Investigations of diseased oaks (Quercus robur L.) grown in urban areas

摘要

Oaks belonging to hardwood trees are native in Germany. They are of particular importance due to economic and ecological means. Virus-suspected leaf symptoms as there are mosaic, mottling and chlorotic ringspots were observed in northern and western Germany. These alterations are characteristic and may be marked off clearly to symptoms induced by abiotic factors (extreme climate, ozone), pests (Phylloxera coccinea) or fungal pathogens (powdery mildew, Microsphaera alphitoides). The aim of our studies is the mechanical transmission of the pathogen to herbaceous indicator plants and its electronmicroscopic visualization. Constructive of these data the isolates will be further characterized by applying serological and molecularbiological methods.