威县国营苗圃于1983年8月下旬用“丁”字形芽接法嫁接毛白杨65亩,采用的砧木为沙兰杨和加拿大杨,接穗有毛白杨雄株和雌株。半月后调查成活率为90％,但1984年春剪砧后,部分雌株接芽没有萌发,萌发的只占嫁接成活接芽的50％,雄株为85％。当嫁接成活的雌株毛白杨生长到60厘米左右,时间在5月中下旬时,大部分的植株叶片开始由上向下逐渐变黄,变黄的叶片 Weixian state nurseries in late August 1983 with “Ding” shaped bud grafting 65 acres of poplar, rootstock used for the Salmonella and Canadian poplar, scion male and female Populus tomentosa. Survival rate was 90% after half a month. However, some female plants did not germinate after sprout anvil in the spring of 1984, germinating accounted for only 50% of grafted surviving buds and 85% of male plants. When the grafted viable female plant Populus tomentosa grow to about 60 cm, the time in late May, most of the plant leaves began to gradually yellow from the top down, the yellow leaves