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本材料是意大利向国际杨树委员会1975年召开的第十五次会议上的报告,下述无性系中的一些品系尚在试验阶段,有些已用于生产。 1964年,Marssonina brunnea真菌传入意大利后,造成严重的杨树叶病害;因而希望能选育出一批有抗病能力的杨树无性系,这是因为,虽然化学防治病害效果明显,但对一些感性强的品系危害太大,在选育中也要考虑到对其他病害的抗性及所有特点,使无性系更利于生长。这里介绍的无性系有: a.北美杨(Populus deltordes)无性系: I-63/51、I 72/51、I 77/51和I-69/55; b.与本树种密切相关的杂交杨:I-72/58; c.欧美杂交杨(加拿大型):I-BL、ICB2和I-37/61;
This material was reported by Italy to the International Poplar Commission at its fifteenth meeting in 1975. Some of the following clones in the clones are still in the experimental phase and some have been used for production. In 1964, the fungus Marssonina brunnea introduced into Italy and caused severe poplar leaf disease. Therefore, it was hoped that a number of Poplar clones resistant to disease could be bred because, although the effect of chemical control was obvious, some Sensitive strains of the great harm, in breeding should also take into account the resistance to other diseases and all the features that make clones more conducive to growth. The clones introduced here are: a. Populus deltordes clones: I-63/51, I 72/51, I 77/51 and I-69/55; b. Hybrid poplars closely related to this tree species : I-72/58; c. European and American hybrid poplar (Canadian type): I-BL, ICB2 and I-37/61;