一、选育过程“6901”是砀山酥梨的一个芽变单系。1969年由代义恩同志在该县良梨公社良梨大队代庄生产队村东老梨园一株70年生酥梨树(砧木为杜梨)上发现的。该树树体高大,树势健壮,呈自然圆头形,1970年以来产量均在350～450斤。其变异枝发生在北向大主枝上部多年生部位的隐芽,向西北斜生。变异枝的叶片较酥梨大而厚;果实个大, First, the breeding process “6901” Dangshan pear is a bud change single line. In 1969, Comrade Dai Yi-nien was found on the 70-year-old Pear tree (the rootstock is Du pear) in Donglailiyuan Village, Liangzhao Village, Liangzha village, Liangli commune, Liangli commune. The tree tall, strong tree vigor, was a natural round-shaped, since 1970, the yield was 350 to 450 pounds. The mutant branches occur in the hidden buds of perennial sites in the upper part of the north main line, and are inclined to the northwest. Variant branches leaves larger and thick than pear; a large fruit,