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  B.t. var. israeliensis
From: Mark Evans <LIBEVANS at ACS.EKU.EDU> on 1997.06.20 at 00:01:56(877)
In response to queries concerning B.t.......

Bacillus thuringiensis var. israeliensis has been approved for use on
mosquito larvae. B.t. used to be used only on lepidoptera larvae, but
several varieties have been introduced over the last decade that are
effective against the larvae of other insects. B.t. var. israeliensis
is usually available from 'organic' pest control catalogs in the form of
little floating 'doughnuts.' These are easy to break apart for use in
smaller containers than the fish pools for which they were intended.

It sounds great in theory and is somewhat effective, but gambusia (fish)
are much more effective and fun to watch. Nothing is cheaper than a
guppy. Now back to aroids.....


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