Hi Bill
 
That is a good observation.  My bet as to what you saw at the entrance of
your colony is not sawdust but cappings (both brood and honey probably).
What you observed may tell you that your colony is raising brood and getting
plenty to eat.  When you get a nice warm day, it wouldn't hurt to pop the
cover and check how your colony is doing for stores (ie honey).  Once brood
rearing begins the colony starts using up honey at a much more rapid pace.
So it is a good idea monitor food resources during the last part of the
winter.  If you have any questions about wintering or feeding, please feel
free to contact me.
 
Regards
Gordy
 
****************************************
Gordon Allen-WArdell
Extension Apiculturist
University of Maryland
email  [log in to unmask]
 
301 405-3953