Wood natural decay resistance is mainly restricted in the heartwood part of tree and based on wood microstructure and chemical composition. However, the variation of decay resistant in different wood species is vide and the effect of genotype on decay resistance of Siberian larch wood grown in Finland is not known. The aim of this work was to find out the variation on decay resistance of Siberian larch from different genotypes using a preliminary screening test based on a malt agar block decay test (a modified EN 113 test). The increment core samples were collected in October 1997 from 53 different clones and the decay tests started in January 1998 and were finished at the end of March 1998. In future, these results can be used to find most decay resistant material for forest tree breeding.

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