Maize Lethal Necrosis disease (MLND): co-infection of maize plants with Maize Chlorotic Mottle virus (MCMV) and a Potyvirus, usually SCMV (Sugarcane Mosaic virus), and/or MaYMV (Maize Yellow Mosaic virus) or MATV (Maize-Associated Totivirus)
If you are interested, see information about any of these viruses.