First report of Talaromyces verruculosus causing storage rot of groundnut in Mexico.
In Mexico, 59 324 hectares of groundnuts are cultivated annually. During September 2017, rot symptoms were detected in stored seeds of groundnut cv. Creole in the municipality of Iguala, Guerrero state. The average incidence of disease was 12% from eight sampled stores. The symptoms were characterized by the presence of necrotic lesions and cracking, often covered with masses of off-white to light green spores. One hundred groundnut seeds with symptoms of the fungus were collected. Based on morphological observations, DNA sequencing and pathogenicity tests, the causal agent was identified as T. verruculosus. This fungus has previously been isolated from groundnut seed in the USA, but this is thought to be the first report of T. verruculosus causing storage rot of groundnut seed in Mexico. The disease can cause large losses of yield and quality of fruits in stored groundnuts, besides the risk to consumer health due to mycotoxin production by this pathogen.