Abstract
In October 2018, collar rots were observed on seedlings of Gynura formosana in Taiwan. The causal agent was identified as Phytophthora drechsleri based on the morphological and molecular characteristics. Pathogenicity tests demonstrated that the isolate is pathogenic to G. formosana and G. bicolor. To our knowledge, this is the first report of G. formosana as a host of P. drechsleri.
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