Genetics and performance of Belgian poplar clones tested in Sweden
1996
Ilstedt, B. (Swedish Univ. of Agricultural Sciences, Uppsala (Sweden). Dept. of Forest Genetics)
In 1989 an exchange of genetic poplar material started within the International Energy Agency, I.E.A. Participating countries were Belgium, Canada, Finland, Sweden, United Kingdom and USA. The Department of Forest Genetics, SLU, Sweden, received 104 poplar clones from Belgium: 65 clones P. trichocarpa, one P. maximowiczii and 38 hybrids. The material grew well during the first growth periods, 1989-91, with height means at age 3 of 5.5 m for the highest clones. In spite of poor budset, with repeated flushes, the frost damage these years was not severe. In 1991 18 clones were selected, new clonal trials established and assessments were made in 1993-94. Altogether around 25 traits were studied. Variance components and broad and narrow sense heritabilities were calculated. In the trial with the selected clones the frost damage was severe. The meteorological statistics indicate that the circumstances of importance for the frost damage these years were sudden frost attacks that occurred rather early in the autumns of 1992 and 1993. The conclusion is that these genotypes originating from latitudes more than 10 degrees south of the test areas have too poor or too late budset and inwintering. We need a more hardy material, inwintering according to daylength and early enough for the trees to be well-prepared for sudden frost attacks during autumn
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