7 Pa. Code § 115.164
Apparent mixtures shall be properly rogued from the pollen (male) parent before the seed (female) parent silks. The seed parent shall be carefully rogued throughout the growing and harvesting season. To be acceptable, plots shall show less than .1% off-type plants shedding pollen, in the pollen parent row, or a total of 2% of doubtful plants during any one inspection.
The provisions of this § 115.164 amended September 26, 1975, effective September 27, 1975, 5 Pa.B. 2522. Immediately preceding text appears at serial page (1807).