老龄宝珠梨树的更新改造技术宝珠梨在我县栽培历史已超过２００年。是云南省地方名优水果。７０年代末，由于管理差，梨黑星病发生严重，经济效益低，梨园多被淘汰，仅存金钟乡８００余株８０年生以上的老龄树。１９８７年以来，我们采用综合管理措施进行更新改造，取得了... Renovation of aging Baozhu pear tree Baozhu cultivation history in our county has more than 200 years. Is a famous local fruits in Yunnan Province. In the late 1970s, due to poor management, serious occurrence of pear scab and low economic benefits, many pear orchards were eliminated, leaving only 800 or more elderly trees aged over 80 years in Jinzhong Township. Since 1987, we have adopted an integrated management measures to update and rebuild, and achieved ...