Hi Allen,
Here is a site with some mode of action info on imidacloprid:
ipmworld.umn.edu/chapters/bloomq.htm
Regards
Adony
Adony Melathopoulos
Apiculture Biotechnologist
Agriculture and Agri-Food Canada
Beaverlodge Research Farm
Box CP 29
Beaverlodge, Alberta CANADA
T0H 0C0
T +1 780 354 5130
F +1 780 354 8171