Technical Abstract: Corn (maize) germplasm lines Mo48 and Mo49 are yellow dent inbred lines developed for European corn borer (ECB) resistance by the Plant Genetics Research Unit of the USDA-ARS in cooperation with the Missouri Agricultural Experiment Station, University of Missouri-Columbia. European corn borers continue to cause economic losses by tunneling into stalks, shanks, and ears; disrupting growth; and introducing rotting organisms which results in lodged plants and ears. These lines contain diverse sources of resistance to this important economic pest and offer a source of native-plant, non-transgenic germplasm for breeders to incorporate into commercial corn.