Allen,
Contact Mark about this ([log in to unmask]). He has a grad student (Shawn Devlin) who established the relationship between different methods of monitoring and how accurate they were at estimating a colony's actual mite population.
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