RESISTANCE TESTS IN SWEET CHERRIES
With the aim to find resistant cultivars for breeding and for farming the collection of sweet cherry cultivars of the Fruit Genebank Dresden-Pillnitz was tested for resistance to Cytospora spec. (Valsa), Pseudomonas spec. and frost.
Common laboratory test methods were improved and methods for comprehensive serial testing were developed.
The ranking of susceptibility of the sweet cherry cultivars was confirmed by field observation.
A relatively high variation of the results should always be expected as they are influenced by many factors which can not be standardized.
Only the extremely resistant or susceptible cultivars can be identified without fail. - After artificial infestation of scions we found the cultivars 'Burlat', 'Bianca', 'Nalina', 'Nadino', 'Valerij Tschkalov' and the Pillnitz /Naumburg breeding clone Pi-Na 45 as low susceptible for Valsa. The same collection was tested for resistance to Pseudomonas spec Cvs. 'Altenburger Melonenkirsche', 'Querfurter Königskirsche', the Russian cultivar 'Vinka' and the clones Pi-Na 29, 45 and 481 had a low susceptibility to bacterial cancer. - The winter frost resistance, including the sensitivity of flower buds in the early stage, was tested by a standardized laboratory method for scions in a refrigerator and evaluation of frost damages of bark, cambium, flower and leaf buds.
The cvs. 'Naresa', 'Van' and 'Nalina' showed the best evaluation marks.
A relationship between frost, Valsa (Cytospora sp.) and Pseudomonas resistances was not found.
Each of the properties should be tested separately.
Maybe, their heredity is also independent. - No cultivar was found with positive evaluations only.
Fischer, M. and Hohlfeld, B. (1998). RESISTANCE TESTS IN SWEET CHERRIES. Acta Hortic. 468, 87-96
DOI: 10.17660/ActaHortic.1998.468.8
https://doi.org/10.17660/ActaHortic.1998.468.8
DOI: 10.17660/ActaHortic.1998.468.8
https://doi.org/10.17660/ActaHortic.1998.468.8
Sweet cherry cultivars, resistance to Cytospora, Pseudomonas and frost, test methods