Abstract
Hardwood cuttings of Bolleana poplar (Populus alba pyramidalis Bunge, cult Bolleana) were collected monthly during September 1967 to May 1968 and for the same period in 1968–69 and either stuck in a sand-rooting medium within a greenhouse or overwintered in polyethylene bags at 5.5 C. Most cuttings formed roots readily. From 60 to 95% of the cuttings collected and stored from October to April formed roots in the mist bed during May. Cuttings from the current season’s and previous season’s growth rooted equally well. Propagation was seriously impaired by the occurrence of a basal necrosis on the cuttings below the surface of the medium. The effect of indolebutyric acid (IBA) treatment in the promotion of rooting and basal necrosis varied with the time of collection and sticking. The IBA treatment replaced the effect of buds in the promotion of root formation.
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