Ársrit Ræktunarfélags Norðurlands


Ársrit Ræktunarfélags Norðurlands - 01.01.1966, Page 74

Ársrit Ræktunarfélags Norðurlands - 01.01.1966, Page 74
80 mátti oft sjá eitt og eitt tré iðjagrænt í ryðbrunnu skógar- hafinu. Það er vitað að ryðsveppir eru afar nákvæmir í vali tegunda, sem þeir sýkja. Hér er því ef til vill fundinn einn möguleiki til að aðgreina tegundir eða afbrigði birkisins hér á landi. Birkið er okkar einasta skógartré, og því ættum við að láta okkur annt um að kanna það frá sem flestum sjónar- miðum, og einnig þá þær lífverur sem hrjá það. Summary. The Birch Rust, Melampsoridium betulinum (Pers.) Klebh., was re- corded in the year 1922, for the first time in Iceland, from Hallorms- staður in East Iceland, growing on seedlings of White Birch (Betula pubescens) in a nursery garden. In the summer 1937, the Norwegian mycologist, Ivar Jörstad travelled in Iceland. and failed to find the fungus there, but in the summer 1939 when he travelled in Iceland again, he found the fungus in some few places. According to Ingölfur Davíðsson, there was much infection in the year 1945, and another rust year was observed by the present writer in 1960. The Birch Rust is doing much harm on young seedlings in the nur- series, in every year. It seems to be favoured by the cultivation of Larch (Larix), that was already growing at Hallormsstaður on the date of the first recording of the Rust from there. Heimildir. Ferdinandsen, E. og C. A. Jörgensen: Skovtræernes Syg- domme. Gaumann, E.: Die Pilze. Basel f949. Ingólfur Davíðsson: Rannsóknir á jurtasjúkdómum. Rit Landbúnaðardeildar. Sami: Gróðursjúkdómar og varnir gegn þeim. Reykjavík 1962. Jörstad, I.: Norske Skogsykdommer. Medd. f. d. norske skog- forsöksv. Sami: The Uredinales of Iceland. Skr. utg. av d. norske Vidensk. Akad. Oslo. Mat. naturv. Kl. Oslo 1951. Larsen, P.: Fungi of Iceland. Bot. of Icel. Kli. 1932.
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