Vol. 63 No. 3 (2024)
Articles

Pseudothecium development and ascospore discharge in Venturia asperata and V. inaequalis: relation to environmental triggers

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  • Daniele PRODORUTTI,
  • Valeria GUALANDRI,
  • Vincent PHILION,
  • Arne STENSVAND,
  • Emanuela COLLER,
  • Ilaria PERTOT
Daniele PRODORUTTI
Fondazione Edmund Mach, via Mach 1, 38098 San Michele all’Adige, TN, Italy
Valeria GUALANDRI
Fondazione Edmund Mach, via Mach 1, 38098 San Michele all’Adige, TN, Italy
Vincent PHILION
Institut de Recherche et de Développement en Agroenvironnement, IRDA, Saint-Bruno-de-Montarville, Québec, Canada
Arne STENSVAND
Norwegian Institute of Bioeconomy Research (NIBIO), P.O. Box 115, NO-1431 Ås, Norway
Emanuela COLLER
Fondazione Edmund Mach, via Mach 1, 38098 San Michele all’Adige, TN, Italy
Ilaria PERTOT
Fondazione Edmund Mach, via Mach 1, 38098 San Michele all’Adige, TN, Italy
DOI: https://doi.org/10.36253/phyto-15739

Published 2024-12-30

Keywords

  • Apple scab,
  • disease management,
  • epidemiology,
  • light,
  • resistant cultivars

How to Cite

[1]
D. PRODORUTTI, V. GUALANDRI, V. PHILION, A. STENSVAND, E. COLLER, and I. PERTOT, “Pseudothecium development and ascospore discharge in Venturia asperata and V. inaequalis: relation to environmental triggers”, Phytopathol. Mediterr., vol. 63, no. 3, pp. 431–442, Dec. 2024.

Copyright (c) 2024 Daniele PRODORUTTI, Valeria GUALANDRI, Vincent PHILION, Arne STENSVAND, Emanuela COLLER, Ilaria PERTOT

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

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Abstract

Venturia asperata (Ascomycetes) was first described in 1975, as a saprotroph on overwintered apple leaf litter, and then, in 2007, as the cause of atypical apple scab symptoms on scab-resistant apple cultivars in southern France, and later in northern Italy and China. Information on V. asperata is limited. This study expanded knowledge by comparing development of pseudothecia and ascospore discharge in V. asperata and V. inaequalis. Leaf litters with pseudothecia of V. asperata or V. inaequalis were prepared, and a spore trap was placed above each litter. Over the 2-year study, pseudothecia of the two pathogens developed differently: V. asperata had delayed pseudothecium maturation and emptying in relation to degree day accumulation, compared to V. inaequalis. The ascospore release for V. asperata was also delayed, commencing and ending later than V. inaequalis. The delayed spore ejection and pseudothecium development of V. asperata compared to V. inaequalis may partly explain the late onset of symptoms in orchards during each growing season. These results have implications for plant protection strategies on scab-resistant apple cultivars, in particular under warm climates that occur in the Mediterranean region.

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