Fytoftoroza - nowa choroba Mandevilla sanderi w Polsce

Summary Chlorosis of leaves, their necrosis and development of stem base rot were observed on about 7% of dipladenia grown in greenhouse conditions. Necrosis observed on the stem base of such plants spread upward and on the root system. Phytophthora niederhauserii was isolated from all analyzed, diseased plants as well as from substratum. In addition Botrytis cinerea, Fusarium avenaceum and F. solani were sporadically isolated from diseased plants as well. On dipladenia organs inoculated with P. niederhauserii necrosis spread about 6–8 mm/24 hrs. The obtained results are the first information reporting the occurrence of P. niederhauserii on dipladenia in Poland.