1976年10月上旬,临朐县果品公司邹积勋同志在该县龙弯村果园发现一株果实浓红的苹果单株,代号“7691”.其果实硬度大,肉质致密、细脆、酸味略强.为研究其利用价值,将树上的30余斤果实采下,与山东省果树研究所联系,进行贮藏试验.1976年10月中旬入库至1977年4月28日,库中其他品种苹果都已变质,唯有“7691”果实不皱皮,果肉不起沙,不发绵,仍然清脆甜酸适 In early October 1976, Comrade Zou Jixun, a fruit firm in Linqu County, found a fruit firm red apple plant, codenamed “7691”, in the fruit garden of Longcun Village in the county.Its fruit is hard, dense, crisp and slightly sour In order to study the value of its use, more than 30 pounds of fruit collected on the tree, and Shandong Fruit Research Institute, storage test .1976 storage in mid-April 28, 1977, the other varieties in the library Apple has been metamorphosed, only “7691 ” fruit is not wrinkled, the pulp can not afford sand, no sponge, still crisp sweet and sour