1. (1) The field shall be considered the unit of certification. A strip at least five feet in width and which is mowed, uncropped, or planted to some other crop shall constitute a field boundary.

2. (2) Isolation requirement. Fields for the production of certified seed shall be isolated from other strains of bluegrass by five rods.

   (b) Specific requirements.

   Smut maximum	0.50%
   Other varieties including offtype plants	100%

(a) General.