PROBLEM TO BE SOLVED: To provide a method for testing loquat canker( A-strain fungus ) resistance using a DNA marker, enabling more individuals to be dealt with through enabling their early-stage selection at seedling stage, capable of cutting raising seedling cost( fertilizer, water, pots, personnel expenses ), thereby capable of efficiently carrying out raising a resistant variety. SOLUTION: A primer for amplifying the marker for testing loquat canker( A-strain fungus ) resistance containing part of a DNA comprising a specific base sequence and represented by the specific sequences mentioned below: 3. tgcgaaggct 4. ggtgtggttc 5. tgggagctga ataggaatac 6. aaagatcgtt taaccgttgg, is provided. COPYRIGHT: (C)2004,JPO&NCIPI