Abstract

Leaf spot on lemon balm is frequently observed in Korea, causing considerable damage to crops. In 2014 and 2015, the occurrence of leaf spot was observed in several production greenhouses at Suwon, Gongju, and Namwon in Korea. Symptoms on lower leaves initially developed as small, distinct, discolored lesions, which enlarged progressively turning into dark brown, angular spots surrounded by purplish-brown margins. Based on the morphological characteristics and sequence analysis of actin (ACT), translation elongation factor 1-alpha (EF-1α), internal transcribed spacer (ITS), 28S nrDNA (LSU), and RNA polymerase II second largest subunit (RPB2), the fungus associated with the lemon balm leaf spot was determined as Septoria melissae. To the best of our knowledge, this is the first report of lemon balm leaf spot caused by S. melissae in Asia as well as in Korea.

摘要

在韩国经常观察到柠檬香膏上的叶斑，对农作物造成相当大的损害。2014年和2015年，在韩国水原，公州和南原的数个生产温室中均观察到了叶斑病的发生。下叶的症状最初发展为小的，明显的，变色的病灶，逐渐扩大成深褐色的棱角斑点，周围被紫褐色的边缘包围。基于肌动蛋白（ACT），翻译延伸因子1-alpha（EF-1α），内部转录间隔区（ITS），28S nrDNA（LSU）和RNA聚合酶II第二大亚基（RPB2）的形态特征和序列分析，与柠檬香脂叶斑有关的真菌被确定为Septoria melissae。据我们所知，这是亚洲和韩国由S. melissae引起的柠檬香脂叶斑的首次报道。