ISHS Acta Horticulturae 169: International Workshop on Improvement of Sweet and Sour Cherry Varieties and Rootstocks
SWEET CHERRY BREEDING PROGRAMME AT THE SWISS FEDERAL RESEARCH STATION II. RESULTS OF BACTERIAL CANKER RESISTANCE AND SEEDLING VIGOUR |
| Author: | R. Theiler-Hedtrich |
| Abstract:
In the second part results of bacterial canker resistance test are presented. Tests were carried out by leaf scar and bark inoculation on seedlings and bark inoculation on cultivars from the first test period (1969–1979) of the first breeding cycle (Theiler-Hedtrich, 1984). Of 1200 tested seedlings only 12 were highly resistent after bark inoculation tests in two successive years. Of the 29 cultivars tested only four showed moderate to high resistance whereas all others were highly susceptible to bacterial canker. Of the highly resistent cultivars, Vittoria was best in two successive years. According to the susceptibility of the parent plants their progenies were analysed for their resistance to bacterial canker, confirming results from Matthews (1973). In the new breeding cycle crosses were made with cultivars of low fruit removal forces to breed varieties which are easy to mechanical harvest, combined with bacterial canker resistance. In addition self fertility was included in the breeding programme by using Stella self fertile as a pollinator. Growth vigour and the occurence of genetic dwarfs in progenies from specific crosses depended on the parent plants used. | |
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