1945年在美国开始了由若干单位参加的联合育种计划,以寡基因抗性供体——东亚小果型种为基础,选育对黑星病免疫的苹果品种。后来加拿大和西欧的育种工作者也继续了这项工作。为了加强和加速育种过程,运用了人工接种方法(Hough等,1953)。 In 1945, a joint breeding program involving several units was started in the United States to breed apple cultivars that are immune to Scab based on oligo-resistant donors, the small East African fruit breed. Later breeders in Canada and Western Europe also continued the work. In order to strengthen and speed up the breeding process, artificial inoculation methods have been used (Hough et al., 1953).