The wood anatomy was studied of 180 young spruce trees of 30 clones fumigated with SO2. The resulting data were assessed using rank correlation statistics, factor analysis and analysis of variance. In the year before fumigation none of the measured characteristics showed any correlation with the degree by which clones were damaged after fumigation. Genetic effects were assessed to be responsible for 65% of latewood width variation prior to fumigation. In the treatment year as well as in the subsequent year there was a correlation between some of the characteristics measured and the degree of damage, and in the same period genetic influences accounted for only 10% of latewood width variation. Two years after fumigation no correlations between the measured wood anatomical characteristics and the degree of damage could be detected.
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