The adaptation of native lepidopteran species to eucalyptus plantations reduces the productivity of this crop in Brazil. Oxydia vesulia Cramer (Lepidoptera: Geometridae) is a secondary pest, frequently reported in eucalyptus plantations with population outbreaks and economic damages. Methods of biological control of this pest may include the use of the exotic pupae endoparasitoid Tetrastichus howardi Olliff (Hymenoptera: Eulophidae), reported as efficient to controlling lepidopteran pests. The parasitism of O. vesulia caterpillars and pupae by T. howardi was evaluated under controlled conditions (25 [+ or -] 1[degrees]C, 60 [+ or -] 20% humidity and 12:12 h L:D). Each O. vesulia caterpillar or pupae was individually placed in a flat-bottom tube with 10 and 15 females of T howardi for 48h, respectively. The parasitoids were removed after that period, the caterpillars were fed and the pupae were maintained until emergence of the parasitoid or formation of pupae and emergence of adults of this pest. The fourth-instar caterpillars of O. vesulia, after the parasitism period, were kept in pots with Eucalyptus urophylla leaves, changed daily until the end of the experiment. A total of 40% of the caterpillars died before the pre-pupae stage, 40% reached the pupae stage and died due to inadequate adult formation and 20% generated moths, but none adult parasitoid emerged from the caterpillars. All pupae of O. vesulia were parasitized and showed emergence of parasitoids. The parasitism of O. vesulia caterpillars and pupae by T. howardi shows the potential of this natural enemy for the integrated management of this defoliator pest in eucalyptus plantations. Keywords: biological control, caterpillar and pupae parasitoid, Eucalyptus. A adaptacao de especies nativas de lepidopteros a plantios de eucalipto reduz a produtividade dessa cultura no Brasil. Oxydia vesulia Cramer (Lepidoptera: Geometridae) e praga-secundaria, frequentemente, relatada em plantios de eucalipto com surtos populacionais e danos economicos. Metodos de controle biologico, dessa praga, podem incluir o uso do endoparasitoide exotico de pupas Tetrastichus howardi Olliff (Hymenoptera: Eulophidae) relatado como eficiente para o controle de lepidopteros-pragas. O parasitismo de lagartas e pupas de O. vesulia por T. howardi foi avaliado em condicoes controladas (25 [+ or -] 1[degrees] C, 60 [+ or -] 20% umidade e 12h fotoperiodo). Cada lagarta ou pupa de O. vesulia foi colocada individualmente em tubos de fundo chato com 10 e 15 femeas de T. howardi por 48h, respectivamente e, apos esse periodo, os parasitoides foram removidos, as lagartas alimentadas e as pupas mantidas ate a emergencia do parasitoide ou formacao de pupas ou de adultos dessa praga. As lagartas de quarto instar de O. vesulia, apos o periodo de parasitismo, foram mantidas em potes com folhas de Eucalyptus urophylla trocadas, diariamente, ate o fim do experimento. Um total de 40% das lagartas de O. vesulia morreu antes da fase de pre-pupa, 40% atingiram o estagio de pupa e morreram devido a ma formacao ou problemas e 20% originaram mariposas, porem nenhum parasitoide adulto emergiu das lagartas. Todas as pupas de O. vesulia foram parasitadas e tiveram emergencia de parasitoides. O parasitismo de lagartas e pupas de O. vesulia por T. howardi mostra o potencial desse inimigo natural para o manejo integrado desse desfolhador em cultivos de eucalipto. Palavras-chave: controle biologico, parasitoide de pupas e de lagartas, Eucalyptus.