ISHS Acta Horticulturae 410: II International Cherry Symposium
RESISTANCE BREEDING IN SWEET CHERRIES |
| Author: | M. Fischer |
| Abstract:
A method of testing for resistance to Cytospora spp. (Valsa canker) in sweet cherries (Kaltschmidt and Fischer, 1986; Kaltschmidt, 1990) was adapted for use in the breeding work at Pillnitz. Eventually we hope to combine excellent fruit quality with high yields, dwarf growth habit, self-fertility, and resistance to bark damage, winter injury, Cytospora and Pseudomonas. Testing for Cytospora and Pseudomonas resistance will be associated with recording winter hardiness because bark injury, caused by low winter temperatures, provides openings for fungi and bacteria. The first Cytospora tests of Pillnitz sweet cherry germplasm identified the following resistant cultivars: 'Burlat', 'Hudson', 'Merton Heart', 'Span'sche Knorpel' and the Pillnitz selections 'Nanni', 'Nalina' and 'Nadino'. 'Van', 'Hedelfinger', 'Kassins' and 'Lambert' were confirmed to be very susceptible. Those cultivars tested for Pseudomonas syringae were susceptible in varying degrees. Resistance and susceptibility to Cytospora did not appear to be related to that for Pseudomonas. The two characters seem to be independently inherited. Enough variation in resistance to Cytospora exists to provide a foundation on which to base a successful breeding program. | |
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