Indistinguishable seeds.

CFR · 2024-01-01 · US · Title 7

When the identification of the kind, variety, or type of seed or determination that seed is hybrid is not possible by seed characteristics, identification may be based upon the seedling, growing plant or mature plant characteristics according to such authentic information as is available. (a) (1) Fluorescence results are to be determined as test fluorescence level (TFL) to two decimal places as follows: (2) The percentage of perennial ryegrass is calculated as follows: (3) Using results from the above formula, the percentage of annual ryegrass is calculated as follows: (4) If the test fluorescence level (TFL) of a perennial ryegrass is equal to or less than the variety fluorescence level (VFL) described for the variety, all pure ryegrass is considered to be perennial ryegrass and the formula is not applied. (5) If the test fluorescence level (TFL) of an annual ryegrass is equal to or greater than the variety fluorescence level (VFL) described for the variety, all pure ryegrass is considered to be annual ryegrass and the formula is not applied. (6) A list of variety fluorescence level (VFL) descriptions for perennial ryegrass varieties which are more than 0 percent fluorescent and annual ryegrass varieties which are less than 100 percent fluorescent is maintained and published by the National Grass Variety Review Board of the Association of Official Seed Certifying Agencies (AOSCA). If the variety being tested is not stated or the fluorescence level has not been described, the

official document · source cfr-2024 · id 7:§ 201.58a