First report of powdery mildew caused by Erysiphe cruciferarum on Indian mustard (Brassica juncea) in Korea.

摘要

In May 2011, plants of Indian mustard cv. Cheong-Kyeoja, growing in polyethylene-film-covered greenhouses in Hwaseong, Korea, were observed to be affected by a powdery mildew. Symptoms appeared as circular to irregular white colonies, which subsequently showed abundant hyphal growth on both leaf surfaces. Severely infected plants were unmarketable due to leaf discoloration, and most were not harvested. Based on morphological characteristics, sequence analysis of the rDNA internal transcribed spacer region and a pathogenicity test, the causal agent was identified as E. cruciferarum. There are records of E. cruciferarum infecting B. juncea in Europe (Finland, Romania, Sweden, Switzerland), the former Soviet Union, Australia, South Africa, and Asia (India, Japan, and China). This is thought to be the first report of powdery mildew caused by E. cruciferarum on B. juncea in Korea.Digital Object Identifier http://dx.doi.org/10.1094/PDIS-04-13-0378-PDN