North American Fruit Explorers mailing list at ibiblio

["Ernest Plutko" <ernestplutko@wiktel.com>]

Bt doesn't persist so it is unlikely it would be in the garden for
long.  Scientists are working on a more persistent type of Bt.  Bt is
not harmful to humans so I would not be reluctant to use it on crops.
Far safer than poisons.  I am always outraged when crop dusting
planes are flying here.

zone 2/3