Field standards

1. Isolation. Prior to inspection, a field must be isolated from inseparable crops by a fence row, natural boundary, or by a strip at least five feet [1.52 meters] wide which is either mowed, sprayed, or uncropped. 2. Specific field standards. Maximum Tolerance Factor Foundation Registered Certified Other varieties * 0.1 percent 0.2 percent 0.2 percent Corn and sunflower plants bearing seed none none none Prohibited noxious weeds ** none none none Objectionable weeds *** none none none *Other varieties include plants that can be differentiated from the variety being inspected, but shall not include variants characteristic of the variety. **The tolerance for prohibited or objectionable weeds, or both, in the field will be determined by the inspector. ***Objectionable weeds include nightshade species and cocklebur.