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Biological aspects of Trichogramma pretiosum Riley, 1879, reared on artificial host Ephestia kuehniella (Zeller, 1879), were studied in incubators at 25°C (± 1°C); 60% (± 10%) RH and 14h photophase with the aim of obtaining basic information for the biological control of Heliothis zea (Boddie, 1850) in corn crop. The average duration of the life cycle (egg‐adult) of T. pretiosum was similar when reared on natural and factitious host. Sexual ratio of the parasitoid was not affected by the natural or factitious host. The longevity of T. pretiosum was higher when reared on factitious host relating to natural host. The parasitism capacity of the two strains of T. pretiosum on E. kuehniella eggs was similar, with a high rate of parasitism in the first four days of the female's life.

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The citrus leafminer, Phyllocnistis citrella (Gracillariidae), is among the main pests of citrus in Brazil. The objective of this work was to conduct a survey of parasitoids attacking CLM in Jaguariúna, State of São Paulo, Brazil, before and after the introduction of Ageniaspis citricola (Encyrtidae). Collections of new leaves were made weekly at citrus groves from July-1997 to April-1999. During the survey period, A. citricola was introduced in the area. Before this introduction, Galeopsomyia fausta (Eulophidae) was the predominant species (about 91.83% of the species composition), but A. citricola became predominant after its establishment (60.10% against 38.30% G. fausta). Other parasitoids found were Cirrospilus sp. C (Eulophidae), Horismenus sp. (Eulophidae), Elasmus sp. (Elasmidae), Eupelmus sp. (Eupelmidae) and Conura (Ceratosmicra) sp. (Chalcididae).

Estudou-se o efeito do número e intervalo de liberações de Trichogramma pretiosum Riley, no parasitismo e controle de Helicoverpa zea (Boddie) na cultura do milho. Observou-se um incremento de até 5 vezes no parasitismo de ovos quando foram realizadas 3 liberações de 100.000 adultos de T. pretiosum por ha. A redução no dano nas espigas por H. zea em áreas de liberação de T. pretiosum foi de até 26%, mostrando o potencial de controle biológico do parasitóide.

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