Nasonia vitripennis (Walker) (Hymenoptera: Pteromalidae) parasitóide de dípteros muscóides coletado em Itumbiara, Goiás Nasonia vitripennis (Walker) (Hymenoptera: Pteromalidae) parasitoid of muscoids dipterous collected in Itumbiara, Goias, Brazil

<abstract language="eng">This work reports the occurrence of parasitoid Nasonia vitripennis (Walker) (Hymenoptera: Pteromalidae) parasitizing pupae of flies (Diptera) in different substrata in Itumbiara, Goiás. The pupae were obtained by the flotation method. They were individually placed in gelatin capsules until the emergence of flies or their parasitoids. From May 1998 through April 2002, 737 parasitoids were collected in human feces, cattle liver, chicken, fish and cattle kidney. The prevalence of parasitism was 67.8%

Microhimenópteros parasitóides de dípteros muscóides coletados em diferentes substratos em área de mata em Itumbiara, Goiás Microhimenopterous parasitoids of muscoids dipterous collected from different substrata in a wood area in Itumbiara, Goias, Brazil

<abstract language="eng">This paper reports the occurrence of parasitoids in pupae of flies (Diptera) collected from several different substrata in Itumbiara, Goiás, Brazil. The pupae were isolated by flotation. They were individually placed into gelatin capsules and kept until the emergency of adult flies or their parasitoids. From March 2001 through April 2002, a total of 684 parasitoids and 830 pupae of flies were collected from humans feces, chicken viscera, fish, and bovine kidney. Brachymeria podagrica were identified in a high number of samples. The prevalence of parasitism was of 82.4%

Desempenho reprodutivo de Nasonia vitripennis Walker (Hymenoptera: Pteromalidae) em pupas crioconservadas de Chrysomya megacephala Fabricius (Diptera: Calliphoridae): avaliação preliminar Reproductive performance of Nasonia vitripennis Walker (Hymenoptera: Pteromalidae) on Chrysomya megacephala Fabricius (Diptera: Calliphoridae) cryopreserved pupae: preliminary evaluation

Avaliou-se o desempenho reprodutivo de Nasonia vitripennis Walker (Hymenoptera: Pteromalidae) em pupas de Chrysomya megacephala Fabricius (Diptera: Calliphoridae) previamente armazenadas a - 20ºC de temperatura, durante 77 dias, com e sem passagem prévia em nitrogênio líquido (NL) por um, três e 15 minutos. O grupo controle foi caracterizado por pupas hospedeiras frescas. Os muscóides foram expostos aos parasitóides durante 72 horas. Utilizou-se a relação de uma pupa muscóide por fêmea parasitóide. A amostra de pupas frescas permitiu a emergência de 15 parasitóides/ pupa, em média, enquanto 10 parasitóides / pupa emergiram dos espécimens prévia e diretamente armazenados em freezer (-20ºC). Observou-se um acentuado decréscimo do desempenho reprodutivo dos microhimenópteros que exploraram os substratos previamente submetidos ao NL durante um, três e 15 minutos (<img border=0 id="_x0000_i1026" src="../../../../img/revistas/cr/v34n1/n1a32fr01.gif">: 6,1; 5,5 e 5,7, respectivamente). A dissecação das pupas hospedeiras revelou um expressivo número de pteromalídeos imaturos, nas amostras que foram expostas ao NL, e de adultos faratos, em todos os tratamentos<br>The reproductive performance of Nasonia vitripennis Walker (Hymenoptera: Pteromalidae) was evaluated on pupae of Chrysomya megacephala Fabricius (Diptera: Calliphoridae) kept at -20ºC, during 77 days, with and no previous passage for liquid nitrogen (NL) by one, three and 15 minutes. Control groups were characterized for fresh pupae hosts. There was one pupa for each parasitoid. The sample of fresh pupae exhibited average of 15 emergent parasitoids / pupa while pupae stored directly at freezer (-20ºC) presented an average of 10 emergent parasitoids / pupa. In the samples exposed at one, three and 15 minutes in NL, accentuated decrease was observed on emergent hymenopterans reproductive performance (<img border=0 id="_x0000_i1028" src="../../../../img/revistas/cr/v34n1/n1a32fr01.gif">: 6.1; 5.5 and 5.7 respectively). The dissection of pupae revealed a large number of immature pteromalid in the groups with liquid nitrogen passage and farate adults in all the groups