First report of Maize chlorotic mottle virus and maize lethal necrosis on maize in Ethiopia.
In July 2014, maize plants exhibiting severe yellowing and chlorotic mottle symptoms were observed in the Upper Awash Valley of Ethiopia. From a survey of 12 farms in the Central Rift Valley, 126 samples were collected from maize (100 samples) and other grass species (26 samples, including Sorghum halepense, Elymus repens, unidentified grass species, Digitaria sp., sedge, sorghum, Setaria spp. and sugarcane), and either with symptoms or without virus symptoms. Samples were analysed and the causal pathogen was identified as Maize chlorotic mottle virus (MCMV) based on genetic and pathogenicity analyses. This is thought to be the first report of MCMV and maize lethal necrosis on maize in Ethiopia as well as in some alternate Poaeceae hosts.