Beta vulgaris mitovirus 1 in diverse cultivars of beet and chard.

•Previous recent results indicate that mitoviruses infect plants as well as fungi.•Here we report coding sequences for 42 further strains of Beta vulgaris mitovirus 1.•The strains derive from diverse crop types of B. vulgaris as well as wild sea beet.•Strains from cultivars with “Owen” mitochondria form a compact monophyletic cluster.