Two isolates of cherry leaf roll virus (GLRV), one from diseased beech and one from diseased birch trees in an area with forest decline near Bonn in West Germany, were found to be serologically closely related, but not indentical as assessed by spur formation of precipitin lines in agarose gel double diffusion tests. Such tests also distinguished these German CLRV isolates from ten other distinct CLRV isolates obtained from different natural hosts and from various countries. The German beech isolate was most similar serologically to isolates from walnut and from birch in England and the German birch isolate to an English cherry isolate and an isolate from Sambucits racemosa in Finland. These results provide further evidence of the antigenic diversity of GLRV.
Seit Mitte vorigen Jahrhunderts ist in vielen Veroffentlichungen Phytophthora cactorum als Erreger schwerer Pflanzenkrankheiten genannt worden. In der vorliegenden Arbeit wird eine Ubersicht iiber diese Veroffentlichungen gegeben, und durch eigene Infektionsversuche werden zu dem bisher bekannten Wirtsspektrum weitere Pflanzenarten gestellt. Weiter wird die Herkunfts-und Biotypenfrage erortert und schliefilidi eine Abgrenzung zu zwei anderen grofien Phytophthora-Gruppen -Ph. parasitica und Ph. palmivora -an Hand des Wirtsspektrums und der geographischen Verbreitung versucht als Erganzung der Arbeiten, die diese Phytophthora-Avten nach morphologischen oder physiologischen Merkmalen voneinander trennen.
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