Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of shoot canker on chestnut caused by Diaporthe nobilis in Shandong Province of China.

Abstract

In May 2015, for the first time, canker and severe twig dieback were observed in the Chinese chestnut (Castanea mollissima) orchards in Yantai, Shandong Province, China. The cankers appeared on shoots, twigs and branches with sunken reddish-brown/tan symptoms. The shoots died above the infected area when girdled. However, fruit rot was not observed. In later summer, numerous small black pycnidia were formed along the lenticels on the surface of diseased bark with curly slim and pale-yellow spore-tendrils being released from the pycnidia after rainfall. The causal pathogen was isolated and identified as Diaporthe nobilis based on morphological, molecular and pathogenicity analyses. The consensus sequences were deposited in GenBank (accession nos. MG920017 for ITS, MG926648 for CAL, MG926649 for TEF1, MG926650 for TUB and MG926651 for HIS). This is thought to be the first report of D. nobilis causing shoot canker and dieback on Chinese chestnut in China and even worldwide.