Relative Tolerance of Nine Olve Cultivars to <em>Pseudomonas savastanoi</em> Causing Bacterial Knot Disease
Reactions of nine olive cultivars inoculated with olive or oleander strains of Pseudomonas savastanoi were evaluated under glasshouse conditions. Two quantitative indices of pathogenicity were used: 1. gall size from standardised inoculations, measured after 2 months; 2. rate of change of gall size...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Firenze University Press
2004-12-01
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| Series: | Phytopathologia Mediterranea |
| Online Access: | https://oajournals.fupress.net/index.php/pm/article/view/5093 |
| Summary: | Reactions of nine olive cultivars inoculated with olive or oleander strains of Pseudomonas savastanoi
were evaluated under glasshouse conditions. Two quantitative indices of pathogenicity were used: 1. gall size from
standardised inoculations, measured after 2 months; 2. rate of change of gall size with increasing inoculum concentration.
These two indices were combined in a single plot that appears to give the best resolution of all data. Responses
of olive cultivars to olive strains of P. savastanoi suggest that cultivars Carolea, Koroneiki, Leccino and
Pendolino are the most tolerant, and that Barnea, Manzanillo, Picholine, Picual and a South Australian selection of
Verdale are the least tolerant. Olive and oleander strains of P. savastanoi differed in virulence, and between-plant
variability in reaction to inoculation was noted. Hypersensitive reactions do not appear to be part of mechanisms of
tolerance. Olive strains of P. savastanoi affected all cultivars more severely than did equivalent inoculations with
oleander strains. |
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| ISSN: | 0031-9465 1593-2095 |