Differences in the Occurrence of Fruiting Bodies in Birch Stumps between the C. purpureum Strain R53 and Other Treatments.

The effect of different treatments (C. purpureum strain), the basal area of investigated stumps, the number of saplings and the volume of trees around an investigated sapling on the probability of occurrence of fruiting bodies on birch (Betula pendula and B. pubescens) stumps in eight regeneration areas of spruce (Picea abies) three months (in 2011) and one year (in 2012) after the treatments (generalized linear mixed model results). The model for year 2013 was not estimated because the occurrence of fruiting bodies was too low (4%). All stumps except those in the liquid control have been included in the models. Statistically significant p-values (p p ≤ 0.10). The sign of a coefficient indicates whether an explanatory variable has an increasing (+) or decreasing (-) effect on the occurrence of fruiting bodies. See Fig. 4d. Note: the subscript of a C. purpureum progeny relates to the breeding phase (see Table 2).a The best parent stain based on an earlier study [13].b The best progenies from Phase 2.c The best progenies from Phase 3.Differences in the Occurrence of Fruiting Bodies in Birch Stumps between the C. purpureum Strain R53 and Other Treatments.