Vol. 61 No. 1 (2022)
Articles

Identity and pathogenicity of Botryosphaeriaceae and Diaporthaceae from Juglans regia in Chile

Israel Jimenez Luna
Botany and Plant Sciences Department, University of California, Riverside, CA
Ximena Besoain
Escuela de Agronomía, Pontificia Universidad Católica de Valparaíso
Sebastian Saa
Almond Board of California, Modesto, CA
Elena Peach-Fine
School of Engineering and Computer Science, University of the Pacific, Stockton, CA
Fabiola Cadiz Morales
Escuela de Agronomía, Pontificia Universidad Católica de Valparaíso
Natalia Riquelme
Escuela de Agronomía, Pontificia Universidad Católica de Valparaíso
Alejandra Larach
Escuela de Agronomía, Pontificia Universidad Católica de Valparaíso
Javiera Morales
Escuela de Agronomía, Pontificia Universidad Católica de Valparaíso
Exequiel Ezcurra
Botany and Plant Sciences Department, University of California, Riverside, CA
Vanessa E.T.M. Ashworth
Botany and Plant Sciences Department, University of California, Riverside, CA
Philippe E. Rolshausen
Botany and Plant Sciences Department, University of California, Riverside, CA
Published March 25, 2022
Keywords
  • Diaporthe,
  • Diplodia,
  • Neofusicoccum,
  • walnut,
  • wood canker,
  • host range
  • ...More
    Less
How to Cite
[1]
I. Jimenez Luna, “Identity and pathogenicity of Botryosphaeriaceae and Diaporthaceae from Juglans regia in Chile”, Phytopathol. Mediterr., vol. 61, no. 1, pp. 79-94, Mar. 2022.

Abstract

English walnut (Juglans regia) has become an important crop in Chile, representing 11.5% of the total area of fruit trees, surpassed only by grapevine. As the Chilean walnut industry rapidly expands, young orchards are at risk from the emergence of new fungal diseases. Botryosphaeriaceae and Diaporthaceae fungi have been recognized as main causes of wood diseases in walnut, with symptoms of dieback, canker, and blight. In winter 2017, samples were collected from different orchards in Valparaíso and Maule regions. Fungal isolates recovered were cultured, characterized morphologically, and identified using DNA sequence analyses. Three species (Neofusicoccum parvum, Diplodia mutila, Diplodia seriata) were characterized in Botryosphaeriaceae and two (Diaporthe cynaroidis, Diaporthe australafricana) in Diaporthaceae. Pathogenicity tests showed that N. parvum was the most aggressive species to walnut. This study confirmed the presence of pathogenic Botryosphaeriaceae and Diaporthaceae in J. regia that should be considered an increasing risk for the growing Chilean walnut industry.

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