First lessons from a European network of comparative plantations of hybrid larch varieties (Larix x eurolepis Henry)

Abstract

Hybrid larch is much appreciated by forest owners. However, hybrid seed production is often too scarce to meet national demand. Forest Reproductice Material importation could be a solution but that would require specific knowledge on European orchard quality. With that purpose, several research institutes jointly compared eight seedlots from seven orchards in seven sites across Europe. Survival, growth in height and diameter, and stem form were assessed at all sites in winter 2000/01 using a common protocol. Despite large variations in the environmental factors, the seed lots performed in a similar way in the different sites and, on average, the hybrids were more vigorous and at least as straight as the Japanese and European larch controls. An exception was FP 237 which had a very poor growth regardless of planting site. The most vigorous varieties were Esbeek, FH 201, Vaals and Halle; those with the best stem straightness were FP 237, FH 201 and Esbeek. At this early stage, Esbeek and FH 201 offer the best compromise for form and vigour. In addition, the results found at La Courtine were confirmed by further measurements carried out four years later.