ISHS Acta Horticulturae 751: IV International Symposium on Rose Research and Cultivation
RELATION BETWEEN GENEALOGY AND RESISTANCE TO ROSE ROOT ROT CAUSED BY PYTHIUM HELICOIDES |
| Authors: | L. Li, E. Shibata, N. Adachi, W. Yu, H. Fukui |
| Keywords: | disease severity, heredity, inoculation, progeny |
| Abstract:
Root rot (P. helicoides) has recently been reported in Ebb & Flow rose production systems in Japan. Disease severity was measured in six roses: Rosa multiflora, R. chinensis, R. × odorata (tea rose), R. hybrida ‘Cecile Brunner’ (polyantha rose), R. hybrida ‘Yellow Festival’ (miniature rose), and R. hybrida ‘SCHovian’ (floribunda rose). R. multiflora and R. chinensis were found to have the highest and lowest resistance, respectively. The disease severity of ‘Cecile Brunner’, which is a progeny of R. multiflora and R. chinensis, was intermediate to the two parents. R. × odorata was also found to be quite susceptible to root rot. ‘Yellow Festival’, a progeny of R. chinensis and ‘Cecile Brunner’ was susceptible. The resistance observed for ‘SCHovian’ was similar to that of R. multiflora, suggesting that resistance originated from R. multiflora, and is hereditary. | |
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