Colletotrichum siamense Causing Leaf Spot on Black Olive (Bucida buceras) in Mexico

ABSTRACT During the summer of 2019, spots were detected on the leaves of black olive ( Bucida buceras L.) trees distributed in urban areas in Los Mochis, Sinaloa, Mexico. Two single‐spore isolates were obtained and identified as Colletotrichum siamense by phylogenetic analyses of concatenated sequences of the ITS, gapdh , tub2 , act , chs‐1 and gs genes. The pathogenicity of the isolates was demonstrated through inoculations under controlled conditions. This is the first report of C. siamense causing leaf spot of black olive in Mexico and worldwide.