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Sorbus is a large genus in the rose family (Rosaceae), and counts several hundered species world wide. Today, the genus contains thirteen wild growing species in Norway. Several of these are endemic; growing only in Norway, and some are considered to...
Recently formed shoots are not frost tolerant, and the risk of frost damages in the autumn increases as growth cessation is delayed. Actually, lammas shoots may also enhance the risk of frost damages during the winter. Lammas shoots is not...
2006 was a good year for seed production, and the Swedish seed orchards for spruce produced almost twelve tons of seeds. This is enough for 1.2 billion plants that can regenerate 450 000 hectares. However, good years for seeding occur...
By Egbert Beuker, Finnish Forest Research Institute Evoltree includes 44 partners from 15 European countries, and it links four major disciplines (genomics, genetics, ecology and evolutionary studies). One of the sites chosen for intensive study is located in Punkaharju in...
By Mari Mette Tollefsrud, Norwegian Forest and Landscape Institute In Northern Europe only one main genetic main group is found, compatible with expansion out of one refugium which was in the southern part of Russia. In Central and Southern Europe,...
What can be done? Without knowing the basic biology of the fungus it is difficult to take appropriate actions against the disease, it is like fighting an invisible enemy. Some governments have decided to put restrictions on transfer of seeds...
