Cyrtoneurina pararescita (Diptera: Muscidae) (Couri, 1995) como novo hospedeiro de Nasonia vitripennis (Walker) (Hymenoptera: Pteromalidae) / Cyrtoneurina pararescita (Diptera: Muscidae) (Couri, 1995) as new host of Nasonia vitripennis (Walker) (Hymenoptera: Pteromalidae)

This study reports the occurrence of Nasonia vitripennis (Walker) (Hymenoptera: Pteromalidae) as parasitoid of Cyrtoneurina pararescita (Diptera: Muscidae) (Couri, 1995) in bovine feces obtained in Goiânia, Goiás state, Brazil. Bovine manure samples, collected at two weeks intervals, were taken to the laboratory and the pupae were extracted by water flotation. Each pupa was placed in capsules of gelatin until the emergence of dipterous or their parasitoids. The parasitism percentage was of 2.4%. This paper reports the first occurrence of N. vitripennis as parasitoid of C. pararescita worldwide.

In vitro evaluation of the effects of some acaricides on life stages of Rhipicephalus sanguineus (Acar: Ixodidae)

The action of five acaricides was evaluated on eggs, larvae, nymphs and adults of the ixodid tick Rhipicephalus sanguineus. The acaricides tested were: high cis-cypermethrin (0.01 per cent) + DDVP (0.11 per cent), coumaphos (0.05 per cent), deltamethrin (0.0025 per cent) and cypermethrin (0.015 per cent). Eggs treated with high cis-cypermethrin and cypermethrin showed eclosion inhibitions of 72.1 per cent and 67.3 per cent, respectively, whereas coumaphos was much less effective (only 11.7 per cent). Except for coumaphos, which resulted in 63.3 per cent and 80.0 per cent mortality of nymphs and unfed females, respectively, all compounds tested killed 100 por cento of all tick stages to which they were exposed

Fauna ixodológica do pavilhäo auricular de eqüinos em municípios de Minas Gerais e da Bahia / Ixodological populations of the ears of equines in Minas Gerais and Bahia, Brazil

Between June/1990 and February/1991, an experiment about ixodological populations of the ears of equines from counties of Minas Gerais and from Guanambi, Bahia, was carried out. Anocentor nitens was the mostprevalent (97.50 per cent) and most abundant (98.35 per cent) species, followed by Boophilus microplus (36.10 per cent and 1.59 per cent) and Amblyomma cajennense (20.50 per cent e 0.06 per cent). The larvae of A. nitens and B. microplus were more prevalent than the other parasitic stages, and we didn't find larvae of A. cajennense. The ratios between male and female were 3.5 and 1.7, to B. microplus and A. nitens, respectively (

Aspectos biológicos do Dermacentor nitens (Neumann, 1897) em condiçöes de laboratório / Biological aspects of the Dermacentor nitens (Neumann, 1897) in the laboratory

Realizou-se estudo sobre aspectos biológicos da fase näo parasitária do Dermacentor nitens proveniente de equinos de vários municípios de Minas Gerais e de Guanambi, Bahia. Entre as várias amostras estudadas, verificaram-se diferenças nos percentuais de eclosäo e nos índices de eficiência reprodutiva em decorrência do grande número de fêmeas ingurgitadas que näo realizou postura, e semelhanças nos períodos de pré-postura, postura e incubaçäo, sugerindo constante fluxo gênico entre as populaçöes estudadas

Teste "in vitro" de sensibilidade a acaricidas em fêmeas ingurgitadas de Dermacentor nitens (Neumann, 1897) oriundas de equinos de Minas Gerais e Bahia / \"In vitro\" susceptibility to acaricides of Dermacentor nitens (Neumann, 1897) engorged females of equines

Avaliou-se a sensibilidade de fêmeas ingurgitadas de Dermacentor nitens provenientes de equinos de vários municípios de Minas Gerais e de Guanambi, Bahia, frente a acaricidas de bases fosforado, piretróide e fosforado + piretróide. Observaram-se diferenças de sensibilidade ao produto fosforado entre as amostras estudadas. Com exceçäo da amostra proveniente de Montalvânia/Varzelândia, todas as amostras foram igualmente sensíveis ao produto piretróides e todas elas sensíveis ao produto misto