First identification of Venturia asperata from atypical scab-like symptoms in Italian apple orchards
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Atypical scab symptoms were reported for the first time at the end of July in 2012 in Northern Italy (Cesena province, Emilia Romagna region) on fruit apple cultivar CIVG198 Modì® carrying the Rvi6 (=Vf) major resistance gene to Venturia inaequalis; it is a hybrid of ‘Gala’ x ‘Liberty’ with more than half the total world production area of cv ‘Modì’ located in Italy. The symptoms were also established in all the following years and Venturia asperata was identified as a causal agent of these atypical scab symptoms through morphological studies and molecular analysis of conidia from fruits and ascospores from overwintered leaves, using specific primers for V. asperata, V. inaequalis and V. pirina. Pathogenicity tests carried out on fruit at different phenological stages showed only light symptoms. Venturia asperata could represent an emergent disease for cv ‘Modì’ and disease control may be necessary.
KeywordsRvi6 ‘Modì’ Venturia inaequalis Venturia pirina
This study was (partially) funded by the LIFE financial instrument of the European Union (contract no. LIFE13 ENV/HR/000580). The authors are thankful for this financial support.
Compliance with ethical standards
Authors confirm that this study is original and has not been published previously, and is not under consideration for publication elsewhere. All authors have approved the manuscript and agree with submission to this journal. This research does not contain any conflict of interest, nor research involving humans or animals.
- Corlett, M. (1985). Venturia asperata. In M. Corlett, S. A. Redhead, G. P. White, et al. (Eds.), Fungi Canadenses (p. 291). Ottawa: Biosystematics Research Institute.Google Scholar
- Guerra, W. (2014). Le nuove varietà resistenti alla ticchiolatura. Frutticoltura, 11, 26–34.Google Scholar
- Holb, I. J. (2009). Fungal disease management in environmentally friendly apple production—A review. In: Climate change, intercropping, pest control and beneficial microorganisms. In E. Lichtfouse (Ed.), Sustainable agriculture reviews (Vol. 2, pp. 219–293). Dordrecht: Springer.Google Scholar
- Sivanesan, A. (1977). The taxonomy and pathology of Venturia species. Vaduz: Bibliotheca Mycologica.Google Scholar
- White, T. J., Bruns, T., Lee, S., & Taylor, J. (1990). Amplification and direct sequencing of fungal ribosomal RNA genes for phylogenetics. In M. A. Innis, D. H. Gelfand, J. J. Sninsky, & T. J. White (Eds.), PCR Protocols: A guide to methods and applications (pp. 315–322). San Diego: Academic Press.Google Scholar