ISHS Acta Horticulturae 363: III International Symposium on Replant Problems
PROOF OF ACTINOMYCETES IN ROOTLETS OF SPECIES OF ROSACEAE FROM A SARD SOIL - A CONTRIBUTION TO THE SPECIFICITY OF REPLANT DISEASES |
| Authors: | G. Otto, H. Winkler, K. Szabó |
| Abstract:
In a soil with specific apple replant disease (SARD) actinomycetes were observed not only in the rootlets of apple, but also of pear and rowan. The mean frequencies and intensities of the infections in rowan were approximately as high as in apple; in pear these values were somewhat lower. The patterns of damage in the epidermal and cortical cells were not different for these three species of Rosaceae, though it seemed less pronounced in pear. No actinomycetes could be observed in the rootlets of mahaleb cherry, plum and rose. Since the substrate used in the experiment was a SARD soil from a site where pear or rowan had never been grown before, it is assumed that the range of host plants of the pathogenic actinomycetes of apple is not restricted to the Malus species, but does not include all genera of the Rosaceae. The results cause us to reconsider the question of specificity of soil sickness. | |
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