Bacteria from Pseudomonas spp. pathogenic on fruit trees | Patogene bakterije iz rodu Pseudomonas na sadnem drevju
2007
Dreo, T. | Pirc, M. | Ravnikar, M.
Bacteria of Pseudomonas spp. are common in nature. They are present on plants, in soil, water and in atmosphere. Their role in the life of plants is very diverse. While some contribute to the plant fitness, promoting growth and protecting from harmful organisms, others cause diseases. Usual symptoms include leaf streaks in monocotyledonous and leaf and fruit spots in dicotyledonous plants. In fruit tress Pseudomonas spp. is usually considered a minor pathogen causing only qualitative damage. In fact damage can be high when associated with frost damage. Blossom blast can cause high economic losses while twigs and bark cankers weaken general fitness of trees increasing their susceptibility. In the last years we have observed an increase in frequency and severity of the symptoms caused by Pseudomonas spp. In apple trees they can be indistinguishable from fire blight both in severity and extent. A large number of isolates was obtained from diseased plants, characterized with various laboratory methods and compared with control strains. Results of these comparisons will be presented.
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