Northern leaf blight (NLB) caused by Exserohilum turcicum and southern leaf blight (SLB) caused by Cochliobolus heterostrophus are devastating foliar diseases of maize. Although many quantitative trait loci (QTL) associated with NLB and SLB resistance have been identified, only a few have been validated and fine-mapped. Here, a recombinant inbred line (RIL) population consisting of 209 F 6:7 families was generated from a cross between the resistant line KB020 and the susceptible line PH4CV. Both