First report of Hop stunt viroid from sweet cherry with dapple fruit symptoms in China.
In May 2010, sweet cherry cv. Red-lamp trees exhibiting dapple fruit disease were observed in a suburban orchard in Tai'an, Shandong Province, China. Following grafting of scions from the diseased trees onto healthy trees, dapple fruit symptoms developed in fruits of grafted trees 2-3 years post grafting. Samples were collected from 15 dapple fruit and 10 symptomless fruit trees. The causal pathogen was identified as Hop stunt viroid (HSVd) based on molecular and pathogenicity analyses. This is thought to be the first report of HSVd-infected sweet cherry trees in China.