Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Phytophthora cinnamomi causing basal stem blight and root rot of Hypericum formosum in Taiwan.

Abstract

In the spring of 2005, a severe disease was observed on Hypericum formosum in several gardens at Chiayi, Taiwan. Infected plants showed symptoms of leaf drooping initially, resulting in severe wilting and plant death in 1-2 weeks. The internal tissues of infected basal stems turned dark brown in early disease development and rotted completely later. Infected roots showed symptoms of necrosis. The causal pathogen was identified as Phytophthora cinnamomi based on morphological, genetic (ITS) and pathogenicity analyses. This is thought to be the first report of P. cinnamomi on H. formosum in Taiwan.