In a message dated 07/04/02 06:03:04 GMT Daylight Time,
[log in to unmask] writes:

<< > How large a hole can a bee propolize closed?...

 I think there is a natural reaction to stuff propolis in any crack that they
 can get a tongue into, but not a head. Holes larger than this can be
 bridged, but I think a different mechanism is at work.
  >>

I have a Top Bar Hive with the entrance hole at one end.  This hole can be
described by joining your finger tip to thumb tip.  The bees once made a
propolis screen reducing the entrance to a single bee way in the centre of
the hole.  Wasps were troublesome that year but I don't know whether that was
the reason for this behavior.

Chris