexicanus
Formica Subsercea
Pheidole Moerens
Pheidole Obscuriothorax
Pheidole Bicarinata
Tetramourium Bicarinatum
Temnothorax Lonvcieps
Camponotua Castanus
Solenopsis Richteri,invicta,xyloni,Molesta.

JoeHostile1
Posts: 223
Joined: Wed Aug 15, 2018 6:51 am
Location: Canada
Contact:

Re: Gnat Problem!!! Use BT or Nematodes?

Post: # 55882Post JoeHostile1
Thu Feb 14, 2019 7:35 am

I have a lot of house plants. And this gnat problem is from overwatering soil. These things breed in saturated soil. I tried those nematodes, I didn’t really notice those helping. But if you let the soil dry up the gnats will stop breeding in the soil.
Keeping:
Tetramorium immigrans * Lasius Neoniger * Lasius Claviger * Messor Aciculatus * Myrmica Rubra * Camponotus Novaeboracensis * Camponotus Turkastanus * Pheidole Pallidula

https://www.youtube.com/channel/UCSfFtn6RegZ3F1NdS1g08NA

Nylanderiavividula
Posts: 18
Joined: Tue Feb 12, 2019 7:33 pm
Location: Thomson, Ga.

Re: Gnat Problem!!! Use BT or Nematodes?

Post: # 55902Post Nylanderiavividula
Fri Feb 15, 2019 8:20 am

I’m with Joe and his IPM approach. However, it would be nice to have a picture of the offending insects. Many people mistake phorid fly species for fungus gnats and vice versa. Your plant seedlings could be dying from damping off (overwatering), in which case decreasing water amounts would help solve the plant-death issue but not the fly issue if they are phorid flies. In either case, cut back the water amount. I like your YouTube videos, by the way, Joe.

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