Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of leaf spot caused by Zasmidium lythri on Lythrum salicaria in Korea.

Abstract

Although Lythrum salicaria is regarded as an invasive species in New Zealand and North America, it is generally grown for ornamental purposes in wet places. In September 2009, leaves of L. salicaria plants grown in a pond edge in Suwon, Korea, were found to have turned reddish and fallen prematurely. Infected leaves exhibited angular leaf spots on the lower leaf surface, sometimes covering almost the whole leaf surface and causing a reddening of the upper surface. The same symptoms were also found in Pocheon and Hongcheon, Korea, during our extensive surveys of phytopathogenic fungi in 2009-14. Based on morphological characteristics, sequence analysis of the rDNA internal transcribed spacer region and pathogenicity test, the causal agent was identified as Z. lythri. A leaf spot disease of L. salicaria associated with Z. lythri has been reported in Belgium, Bulgaria, England, Germany, Poland and Spain. This is thought to be the first report of Z. lythri causing angular leaf spots on L. salicaria in Asia as well as in Korea.