The first report of Calonectria pteridis causing a leaf spot disease on Serenoa repens in China.
Serenoa repens is an important medicinal plant with their extracts is one of the three most effective drugs to cure benign prostatic hyperplasia. Also, it can be used as an ornamental plant for garden. In November 2010, a new leaf spot disease was found on S. repens in Danzhou, Hainan Province, China. Disease occurred very seriously, with the incidence close or up to 100%, even leading to plant drying and death. Initially, the leaves had circular water-soaked dots, and had an obvious yellow halo on the edge, then expanded into oval, circular, or irregular shaped spots. Eventually the spot was beige and gray in the centre and dark brown and slightly concave on the edge. Based on morphological characteristics, molecular investigations (sequence analysis of the rDNA internal transcribed spacer region and translation elongation factor 1-alpha gene) and pathogenicity tests, the causal agent was identified as C. pteridis. This is thought to be the first report of leaf spot caused by C. pteridis on S. repens in China.