Department of Plant Pathology, University of Agricultural Sciences, GKVK, Bangalore, Karnataka 560065, India.
Department of Plant Pathology, Punjab Agricultural University, Ludhiana, Punjab, 141004, India.
Microb Pathog. 2024 Nov;196:106938. doi: 10.1016/j.micpath.2024.106938. Epub 2024 Sep 12.
Dypsis lutescens, commonly known as areca palm, is a highly valued ornamental species due to its aesthetic value. However, the foliage is vulnerable to various pathogens, particularly those responsible for fungal leaf spot diseases. In October 2023, a severe incidence (93 %) of destructive leaf spots was recorded on Dypsis lutescens at the University of Agricultural Sciences, GKVK, Bangalore, and surrounding areas. The leaf spot symptoms manifested as frog-eye-like lesions, leading to complete leaf desiccation and significantly reducing the palms ornamental value. The pathogen exhibited the highest radial growth (90.00 mm) and prominent sporulation on oat meal agar, whereas Richard's synthetic agar resulted in the lowest radial growth (38.00 mm) with no sporulation. Morphological and multilocus phylogenetic analyses confirmed the pathogen as Bipolaris heliconiae. Pathogenicity tests fulfilled Koch's postulates, confirming that Bipolaris heliconiae is the causative agent of leaf spot disease in Dypsis lutescens in India. This novel finding underscores the emergence of a new disease and highlights the urgent need for effective management strategies.
黄椰子，俗称槟榔树，因其具有美学价值而成为一种极具价值的观赏物种。然而，其叶片易受多种病原体的侵害，尤其是那些导致真菌性叶斑病的病原体。2023 年 10 月，班加罗尔农业科学大学（GKVK）及其周边地区的黄椰子遭受了严重的破坏性叶斑病（93%）。叶斑病症状表现为蛙眼状病斑，导致叶片完全干枯，严重降低了棕榈树的观赏价值。该病原体在燕麦琼脂上表现出最高的径向生长（90.00mm）和明显的产孢，而理查德合成琼脂则导致最低的径向生长（38.00mm）和无产孢。形态学和多位点系统发育分析证实该病原体为旋孢腔菌。致病性试验满足柯赫氏假设，证实旋孢腔菌是印度黄椰子叶斑病的病原体。这一新发现突显了一种新疾病的出现，并强调了迫切需要制定有效的管理策略。
