Characterization of oomycete species associated with root and crown rot of english walnut in Chile

Jeannette Guajardo, Sebastián Saa, Natalia Riquelme, Gregory Browne, Cristian Youlton, Mónica Castro, Ximena Besoain

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

5 Citas (Scopus)


English (Persian) walnut (Juglans regia) trees affected by root and crown rot were surveyed in five regions of central Chile between 2015 and 2017. In each region, nine orchards, ranging from 1 to 21 years old, were randomly selected and inspected for incidence and severity of tree decline associated with crown and root rot. Soil and symptomatic crown and root tissues were collected and cultured in P5ARP semiselective medium to isolate potential oomycete pathogens, which were identified through morphology and molecularly using ITS sequences in the rDNA gene and beta tubulin gene. The most frequently isolated species was Phytophthora cinnamomi. Pathogenicity tests were conducted with representative oomycete isolates. P. cinnamomi, P. citrophthora, and Pythium ultimum were all pathogenic in J. regia. Nevertheless, only P. cinnamomi and P. citrophthora were pathogenic to English walnut. Py. ultimum caused limited levels of root damage to English walnut seedlings. Our research indicates that as the Chilean walnut industry has expanded, so have walnut crown and root rots induced by oomycetes.

Idioma originalInglés
Páginas (desde-hasta)691-696
Número de páginas6
PublicaciónPlant Disease
EstadoPublicada - abr. 2019


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