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杨树病毒病的花叶类型,国外都先后报导在细齿杨(P.xeuramericana serotinaHart),美洲黑杨(Populus deltoidesMarsh)上发生。近来随着美洲黑杨无性系优良速生品系,如哈佛 Harvard(I-63/51),勒克斯 Lux(I-69/55),翁达 Onda(I-72/51)等的繁殖推广,病毒病就显得甚为突出,当前欧洲杨树育种,首先把抗病毒因素作为目标,此种明显“花叶”除表现在黑杨派杨树上外,也在青杨派杨树上发生,在欧美杨无性系上甚为常见。无性系中尤以“哈佛”(I-63/51)最感病,降低生长量
Populus virus disease mosaic types, have been reported in foreign countries in the sun gear (P.xeuramericana serotinaHart), Populus deltoidesMarsh occurred. Recently, with the promotion of superior fast-growing clones of poplar clones of Populus nigra, such as Harvard Harvard (I-63/51), Lux Lux (I-69/55), Onda Onda (I-72/51) It is very prominent, the current poplar breeding in Europe, the first antiviral factors as the target, this obvious “mosaic” in addition to performance Poplar in black poplar, but also in poplar poplar trees in Europe and the United States Poplar clones are quite common. Clones, especially “Harvard” (I-63/51) the most susceptible to reduce the amount of growth