近几年来我们在研究毛白杨插条育苗过程中,发现毛白杨插穗腐烂是影响插条成活的原因之一。为了防治插穗腐烂,曾作了一些试验,现将初步结果整理于后。一、症状毛白杨插条育苗、埋条育苗和留根繁殖等都有腐烂现象发生。毛白杨扦插或埋条后,需要经过一个多月切口才逐渐愈合,长出皮部根,同时皮孔胀破,在皮孔外形成白色愈合组织,即补充组织扩展到皮孔外。在此期间大部分插穗尚未生根,只能依靠母体贮藏营养维持生长和生活,依靠切口和皮部吸收水分等。因此,幼苗衰弱,抵抗力低,容易感染病害。生 In recent years, we are in the process of cutting poplar cuttings and found that the decay of Populus cuttings is one of the reasons that affect the survival of cuttings. In order to prevent cuttings decay, had made some experiments, the preliminary results are now sorted out. First, symptoms Populus cuttings nursery, buried nursery and stay roots have decay phenomenon. Populus cuttings or buried after the need to go through more than a month before incision healed, grow the skin roots, while leather hole burst, in the skin outside the formation of white healed tissue, that is, the extension of tissue to the lenticel outside. During this period most cuttings have not yet taken root, can only rely on the mother to maintain nutrition and nutrition to maintain their growth and life, relying on incision and skin absorption of water and so on. Therefore, seedlings weak, low resistance, susceptible to disease. Health