Water as potential source of Phytophthora citricola
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Research Institute of Pomology and Floriculture Pomologiczna 18, 96-100 Skierniewice, Poland
Leszek B. Orlikowski
Research Institute of Pomology and Floriculture Pomologiczna 18, 96-100 Skierniewice, Poland
Journal of Plant Protection Research 2007;47(2):125–132
Phytophthora citricola constituted about 70% of all Phytophthora isolates recovered from rhododendron leaves used as baits for detection of that group of organisms in water. The species was found in 4 rivers, 2 hardy nursery water reservoirs and nursery drainage canal from May to October, 2006. Analysis of spots’ number on rhododendron leaf baits as a measure of P. citricola density showed that place of holding baits had a significant influence on the species occurrence. Significantly more spots, especially in July survey, were observed on baits held in Skierniewka and Zwierzynka rivers swimming through agricultural and forest area than in Ner, the river of horticultural area. Significantly more spots/rhododendron leaves were observed when they were held in rivers downstream of nursery and in the middle of hardy nursery borders. In nursery water containers and drainage canal higher Phytophthora density was recorded in August than in other periods of surveying. Using water from reservoir for sprinkling of Picea omorika nursery trees caused the development of tip blight and from diseased twigs P. citricola was isolated.
The authors have declared that no conflict of interests exist.
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