Leaf Spot Disease Caused by Phyllosticta capitalensis on Mango in Guangxi, China

作者：Sifan Zhao, Qili Li, Suiping Huang, Xiaolin Chen, Yu Zhang, Li W, Lihua Tang · 发表于：Plant Disease · 年份：2025 · DOI：10.1094/pdis-05-25-0951-pdn · 被引用次数：1 · 研究领域：Plant Pathogens and Fungal Diseases、Phytoplasmas and Hemiptera pathogens、Forest Insect Ecology and Management

Mango (Mangifera indica L.), tropical fruit renowned for its rich flavor and nutritional benefits, is extensively cultivated in southern China (Wang et al. 2023). In July 2023, leaf spots were observed in a mango plantation located in Tianyang, Guangxi, China (106°22'-107°09'E, 23°29'-24°07'N), with ~20% incidence across surveyed fields. Affected leaves exhibited 20-80% necrotic coverage, with subcircular or irregular yellowish-brown lesions gradually expanding into brown irregular areas surrounded by yellow halos. Symptomatic leaves were collected from three orchards, and 5 × 5 mm sections were excised from lesion margins and surface sterilized by immersion in 75% ethanol for 15 s and 2% sodium hypochlorite for 1 min, followed by three sterile distilled water rinses. Disinfected tissues were placed on potato dextrose agar (PDA) and incubated at 28°C under 12-h photoperiod cycles for 5 days. A total of 75 morphologically similar isolates were obtained, and three representative strains (TY6-1, TY8-1, TY9-1) were selected for characterization. Colonies displayed dark green pigmentation with granular textures and irregular white margins. Conidiomata were black, immersed or semi-immersed, subglobose to ellipsoidal, solitary or aggregated on the stroma, with circular ostioles. Conidiogenous cells appeared stick-shaped with apical constrictions, producing hyaline, unicellular, ovoid or subglobose conidia (6.0-8.5 × 8.5-13.3 μm; n=90) bearing single apical appendages. Morphological ...