Conventional breeding methods such as mutation breeding could lead to an improvement in the genetic variability in local varieties. The objective of the study was to evaluate the effect of gamma irradiation on the growth traits and yield attributes in two pigeonpea landraces (Cajanus cajan (L.) Millsp); white and brown varieties with the native name "fiofio" as used in the eastern part of Nigeria. Seeds of the landraces were obtained from the germplasm collection of the