ISHS Acta Horticulturae 315: Peach, XXIII IHC
TOLERANCE TO LEUCOSTOMA PERSOONII IN PEACH |
| Authors: | A.F. Iezzoni, L. Chang, G. Adams |
| Abstract:
Perennial (Cytospora) canker, incited by Leucostoma persoonii or L. cincta, seriously limits peach tree longevity and productivity in the colder peach growing areas (Dhanvantari, 1978). Leucostoma is a weak pathogen which enters through dead or dying tissue. Once established in the dead tissue, the fungus may continue to invade the live tissues around the wounds causing extensive cankers. Winter injured tissue is frequently the most important infection site. Limb and trunk cankers may result in loss of major scaffold limbs or whole trees. In 1985, a project was initiated with the objective of identifying a source of tolerance to Leucostoma in peach. Our results to date indicate that open-pollinated progeny from the Russian cultivar Yennoh have a higher level of tolerance to L. persoonii than had previously been reported in the U.S. literature (Chang et al., 1989). Subsequent studies indicated that this tolerance was highly heritable and therefore might be simply inherited (Chang et al, 1991). Therefore, our first objectives were to determine the inheritance of L. persoonii tolerance and the association of this tolerance with cold hardiness. Since our previous experiments were done with one L. persoonii isolate, our next objective was to test whether the tolerance observed was stable across Leucostoma isolates. | |
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