EFFECTS OF CONSTANT AND ALTERNATING TEMPERATURES ON TRICHOGRAMMA-GALLOI ZUCCHI (HYM, TRICHOGRAMMATIDAE) BIOLOGY .1. DEVELOPMENT AND THERMALREQUIREMENTS

This work was carried out in order to study the effects of constant an d alternating temperatures on the development and thermal requirements of Trichogramma galloi, the most common egg parasitoid of the sugarca ne borer in Brazil. T. galloi developmental time was shorter when rear ed at alternating temperatures. The emergence rate of T. galloi decrea sed at constant 18 degrees C, and the sexual ratio was affected only a t 32 degrees C. T. galloi degree-days and threshold temperatures were similar when estimated using constant or alternating temperatures.