Occurrence of Phytophthora citricola on ash (Fraxinus excelsior) in forest nurseries
Phytophthora citricola was found in 2 forest nurseries on 2-year old ash seedlings with stem and/or root rot symptoms. Additionally, among others 2 Fusarium species, Phomopsis sp. and Trichoderma spp. were isolated from diseased tissues. Isolates of P. citricola from ash, silver fir, beech, birch and rhododendron colonised leaf blades and stem parts of ash. In greenhouse trials 4 pathogen isolates from various plants caused stem base rot of ash seedlings. Necrosis spread about 0,65 mm per 24 hrs. This is the first report on the occurrence of P. citricola on ash seedlings in Poland.
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