Mendoza-Churape Juan, Lara-Chávez Ma Blanca Nieves, Ramírez-Mendoza Rosario, Martínez-González César Ramiro, Contreras-Cornejo Hexon Angel, Raya-Montaño Yurixhi Atenea, Ávila-Val Teresita Del Carmen, Vargas-Sandoval Margarita
Laboratorio de Fitopatología, Facultad de Agrobiología "Presidente Juárez", Universidad Michoacana de San Nicolás de Hidalgo, Uruapan 60170, Michoacán, Mexico.
Colegio de Postgraduados, Km 36.5 Montecillo, Texcoco 56230, Estado de México, Mexico.
Pathogens. 2025 May 26;14(6):532. doi: 10.3390/pathogens14060532.
México is the world's leading producer of avocado, with 2,540,715 tons in the last year. spp. are macromycete fungi that rot wood. In 2022, in the state of Michoacán, México, sporomas of sp. were found in the trunks of avocado trees ( var. Hass) of 10 years old and older. The trees showed disease symptoms including yellowing of leaves, widespread defoliation, and wilting. It was observed that 10% of the infected trees were felled after heavy rains. In the place where the fungus settled, abundant cream-colored and cottony mycelium developed, causing "white rot". The incidence of the disease in the sampled orchards was 60% in the tree population per hectare with 350 trees. The symptomatic trees studied were randomly selected from seven orchards. The collected fungal samples show typical structures corresponding to sp., including large sporomas, a pileus with a surface of concentric zones of various ocher tones, and a porous hymenium. The samples showed a 99% match with the species . Laboratory bioassays of inoculation in fresh wood segments of avocado formed typical sporomas of the pathogen. Finally, the fungus was recovered and reisolated in vitro in PDA, and its identity was confirmed through the morphological characteristics and molecular tests. To the best of our knowledge, this article reports for the first time that cv. Hass and Mendez are new hosts for . Therefore, the environmental and horticultural management conditions that favor the proliferation of must be investigated.
墨西哥是世界上最大的鳄梨生产国，去年产量达2540715吨。[具体真菌名称未给出] spp. 是会使木材腐烂的大型真菌。2022年，在墨西哥米却肯州，在树龄10年及以上的鳄梨树（哈斯变种）树干上发现了[具体真菌名称未给出] sp. 的子实体。这些树出现了病害症状，包括叶片发黄、普遍落叶和枯萎。据观察，10% 受感染的树木在大雨后被砍伐。在真菌定居的地方，形成了大量奶油色且呈棉絮状的菌丝体，导致“白腐病”。在每公顷种植350棵树的抽样果园中，该病的发病率为60%。所研究的有症状的树木是从七个果园中随机选取的。采集的真菌样本显示出与[具体真菌名称未给出] sp. 相对应的典型结构，包括大型子实体、菌盖表面有各种赭色同心带，以及多孔的子实层。样本与[具体真菌名称未给出]物种的匹配度为99%。在鳄梨新鲜木段上进行接种的实验室生物测定形成了病原体的典型子实体。最后，该真菌在马铃薯葡萄糖琼脂（PDA）培养基中体外复苏并重新分离，通过形态特征和分子测试确认了其身份。据我们所知，本文首次报道哈斯变种和门德斯变种是[具体真菌名称未给出]的新宿主。因此，必须研究有利于[具体真菌名称未给出]繁殖的环境和园艺管理条件。
