Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Wilsoniana bliti causing white blister rust disease on Amaranthus blitum in Korea.

Abstract

Amaranthus blitum (Amaranthaceae), often called purple amaranth, is a cosmopolitan weed, spreading from tropic to temperate areas. In Korea, the plant was introduced as an exotic plant but currently is cultivated as an alternative leafy vegetable with high potential for commercial production. In October of 2019, symptoms of white blister rust were found in A. blitum farmland of Jeongeup, Korea, with a disease incidence of 60%. Symptoms appeared as light-green chlorotic spots on the upper surface of the leaves. Blister sori formed on the corresponding lower surface were white, oval to ellipsoidal, and 3 to 4 mm in diameter. Based on morphological characteristics, sequencing data and pathogenicity test, the Korean agent was identified as Wilsoniana bliti (= Albugo bliti). This is thought to be the first report of white blister rust caused by W. bliti on A. blitum in Korea.