Abstract
Developments of the egg-plant stem borer Euzophera osseatella Triet (Lepidpterra :Pyralidae) was studied at constant temperatures 15,20, 25 and 30C 0 ±1 C 0 . Development of immature stages was accelerated as the tested temperatures increased. Total developmental time averaged 201, 93.43, 57.2 and 48.17 days at15, 20, 25 and 30C 0 respectively. Generation period ranged between 205.6 and 49.17 days depending on rearing temperature. Adult female survived slightly longer than male. Fecundity was higher at (15C 0 ) than 30C 0 . Female deposited 134.4 eggs at 15 C 0 , while this number drastically decreased to 62.0 eggs at 30 C 0 . However, egg hatchability (%66.25) showed a reversed trend. Thermal constant or threshold of development (t0) and thermal requirements (K ) degree- day (DDs ) were estimated to be 7.3 C 0 ,11.43 C 0 and 5.9 C 0 for eggs, larvae and pupae, respectively. Based on estimated preferred temperature30 C 0 , heat units (U.T. ) 82.85, 413.6 and 538.55 are required to compled the development of egg, larval and pupal stages. Development of one generation may acquire 931.22. degree-days.
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