“汉森2168”和“汉森536”是由已故的C.J.Hansen 分别于1962年和1964年用扁桃 B×桃株选1—8—2的杂种实生苗的群体中选出的(图1).扁桃亲本是偶然发现的一株实生苗,起初认为它抗线虫病,但试验结果证明并没有抗线虫的能力。桃株选1—8—2是由 Qkinawa 桃×H91桃的后代。H91是山桃和中国桃 PⅠ6582杂交的实生苗。该株选对南方根结线虫和爪哇根结线虫都具有免疫 “Hansen 2168” and “Hansen 536” were selected from the group of hybrid seedlings of the late CJHansen in 1962 and 1964, respectively, with the selection of almond B × peach 1-8-2 (Figure 1) .Almonds were accidentally discovered as a seedling, initially thought to be resistant to nematodes, but the test results showed no resistance to nematodes. Peach selection 1-8-2 is from Qkinawa peach × H91 peach offspring. H91 is a seedling hybrid between Peach and Peach PⅠ6582. The strain selected on the southern root-knot nematodes and root-knot nematodes are immune