Growth of the Green Cloverworm and a Thermal-Unit System for Development 1

Abstract
Green cloverworm, Plathypena scabra , (Lepidoptera: Noctuidae), development was studied at various temperatures. Egg-to-adult green cloverworm development ranged from 80.3 days at 60°F for combined males and females to 28.5 days at 85°F. Development of males was significantly longer (2.4 days) than that of females. A thermal-unit system for combined GCW development was established. Accumulations of 123, 630, and 875 thermal units were required for egg, larval, and pupal development.