First report of leaf spot on radix asteris (Aster tataricus) caused by Colletotrichum destructivum in China.
In 2014 and 2015, dark brown lesions were observed on leaves of Aster tataricus plants in Changchun, Jilin Province, China. The disease incidence reached approximately 30%. Symptoms on diseased leaves initially included small, light brown and circular spots. As the disease progressed, small circular spots expanded and gradually became round or irregular and the spots turned grey in the centre with dark brown margins, frequently surrounded by light yellow haloes. Eventually, the necrotic areas often coalesced and resulted in the appearance of larger spots with a diameter of 4.0 to 15.0 mm. Severely affected leaves often withered and died. The causal pathogen was isolated and identified as Colletotrichum destructivum based on morphological, molecular and pathogenicity analyses. This is thought to be the first report of C. destructivum causing anthracnose on A. tataricus.