Susceptibility of several genotypes of Sorbus to Erwinia amylovora
Field studies were carried out in France on the susceptibility of several genotypes of Sorbus to Erwinia amylovora (EPPO A2 quarantine pest). Some confirmation trials were also done under glasshouse conditions. 17 clones of Sorbus were grafted on Crataegus monogyna seedlings. When plants had reached a sufficient size, they were inoculated with E. amylovora. Results were observed 4-6 weeks after inoculation. On the 17 Sorbus genotypes inoculated:
- 2 were found very susceptible: Sorbus aria cretica and S. aucuparia domestica;
- 8 were resistant (no symptoms observed): S. americana, S. arnoldiana, S. decora, S. fastigiata, S. hybrida, S. rossica major, S. scopulina;
-7 were partially resistant (in order of increasing resistance): S. latifolia, S. pohuashanensis, S. hupehensis obtusa, S. intermedia brauneri, S. gibbsii, S. discolor, S. heldreichii, S. decora.
The authors noted that S. aria and S. aucuparia have already been reported as susceptible in United Kingdom, Netherlands and USA. However, S. americana which was found resistant in France is considered as susceptible in USA.
Paulin, J.P.; Chartier, R.; Cadic, A. (1999) Sensibilité au feu bactérien de quelques représentants du genre Sorbus.
Phytoma - La Défense des Végétaux, no. 521, 62-64.