The University of Nebraska had students map out DCA's with
helium weather baloons tied to heavy fishing poles. Each
balloon had a capsule of queen phermone dangling via a
string. They located them mostly at about tree height in
places where there were "straight runs" like fence rows or
rows of trees or someother structures forming lines and
believe found they could identify "most likely" areas from
aerial photographs.
Dave
******************************************************
* Full guidelines for BEE-L posting are at: *
* http://www.honeybeeworld.com/bee-l/guidelines.htm *
******************************************************