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REPRODUCTIVE PERFORMANCE OF Trichogramma pretiosum RILEY ON Trichoplusia ni HÜBNER UNDER DIFFERENT THERMAL CONDITIONS

The objective of the present study was to evaluate the reproductive performance of Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) on eggs of Trichoplusia ni Hubner (Lepidoptera: Noctuidae) when submitted to different thermal conditions. Cartons containing eggs of T. ni were daily exposed to parasitism by females of T. pretiosum for 24 h at the temperatures of 18; 21; 24; 27; 30 and 33°C until death of the females. Based on the data collected, fertility life tables were constructed. The greatest daily fertility was obtained in the first day of parasitism for the temperature of 30°C (8.2 eggs/female), while the greatest total fertility was obtained at the temperature of 21°C (23.1 eggs/female). Survival of T. pretiosum was lowest at the highest temperatures. The Ro was similar for the temperature range of 24 to 30°C. The r m and λ were directly proportional to the increase in temperature in the range studied (18 to 33°C). On the other hand, T and Td were inversely proportional to the increase in temperature. Therefore, it was concluded that temperature affects the reproductive performance of T. pretiosum and that the most favorable temperature range for this parasitoid is between 24 and 27°C.