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artcore
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Good post!You need Bti (Bacillus thiringiensis israelensis)
The product you have stated is not for use on diptera (fly order) and will not work on fungus gnats. The reason it only gives foliar rates is because it is used for I believe caterpillars.
You've got to get to home depot or similar for mosquito dunks. Or order the more specialized products (which I don't think are any better, maybe spore count?) specifically marketed for fungus gnats.
Or you could try sprinkling DE (diatomacious earth) on the tops of your pots.
I've heard a layer of sand also works on top.
I usually don't have problems once I crumble up some (about the size of a gel cap advil) mosquito dunks onto my pots.
Others I have heard just can't get rid of em
Good luck
@artcore
Bt and Bti are both a biological pesticide. Biological pesticides are very pest specific, so no regular Bt will not do any damage to fungus gnats.
can you be more specific on the mesquito dunks please? i have some of these but i have never used them.i thought about smashing up one and using like a 1/3 of it in a gallon of water and doing a soil drench.but it sounds like you are just using i tiny piece of it the size of a pill and putting it on top of your soil?thanksYou need Bti (Bacillus thiringiensis israelensis)
The product you have stated is not for use on diptera (fly order) and will not work on fungus gnats. The reason it only gives foliar rates is because it is used for I believe caterpillars.
You've got to get to home depot or similar for mosquito dunks. Or order the more specialized products (which I don't think are any better, maybe spore count?) specifically marketed for fungus gnats.
Or you could try sprinkling DE (diatomacious earth) on the tops of your pots.
I've heard a layer of sand also works on top.
I usually don't have problems once I crumble up some (about the size of a gel cap advil) mosquito dunks onto my pots.
Others I have heard just can't get rid of em
Good luck
the only thing i can think of is the gnats in larva or pupa stage must be very close to a caterpillar...i use bt for caterpillars. i can't explain because i don't know why it works, but it does.It's not that the original formulation of Bt won't kill gnats, it is that it CAN'T kill gnats. As it's mode of action is specific against caterpillars. My understanding is lepidoptera and coleoptera. Where Bti (subspecies israelensis) goes for 'lower tiered' diptera.
@brimck325 If your Bt killed your gnats, you had Bti. If it wasn't Bti, something else coincidentally happened after your application.
"Bt action is very specific. Different strains of Bt are specific to different receptors in insect gut wall. Bt toxicity depends on recognizing receptors, damage to the gut by the toxin occurs upon binding to a receptor. Each insect species possesses different types of receptors that will match only certain toxin proteins, like a lock to a key.
It is because of this that farmers have to be careful to match the target pest species with a particular Bt toxin protein which is specific for that insect. This also helps the benifical insects because they will usually not be harmed by that particular strain of Bt."
Source: http://www.bt.ucsd.edu/how_bt_work.html
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