Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Armillaria root disease caused by Armillaria ostoyae on Japanese larch (Larix kaempferi) and Eastern white pine (Pinus strobus) in South Korea.

Abstract

Over 1.0% mortality of Japanese larch (Larix kaempferi) and Eastern white pine (Pinus strobus) was found in plantations located in Gangwon Province, Korea Republic, in August 2014. Recently dead trees were 18-19 years old and suspected of being killed by Armillaria root disease. Disease symptoms and signs included thinning crowns, mycelial fans beneath the bark and on the roots and rhizomorphs at the tree bases under the ground, but no basidiocarps were formed. The causal pathogen was identified as Armillaria ostoyae based on various molecular analyses (ITS, BLAST and PCR). This is thought to be the first report of Armillaria root disease caused by A. ostoyae on Japanese larch and Eastern white pine in Korea Republic.