Evaluation of eight maize germplasms developed in Ecuador for resistance to leaf-feeding fall armyworm.
The fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), causes economic damage to maize (Zea mays L.) and is resistant to several classes of insecticide. Native resistance in maize to fall armyworm could enhance existing control tactics. The objective for the study was to test maize germplasm developed from Ecuador for resistance to leaf-feeding fall armyworm. Plants were grown in the field and artificially infested at the seven-leaf stage with fall armyworm. Visual rating scores for leaf damage were recorded at 7- and 14-days post infestation. Maize PI 487903, Ames 28851, and PI 390554 received 14-day scores of ≤6.0 across both years of testing and were considered moderately resistant. PI 487903 was not significantly different than resistant check GT-FAWCC(C5). All germplasms tested are tropical populations that require breeding to enable more research in temperate regions.