Provided are a novel method for determining astringency peel-off properties of a plant of the genus Castanea, and a novel primer set used for determining astringency peel-off properties. A method for determining astringency peel-off properties in a plant of the genus Crium, comprising determining astringency peel-off properties based on a length of a DNA region amplified by PCR using a primer consisting of a base sequence of SEQ ID no: 1 and a primer consisting of a base sequence of SEQ ID no: 2 in DNA of the plant of the genus Crium. None

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