Current through Register Vol. 50, No. 11, November 20, 2024
Section XIII-743 - Hybrid Seed Corn Certification Standards (Formerly Section 173)A. Eligibility Requirements. Hybrid corn may be one of the following. 1.SingleCross-the first generation hybrid between two inbred lines.2.Double Cross-the first generation hybrid between two single crosses.3.Three-Way Cross -a first generation hybrid between a single cross and an inbred line.4.TopCross-the first generation hybrid of a cross between an inbred line and an open-pollinated variety or the first generation hybrid between a single cross and an open-pollinated variety.5.Foundation Single Cross -a single cross used in the production of a double cross, a three-way, or a top cross.B. Field Inspection 1. Seed fields shall be inspected at least once prior to the pollination period for purity as to plant type. Any off-type or doubtful plants must be destroyed before they shed pollen.2. At least three field inspections shall be made during the pollinating period, said inspections to be made without previous notification to the grower.C. Field Standards 1. Unit of Certification. The entire acreage of any one specific commercial hybrid must be entered for certification.2. Isolation Requirements. Fields in which commercial hybrid corn is being produced must be so located that the female parent is not less than 660 feet in all directions from other corn of a different kernel color or type (sweet, pop, flint, white, red, etc.).3. Border Rows. When the kernel type and color of the corn in the contaminating field are the same as those of the parent in the crossing field, the isolation distance may be modified by the planting of border rows of the pollen parent. The following table indicates the minimum number of border rows required for fields of various sizes when located at different distances from other corn. Minimum Distance from Other Corn | Field Size |
1 to 20 acres | 20 acres or more |
Feet | (Minimum) Border Rows |
410 | 0 | 0 |
370 | 2 | 1 |
330 | 4 | 2 |
290 | 6 | 3 |
245 | 8 | 4 |
205 | 10 | 5 |
165 | 12 | 6 |
125 | 14 | 7 |
85 | 16 | 8 |
0 | 10 |
a. The above isolation requirements do not apply to crossing fields when the same male or pollen parent is used in each. In such cases the two fields must be clearly divided by use of an area not less than 14 feet or a natural boundary which is permanent and distinctive (e.g., ditch, road, headland, etc.).4. Detasseling a. A commercial hybrid will be disqualified for certification when 5 percent or more of the female seed parent plants have receptive silk: i. if more than 1 percent of the female seed parent plants have shed pollen on one inspection; orii. if a total of 2 percent of the female seed parent plants have shed pollen on three inspections.b. Sucker tassels, portions of tassels or tassels on main plants will be counted as shedding pollen when 2 inches or more of the central stem, the side branches, or a combination of the two have anthers extended from the glumes. In cases where a few silks are out and tassels of the seed parent have begun to shed pollen, the field can be approved by immediate and complete detasseling of the seed parent and removal of the ear shoots with exposed silks, if done to the satisfaction of LDAF.D. Seed Standards Factor | Certified Class |
Pure Seed | 98.00% |
Inert Matter | 2.00% |
Other Varieties | 0.50% |
Noxious and Other Weeds | None |
Off-Color, Off-Type Kernels | 0.10% |
Germination | 90.00% |
La. Admin. Code tit. 7, § XIII-743
Promulgated by the Department of Agriculture, Seed Commission, LR 8:572 (November l982), amended LR 9:197 (April l983), amended by the Department of Agriculture and Forestry, Office of Agricultural and Environmental Sciences, Seed Commission, LR 12:825 (December l986), LR 13:156 (March 1987), repromulgated LR 13:232 (April l987), amended LR 15:613 (August 1989), LR 20:643 (June 1994), repromulgated by the Department of Agriculture and Forestry, Office of Agricultural and Environmental Sciences, Agricultural Chemistry and Seed Commission, LR 39:2723 (October 2013), amended LR 40:755 (April 2014), repromulgated LR 40:993 (May 2014).AUTHORITY NOTE: Promulgated in accordance with R.S. 3:1433.