Phytophthora cryptogea - a new pathogen of perennial plants in Poland.

摘要

Phytophthora cryptogea was isolated from diseased stem base of Aquilegia discolour and rotted leaves of Saxifraga and Sempervivum spp. In laboratory trials P. cryptogea colonised most of Sempervivum species and cultivars except S. soculiferum. The isolates from Alstroemeria aurantiaca, Gerbera jamesonii, Saxifraga arendsii, S. paniculata, Sempervivum arachnoideum colonised Sempervivum and Aquilegia leaves with the fastest spread of necrosis on plant parts inoculated with cultures from Gerbera jamesonii in both cases. The isolate from S. arendsii colonized five species and cultivars of Saxifraga. In laboratory tests, the isolate of P. cryptogea from houseleek grew on PDA and colonized leaves of that plant at temperature ranging from about 10 to 32,5 degrees C with optimum at 20-30 degrees C.