ABSTRACT The tropical sod webworm, Herpetogramma phaeopteralis Guenée is a major turfgrass pest in the southeastern United States. We evaluated larval development on five artificial diets and at six temperatures (15, 20, 25, 30, 32.5, 35 +/- 1 degree C) on St. Augustinegrass (Stenotaphrum secundatum (Walter) Kuntze). Only larvae fed St. Augustinegrass and soy-wheat germ diets completed their li...