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二十世纪梨是砂梨系统的日本梨品种。1957年引进上海地区后,栽培面积迅速扩大,60年代曾作为“上海蜜梨”的主要品种出口外销。后因梨黑斑病,产量逐年下降,有的田块甚至无收。郊区梨园先后砍伐二十世纪梨,改接其他品种或改种其他果树。现仅有个别果园留有少数二十世纪梨植株。为了选育适宜本地区的高产、优质和抗病的梨树新品种,我们于1970年开始,就“二十世纪”梨杂交后代的果实成熟期、果形、皮色、风味及对梨黑斑病的抗病性等性状的遗传作了试验研究。
Twentieth century pear is a pear system of Japanese pear varieties. After the introduction of the Shanghai area in 1957, the cultivation area expanded rapidly. In the 1960s, it was exported as the main species of “Shanghai Honey Pear”. After due to pear black spot, the output decreased year by year, and some plots did not even close. Suburban pear garden has cut down the 20th century pear, change to other varieties or re-planting other fruit trees. Only a few individual orchards leave a few twentieth century pear plants. In order to breed new varieties of high yield, good quality and disease-resistant pear suitable for the region, we started in 1970 to study the fruit maturity, fruit shape, skin color, flavor and the effect on the pear black Blot disease resistance traits such as genetic made experimental study.