Видове Phytophthora обитаващи средното и долно течение на река Тунджа в България (Bulgarian)

Phytophthora Species Inhabiting Middle and Lower Watercourse of Tundzha River in Bulgaria. (English)

Identification of Phytophthora species along the Tundzha River in Bulgaria was conducted as a part of thorough research on the distribution of those organisms in the rivers of the country. The isolation of oomycete species of the genus Phytophthora was performed by baiting method with Rhododendron leaves, placed in areas of middle and lower watercourse of the river. The exact species of obtained isolates were determined on the base of colony and spore morphology and sequence analyses of the ITS region of the nuclear DNA. A difference in the composition of Phytophthora species inhabiting the middle and lower course of the river was found. In the middle stream of the river predominantly the species P. citricola and P. plurivora were registered which are known as pathogens with wide host range including raspberry, hop, orchards (walnut, almond, apricot, peach, cherry) often grown in mountain and semi mountain areas, as well as forest trees (beech, oak, chestnut, poplar). In the lower flow of the river mainly the weak pathogenic species P. lacustris was isolated. P. hydropathica was also found in both middle and down streams of the Tundzha River. [ABSTRACT FROM AUTHOR]

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