bacillus thuringiensis shelf life

[Pierre A Plauzoles]

In a previous article, paulcher at CONCENTRIC.NET (Paul Cherubini) says:

>Semjase,
>
>The man said the bacillus thuringiensis is not killing his moth
>caterpillars no matter how much he drenches them and the host plants
>with the stuff. You said b.t. is a "destroyer of butterflies of all
>types bar none" and areas sprayed with it (e.g. for moth control) are
>"contaminated for years to come".  This doesn't explain why his b.t. has
>failed to kill his moth caterpillars. 

Paul,

While I respect your expertise, it is to be noted that Bt is a very big 
factor in the destruction of a large number of speceies of lep 
populations.  I too would destroy the stock of the stuff I had if I had 
some.  On the other hand, I have heard that there are strains that last 
only a short time.  This may be the case here.

-- 
Pierre Plauzoles   ae779 at lafn.org
Canoga Park, California