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Article: ABCs of Bt, a "natural" pesticide: Question

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Forum: Article: ABCs of Bt, a "natural" pesticideReplies: 5, Views: 71
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darius

darius
So.App.Mtns.
United States
(Zone 5b)

April 19, 2009
2:27 PM

Post #6431860

Since Bt is a microorganism, can it live in soil like other microorganisms?

Also, how can it be used on the grubs of the Japanese beetles that are right now buried about 2" down in the soil? Do you have to wait for them to emerge? Wait for the next crop of beetles to mature and breed, then hopefully treat the larvae before they burrow?

sallyg

sallyg
Anne Arundel,, MD
(Zone 7b)

April 19, 2009
3:29 PM

Post #6432110

Quick answer top of my head because of personal business today---these Bt organisms are natural soil bacteria (somewhere not sure of the extent of range) But since leaf caterpillars and grubs aren't IN the soil eating they aren't affected.
Japanese beetle grubs are treated with Milky spore which is another organism--Bacillus popillae????I believe Milky spore causes an overall fungal infection, not a gut infection/ reaction like Bt. Beetle grub s won't emerge until they are adults and the Bts are said to only be lethal at the larval stage.

Got to go but will check later for followup if you like. Sally

darius

darius
So.App.Mtns.
United States
(Zone 5b)

April 19, 2009
4:42 PM

Post #6432348

I know about using milky spore, thanks. It was just a curiosity, and makes sense that the dormant grubs don't eat.

sallyg

sallyg
Anne Arundel,, MD
(Zone 7b)

April 20, 2009
2:26 AM

Post #6434888

^_^ I felt sure you were familiar with milky spore.
I guess the essence is that we currently don't know of a Bt organism that poisons grubs while they eat the grass roots, the way these Bts poison above ground larvae.
jansrosegarden
Glendale, AZ
(Zone 9a)

April 21, 2009
5:01 AM

Post #6440810

Does BT work on grape leaf skeletinizer?

sallyg

sallyg
Anne Arundel,, MD
(Zone 7b)

April 21, 2009
3:25 PM

Post #6442216

Here is the Bugfiles page for that guy
http://davesgarden.com/guides/bf/go/234/
on which one commenter says it is.
"Leaf feeding caterpillars" is about as specific as I read about how many caterpillars are killed by Bt. I would have liked a more specific statement (all leaf feeding Lepidoptera larvae, or all Lepiodptera larvae) but haven't come across it.
Good luck!

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