Bulk Vegetative Propagation of Hybrid Larch (Larix x eurolepis Henry)

1993

S. 205-215

26 Lit. Ang.

Unselbständiges Werk

200041412

To be efficient and economical, bulk vegetative propagation basically depends on the largest number of rooted cuttings per stock plant (multiplication rate) it is possible to obtain. A forcing method of hybrid larch stock plants under greenhouse conditions has been described. After 1 growing season, stock plant height reached 1m on average, ie between 0.9- 1.1m according to seed sources. Enhancement of branching by top pruning and/or BAP foliar spray (benzyl-amino-purine), production of micro-cuttings (3-4cm in length), and additional propagation with softwood cuttings have been tested in order to improve the multiplication rate. The best multiplication rate was obtained with micro-cutting: between 109-219 according to seed sources. With conventional cuttings (6-8cm in length), it reached 60, to which 33 plants could be added if further softwood propagation was carried out. For all the parameters evaluated, a high clonal variability was observed, resulting in a genetic modification of the vegetatively propagated "bulk" variety.