Code of Federal Regulations Title 7. Agriculture § 7.201.56–2 Sunflower family, Asteraceae (Compositae)

(A) Less than half of the original cotyledon tissue remaining attached.

(B) Less than half of the original cotyledon tissue free of necrosis or decay. (Remove attached seed coat for evaluation of cotyledons. Physiological necrosis is manifested by discolored areas on the cotyledons and should not be confused with natural pigmentation of some lettuce varieties.)

(A) Missing. (May be assumed to be present if cotyledons are intact.)

(B) Any degree of necrosis or decay.

(A) Deep open cracks extending into the conducting tissue.

(B) Severely twisted or grainy.

(C) Watery.

(A) Stubby or missing primary root. (Secondary roots will not compensate for a defective primary root.)

(B) Primary root tip blunt, swollen, or discolored. (Toxic materials in the substratum may cause short, blunt roots;  see § 201.58(a)(9).)

(C) Primary root with splits or lesions.

(A) Swollen cotyledons associated with extremely short or vestigial hypocotyl and root.

(B) One or more essential structures impaired as a result of decay from primary infection.

(C) Albino.

(A) Less than half of the original cotyledon tissue remaining attached.

(B) Less than half of the original cotyledon tissue free of necrosis or decay. (Remove any attached seed coats at the end of the test period for evaluation of cotyledons.)

(A) Missing. (May be assumed to be present if cotyledons are intact.)

(B) [Reserved]

(A) Deep open cracks extending into the conducting tissue.

(B) Malformed, such as markedly shortened, curled, or thickened.

(C) Watery.

(A) None.

(B) Weak, stubby, or missing primary root with weak secondary or adventitious roots. (Seedlings with roots bound within tough seed coats should be left in the test until the final count to allow for development.)

(A) One or more essential structures impaired as a result of decay from primary infection.

(B) Albino.