First Report of Root Rot Caused by <i>Phytophthora bilorbang</i> on <i>Olea europaea</i> in Italy
2020
Elena Santilli | Mario Riolo | Federico La Spada | Antonella Pane | Santa Olga Cacciola
Leaf chlorosis, severe defoliation and wilt associated with root rot were observed on mature olive trees cv. Nera di Gonnos in an experimental orchard at Mirto Crosia (Calabria, southern Italy). An oomycete was consistently isolated from rotten roots of symptomatic olive trees. It was identified as <i>Phytophthora bilorbang</i> by morphological characters and sequencing of Internal Transcribed Spacer (ITS) regions of ribosomal DNA (rDNA). Pathogenicity was verified by inoculating potted two-month-old rooted cuttings of <i>Olea europaea</i> var. Nera di Gonnos in a soil infestation trial. <i>P. bilorbang</i> was re-isolated from roots of symptomatic, artificially inoculated olive cuttings to fulfill Koch’s postulates. This is the first report of <i>P. bilorbang</i> on <i>O. europaea</i> L. and on a species of the Oleaceae family worldwide.
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