Abstract
Alder yellows phytoplasma was detected by PCR in Alnus glutinosa trees in the Palatine and Mosel areas of Germany. The restriction profiles obtained by TaqI and AluI digestion of a PCR amplified ribosomal DNA fragment from this phytoplasma and a periwinkle isolate of alder yellows from Italy (ALY) could not be distinguished while elm yellows isolates from Europe and North America led to different fragment patterns. Different restriction profiles for ALY and the German alder phytoplasma were obtained by TruI digestion of a non-ribosomal DNA fragment. Phloem feeding insects were collected from infected alder trees. Phytoplasmas of the elm-yellows group were detected by PCR in psyllids and the leafhopper Oncopsis alni. These pathogens were indistinguishable from the phytoplasma found in alder. Only O. alni was able to transmit the pathogen to healthy alder seedlings. Thus, it is the first insect known to transmit this phytoplasma. This leafhopper could be responsible for the ubiquitous infection of Alnus glutinosa due to its close association with alder and its wide distribution in Europe.
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Maixner, M., Reinert, W. Oncopsis alni (Schrank) (Auchenorrhyncha: Cicadellidae) as a Vector of the Alder Yellows Phytoplasma of Alnus glutinosa (L.) Gaertn.. European Journal of Plant Pathology 105, 87–94 (1999). https://doi.org/10.1023/A:1008602327715
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DOI: https://doi.org/10.1023/A:1008602327715