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Helicoverpa armigera  (Hübner) (Lepidoptera: Noctuidae) is a polyphagous pest with a wide geographic distribution. This pest first arrived in Brazil in 2013, and since then studies on possible control methods for it have been necessary. A possible method for the control of  H .  armigera  is using the egg parasitoid  Trichogramma pretiosum  Riley (Hymenoptera: Trichogrammatidae). Therefore, the objective of this study was to evaluate the performance of  T .  pretiosum  on  H .  armigera  eggs, which are known to represent suitable hosts for the development of this parasitoid species in the laboratory. Parasitism and emergence rates and the duration of the egg-to-adult period of  T .  pretiosum  were investigated following 24- and 48-h exposures of this parasitoid to  H .  armigera  and  Corcyra cephalonica  (Stainton) (Lepidoptera: Pyralidae) eggs. The longevity of offspring after the 24-h exposure was studied, as well as the frequency of parasitism and emergence, host preference, and the emergence of offspring from eggs of different ages or oviposited by lepidopterans on different days. Parasitism was 14.4 and 34.9% more frequent on  C .  cephalonica  than on  H .  armigera  after 24 and 48 h of exposure, respectively. In  C .  cephalonica , parasitism was 27.2% higher after 48 h. Parasitism was more frequent on  C .  cephalonica  eggs collected on the second day of oviposition (76.2%), and on  H .  armigera  on the third day of oviposition (71.1%). Parasitism frequency was lower on 2-day-old  C .  cephalonica  eggs (63.3%) and on 3-day-old  H .  armigera  eggs (41.3%). When tested with a chance of choice between hosts,  T .  pretiosum  preferred  H .  armigera , while in the test with no chance of choice there was no difference in preference. Thus,  T .  pretiosum  may be considered a tool for the Integrated Pest Management (IPM) of  H .  armigera .

Performance of Trichogramma pretiosum Riley (Hymenoptera: Trichogrammatidae) on eggs of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae)