Vol. 60 No. 3 (2021)
Articles

Leaf anthracnose and defoliation of blueberry caused by Colletotrichum helleniense in Northern Italy

Vladimiro Guarnaccia
Department of Agricultural, Forest and Food Sciences (DISAFA), University of Torino, Largo Braccini 2, 10095 Grugliasco (TO)
ilaria Martino
Centre for Innovation in the Agro-Environmental Sector, AGROINNOVA, University of Torino, Largo Braccini 2, 10095 Grugliasco (TO)
Luca Brondino
Ortofruit Italia Soc. Agr. Coop. O.P., Via Colombaro dei Rossi 16/bis, 12037 Saluzzo (CN)
Angelo Garibaldi
Centre for Innovation in the Agro-Environmental Sector, AGROINNOVA, University of Torino, Largo Braccini 2, 10095 Grugliasco (TO)
Maria Lodovica Gullino
Centre for Innovation in the Agro-Environmental Sector, AGROINNOVA, University of Torino, Largo Braccini 2, 10095 Grugliasco (TO)
Published December 30, 2021
Keywords
  • Vaccinium corymbosum,
  • multi-locus typing,
  • berry fruit
How to Cite
[1]
V. Guarnaccia, ilaria Martino, L. Brondino, A. Garibaldi, and M. L. Gullino, “Leaf anthracnose and defoliation of blueberry caused by Colletotrichum helleniense in Northern Italy”, Phytopathol. Mediterr., vol. 60, no. 3, pp. 479-491, Dec. 2021.

Abstract

Highbush blueberry is an increasingly important crop due to its economic value and demonstrated health benefits of blueberries. Leaf spots are considered as minor diseases of blueberry plants, but they adversely affect blueberry productivity, causing reduced photosynthetic activity, flower bud formation and berry production. Surveys of blueberry crops were conducted in Piedmont, Northern Italy, during 2019-2020. Fungi isolated from leaf spots of the blueberry cultivar ‘Blue Ribbon’ were identified as Colletotrichum helleniense through a robust multi-locus phylogeny. Eight genomic loci were considered: tub, gapdh, act, cal, his3, chs-1, ApMat and gs. Morphological characters of a representative strain were assessed. Pathogenicity was confirmed on four blueberry cultivars, although with different levels of aggressiveness to the cultivars. This study shows the importance of a polyphasic approach to investigate species of Colletotrichum, and the relevance of molecular tools for the species-level characterization within the ‘Kahawae’ clade. This is the first report of Colletotrichum helleniense causing leaf anthracnose on Vaccinium corymbosum.

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