First report of leaf spot caused by Curvularia lunata on Plumeria rubra in Hainan, China.
In May 2013, a new leaf spot disease was recorded on Plumeria rubra in Danzhou and Haikou cities, Hainan, China. It seriously affected the yield and ornamental value of P. rubra. The incidence was 75%. The disease occurred in hot and humid weather, with temperatures ranging from 26 to 35°C, and humidity from 80 to 95%. Symptoms were evident on mature leaves, leading to premature defoliation. The infected leaves showed dark red, circular to irregular spots surrounded by a yellow halo. The lesions expanded and became dark brown, eventually causing yellowing of the leaves. The causal pathogen was identified as Cochliobolus lunatus based on morphological, molecular and pathogenicity analyses. This is thought to be the first report of leaf spot caused by C. lunatus on P. rubra in China.