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2011

Sammendrag

In spring and autumn 2011, we carried out a baiting program for Phytophthora spp. in urban streams and lakes in Rogaland and Hordaland counties in western Norway, and in a stream in a beech forest in Vestfold county in southeastern Norway. We used rhododendron leaves from the cultivar ‘Cunningham White’ as bait. Prior to baiting, all leaves were surface sterilized with 70% ethanol and placed in perforated bags (2-3 leaves per bag), each with a styrofoam floater to keep the bait near the surface. The bags were anchored to the shore and left in the water for 6-8 days. All locations were recorded with a field mapping GPS-device, and thus all mapping tasks could be finalized in the field. At many locations the leaves had dark and/or water soaked spots when removed from the water. Small sections from the leading edges were dissected and plated on Phytophthora-selective media (PARP and/or PARPH). One interesting finding was P. ramorum in a river in Rogaland county, but we also isolated a number of other Phytophthora spp. that are currently being identified. The results will be presented at the meeting.