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In 2009 on Begonia semperflorens stem base, brown conical spots spreading upwards to the first branching were observed. Affected plants wilted slowly and died. From diseased tissues Phytophthora cactorum was mainly isolated. Botrytis cinerea, Fusarium avenaceum and F. culmorum occurred only sporadically. In laboratory trials P. cactorum colonized leaves of Begonia semperflorens and Begonia × hybrida...
Badano występowanie Phytophthora spp. w 3 rzekach środkowej Polski. Badania prowadzono od marca do listopada w odstępie 2 miesięcy stosując do wykrywania liście różanecznika (Rhododendron sp.). Miarą liczebności Phytophthora spp. w wodzie była liczba nekrotycznych plam na liściach pułapkowych. Phytophthora spp. wykrywano we wszystkich terminach pułapkowania z liczniejszym występowaniem w maju i we...
Species of Phytophthora are a broad host-range group of plant pathogenic organisms affecting an enormous amount of plant species worldwide, including ornamentals, forest ecosystems, vegetables and fruit crops. For identification of Phytophthora species a conventional technique based on morphology of mycelium, sporangia and gametangia is mostly used. However, lack of reliable morphological markers...
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