Subchapter F. CORN—SINGLE CROSSES
GENERAL REQUIREMENTS Sec.
115.151. Identity.
115.152. Substitution of fertility-restoring line.
115.153. Substitution of male sterile line.
115.154. Seed shortages; substitution of seed.
FIELD STANDARDS
115.161. Land requirements.
115.162. Isolation requirements.
115.163. Inspection requirements.
115.164. Mixture requirements.
STAND REQUIREMENTS
115.171. Planting ratio.
115.172. Pollen-shedding plants.
115.173. Destruction of noncertified plants.
SEED STANDARDS
115.181. Seed house inspection.
115.182. Drying, purity and germination.
GENERAL REQUIREMENTS
§ 115.151. Identity.
A single cross shall consist of the first generation of a hybrid between two certified inbred lines.
§ 115.152. Substitution of fertility-restoring line.
A fertility-restoring line may be substituted for its normal counterpart in a Foundation single cross, provided that the restoring line has been back-crossed for no less than five generations to its normal counterpart and the pollen restoring line is the same in other characteristics as its normal counterpart.
§ 115.153. Substitution of male sterile line.
A male sterile line (cytoplasmic) may be substituted for its fertile counterpart as one parent of a Foundation single cross, provided that the male sterile line has been back crossed for no less than five generations to its fertile counterpart and the male sterile line is the same in other characteristics as its fertile counterpart.
§ 115.154. Seed shortages; substitution of seed.
In cases of serious shortages of seed stock, second generation seed may be accepted for certification as Foundation hybrids, with the specific approval of the Pennsylvania Agriculture Experiment Station. The second generation seed may be produced by one of the following methods:
(1) As the result of hand-pollination among pollen parent plants in an isolated plot or field in which a certified commercial hybrid is being produced.
(2) As a result of hand-pollination among pollen parent plants in a breeding nursery.
(3) From an isolated field devoted to increase single crosses which were properly inspected and approved.
FIELD STANDARDS
§ 115.161. Land requirements.
Single cross plots should not be planted on land that has grown corn the preceding season.
§ 115.162. Isolation requirements.
(a) Single crossing plots of field corn which are not hand-bagged shall be made in a plot isolated at least 660 feet from other corn, and 1,320 feet from corn of other color and sweet or popcorn.
(b) If sweet corn or popcorn plots are found within 1,320 feet distance of a single crossing plot of field corn, the grower shall be immediately notified, and he shall have the sweet corn or popcorn plots completely destroyed or detasseled before silks emerge on the female seed parent.
§ 115.163. Inspection requirements.
Tassels shall be removed so that no more than .5% of the plants in the seed parent rows shed pollen on any one inspection, or not more than .75% as the total of any three inspections, have shed pollen while more than 3% of the seed parent plants have receptive silks.
Source The provisions of this § 115.163 amended September 26, 1975, effective September 27, 1975, 5 Pa.B. 2522. Immediately preceding text appears at serial page (1807).
§ 115.164. Mixture requirements.
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.
Source 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).
STAND REQUIREMENTS
§ 115.171. Planting ratio.
Single crossing plots shall be planted in a ratio not to exceed two seed parent rows to one pollen parent row. Plots may not be less than .5 acre.
§ 115.172. Pollen-shedding plants.
There shall be 1,000 pollen plants per acre capable of shedding pollen during the pollination period. If the stand of plants is reduced below this ratio, any seed accepted for certification shall be produced on hand-pollination plants.
§ 115.173. Destruction of noncertified plants.
Portions of single-cross plots not meeting certification requirements shall be destroyed before field inspection is completed if the balance of the plot is to qualify for certification.
SEED STANDARDS
§ 115.181. Seed house inspection.
(a) Ear inspection shall be made after the seed is harvested, dried, culled, ear picked (ready for shelling). If found to contain more than .1% off-type ears, or any kernels pollinated by other corn, the lot of seed may not be considered satisfactory for certification and shall have to be reworked and reinspected before shelling.
(b) Lots of seed found shelled before ear inspection shall be disqualified for certification.
(c) If the lot is approved upon ear inspection, it may then be shelled and graded in preparation for final certification.
§ 115.182. Drying, purity and germination.
Seed of single-crosses shall be harvested and dried to 14% moisture or less as soon as possible after the corn is mature with a minimum purity of 99% and a germination of 90% or more.
Source The provisions of this § 115.182 amended September 26, 1975, effective September 27, 1975, 5 Pa.B. 2522. Immediately preceding text appears at serial page (1809).
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