- M. Ghasemkhani (3)
- M. Lateur (2)
- H. Nybom (1)
- F. Odilbekov (1)
- I. Samashko (1)
- W.E. Weg van de (2)
- E. Weg van de (1)
- M. Wenneker (1)
- J. Willforss (1)
- A. Zborowska (2)
- T. Zhebentyayeva (1)
Phenotyping of resistance to European canker across genetically diverse germplasm
Garkava-Gustavsson, L. ; Zborowska, A. ; Dörre, M. ; Ghasemkhani, M. ; Wenneker, M. ; Englund, J.E. ; Lateur, M. ; Weg, W.E. van de - \ 2017
In: Abstracts of the Third International Workshop on Apple Canker and Replant Disease. - - p. 15 - 15.
Responses to Neonectria ditissima infection in apple: what do expression studies on partially resistant and susceptible cultivars tell us?
Garkava-Gustavsson, L. ; Ghasemkhani, M. ; Odilbekov, F. ; Dörre, M. ; Samashko, I. ; Canbäck, B. ; Willforss, J. ; Alexandersson, E. ; Nybom, H. ; Weg, W.E. van de; Zhebentyayeva, T. - \ 2017
In: Abstracts of the Third International Workshop on Apple Canker and Replant Disease. - - p. 19 - 19.
Approaches for evaluation of resistance to European canker (Neonectria ditissima) in apple
Garkava-Gustavsson, L. ; Ghasemkhani, M. ; Zborowska, A. ; Englund, J.E. ; Lateur, M. ; Weg, E. van de - \ 2016
Acta Horticulturae 1127 (2016). - ISSN 0567-7572 - p. 75 - 81.
Disease resistance - Fruit tree canker - Malus × domestica - Nectria galligena - Phenotyping - Susceptibility
European canker is caused by the fungus Neonectria ditissima (Neonectria galligena, formerly Nectria galligena). The disease causes significant losses to apple production in Sweden and many other countries with a temperate wet climate. Application of fungicides and good horticultural practices do not prevent canker damage in nurseries and orchards. Disease outbreaks damage and even completely destroy trees. To date, complete resistance to N. ditissima is not known in apple, but cultivars differ considerably in their level of partial resistance. To be able to conduct breeding for resistance to European canker, reliable plant tests are urgently needed. Differences in resistance to N. ditissima (colonization rate; CR) in apple cultivars were evaluated by wound inoculations with a standardized number of conidia on cut shoots from mature trees placed in a climate chamber and on potted trees in an unheated greenhouse. Infection percentage (Inf%) was assessed by 'natural' inoculations in leaf scars under high infection pressure in the field. All the experiments were carried out over 2 years. Lengths of lesions were measured at regular time intervals on five occasions for shoots and seven occasions for trees. Considerable differences in CR and Inf% were found among the cultivars. The relative levels of resistance obtained are consistent with previous reports for most cultivars. Assessment of CR (area under curve) and Inf% thus proved to be useful tools for evaluation of resistance to European canker. Also, some potentially new sources of resistance were identified.