The use of excluders depends upon the stock. For example, Carniolans keep a
tight brood nest and these are not necessary vs. some Italian stock which
will tunnel the brood into the honey supers.
 
If you do use ecluders- give the queen 2 deep brood chambers.
 
Susan Cobey
Ohio State University
Dept. of Entomology
1735 Neil Ave.
Columbus, OH 43210
Tel.(614) 292-7928
Fax (614) 292 2180