First report of Phytophthora hydropathica causing wilting and shoot dieback on Viburnum in Italy.
In autumn 2012, a survey was conducted to determine the presence of Phytophthora ramorum on Viburnum in commercial nurseries in Latium, Italy, where wilting, dieback, and death of twigs were observed on 30% of the Laurustinus (Viburnum tinus) plants. A Phytophthora species was consistently recovered from soil rich in feeder roots from potted Laurustinus plants showing symptoms. Based on morphological characteristics, molecular investigations (sequence analysis of the rDNA internal transcribed spacer region and mitochondrial partial cytochrome oxidase subunit 2) and pathogenicity tests, the causal agent was identified as P. hydropathica. This is thought to be the first report of P. hydropathica causing wilting and shoot dieback on V. tinus.