Resumo

POLANCO FLORIAN, Laura Glenys et al. Fungi associated with the regressive death of citrus fruits in Nuevo Leon and Tamaulipas, Mexico. Rev. Mex. Cienc. Agríc [online]. 2019, vol.10, n.4, pp.757-764.  Epub 22-Maio-2020. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v10i4.1417.

The cultivation of citrus fruits is affected by several phytopathogenic fungi, which can cause diseases and reduce their production. The fungus Lasiodiplodia spp. causes regressive death and other symptoms in citrus and other crops in various countries, including Mexico. The objective of this work was to identify isolated fungal strains of citrus trees with symptoms of regressive death and to evaluate their pathogenicity in greenhouse conditions. The isolated fungi were identified based on their morphological characteristics such as Lasiodiplodia theobromae, Fomitopsis meliae and Eutypella citricola, confirmed with PCR amplification and sequencing of the ITS region when compared to the GenBank sequences. In the greenhouse bioassay, it was found that L. theobromae and F. meliae cause symptoms of wilting, descending death and necrotic lesions in the inoculated areas from the fourth day after inoculation in plants of sweet orange variety Valencia. F. meliae + L. theobromae caused more severe damage, causing necrotic lesions of 22 to 27 cm in length, wilt and regressive death and both were reisolated from the lesions produced. E. citricola only produced necrosis around the inoculated area. According to the results of the pathogenicity test, fungi L. theobromae and F. meliae cause regressive citrus death.

Palavras-chave : Lasiodiplodia; pathogenicity; phytopathogenic fungi.

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