First Report of Muskmelon Fruit Rot Caused by Fusarium nanum in China

作者：X. P. Zhang, Q. Q. Dang, Xiaodong Cao, Y. G. Liu, Z. B. Bi, Xiaoping Zhu, Ji-Wen Xia · 发表于：Plant Disease · 年份：2022 · DOI：10.1094/pdis-04-22-0965-pdn · 被引用次数：7 · 研究领域：Plant Pathogens and Fungal Diseases、Mycorrhizal Fungi and Plant Interactions、Plant-Microbe Interactions and Immunity

Muskmelon (Cucumis melo L.) is one of the most widely cultivated and economically important fruit crops in the world. However, many pathogens can cause decay of muskmelon fruit, including Fusarium asiaticum, F. equiseti, F. incarnatum and F. lateritium (Hao et al. 2021; Wang et al. 2019). Fusarium spp. are the most important pathogens affecting muskmelon fruit yield and quality (Wang et al. 2011). In August 2020, fruit rot symptoms were observed on ripening muskmelons (cv. Tianbao) in several fields in Jiyang District, Jinan City of Shandong Province, China. The incidences of infected muskmelon ranged from 15% to 30% and caused an average 20% yield loss. Symptoms appeared as pale brown, water-soaked lesions that were irregular in shape, with the lesion sizes ranging from a small spot (1 to 2 cm) to decay of the entire fruit. The core and surface of infected fruit were colonized and covered with white mycelia. Two infected muskmelons were collected from two fields, 7 km apart. Tissues removed from inside the infected fruit were surface disinfected with 75% ethanol for 30 s, and cultured on potato dextrose agar (PDA) at 25°C in the dark for 5 days. Four purified cultures were obtained using the single spore method. On carnation leaf agar (CLA), macroconidia were 1 to 5 septate, falcate, with a pronounced dorsiventral curvature with blunt to papillate apical cell, and barely to distinctly notched basal cell, measuring 12 to 35 × 3.5 to 6 μm. Microconidia and chlamydospores were ...