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Old January 14, 2017   #1
Dutch's Avatar
Join Date: Jan 2011
Location: S.E. Wisconsin Zone 5b
Posts: 1,630
Default The Two Most Common Types of BT (BTk and BTi) Used in Gardening

BTk (k as in katerpillar) Bacillus Thuringiensis var. kurstaki
Used on the following;
Cabbage worm and cabbage looper
Tomato and tobacco hornworm
European corn borer
Alfalfa caterpillar and alfalfa webworm
Achemon sphinx
Tent caterpillar
Fall webworm
Red-humped caterpillar
Spiny elm caterpillar
Western spruce budworm
Pine budworm
Pine butterfly
Gypsy moth

Some common brand names of products containing BTk below;
Bonide Bacillus Thuringiensis
Bonide Thuringiegsis (BT) Concentrate
Ferti-lome Dipel Dust
Hi Yield Thuricide Concentrate
Safer Brand Bt Worm & Caterpillar Killer
Safer Garden Dust w/Bt

BTi (i as in insect) Bacillus Thuringiensis var. israeliensis
Used on the following;
Fungus gnats
Black flies

Some common brand names of products containing BTi below;
Bonide Mosquito Beater WSP
Gardens Alive Knock Out Gnats Granules (fungus gnat larvae control)
Gnatrol (fungus gnat larvae control)
Summit Mosquito Bits
Summit Mosquito Dunks

"Discretion is the better part of valor" Charles Churchill

The intuitive mind is a gift, and the rational mind is a faithful servant. But we have created a society that honors the servant and has forgotten the gift. (paraphrased) Albert Einstein

I come from a long line of sod busters, spanning back several centuries.

Last edited by Dutch; January 14, 2017 at 09:35 PM. Reason: Format
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Old January 15, 2017   #2
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Join Date: Dec 2007
Location: north central B.C.
Posts: 2,182

Thank you Dutch, for that interesting, succinct and easy-to-remember information.
"He who has a library and a garden wants for nothing." -Cicero
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Old January 15, 2017   #3
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Join Date: Dec 2013
Location: Jacksonville, Fl
Posts: 815

Thanks for posting this. It makes it easy to know which to use.
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