Selection of a genotype of Cotoneaster with a high level of resistance to fire blight
2002
Bellenot-Kapusta, V. | Chartier, R. | Brisset, M.N. | Paulin, J.P.
Cotoneaster is, among the host plants of Erwinia amylovora, the genus which contains the highest number of 'susceptible' and 'very susceptible' genotypes to fire blight (circa 70%). What is more, the number of very resistant cultivars - if any - is very limited. In this context we attempted to create a new genotype. Seeds were collected from the less susceptible varieties in our collection. About 555 plants derived from 27 different varieties were tested for three successive years by inoculation of one strain of E. amylovora (CFBP 1430). As a result, only a few genotypes showed no symptoms and among them one, derived from C. dammeri 'Eichholz', was finally selected with this strain. This genotype was confirmed as 'fairly resistant' under repeated inoculations with a number of strains of E. amylovora.
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