梨是北京地区栽培的主要果树之一,栽培历史久,品种资源多,且栽培面积很广。北京地区栽培的梨品种,多数属白梨和秋子梨系统,只有少数是砂梨或西洋梨系统。近年来,随着商品化生产的发展,优良品种的比重不断上升,而品种数却日趋减少。在这种情况下,由于多数品种自花不孕,所以授粉 Pear is one of the main fruit trees cultivated in Beijing. It has a long history of cultivation, many species resources, and a wide cultivation area. Pear cultivars cultivated in Beijing, most of which are white pear and autumn pear system, only a few are sand pear or pear system. In recent years, with the development of commercial production, the proportion of fine varieties has been on the rise, while the number of varieties has been declining. In this case, pollination occurs because most varieties are self-fertile