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First report of the parasitoid Pachycrepoideus vindemmiae (Rondani, 1875) (Hymenoptera: Pteromalidae) parasitizing Synthesiomyia nudiseta (Van der Wulp, 1883) (Diptera: Muscidae).

The hosts of Pteromalidae include Hemiptera, Neuroptera, Coleoptera, Lepidoptera, Diptera, Siphonaptera, Hymenoptera, Dermaptera and Homoptera. Pteromalidae attack eggs, larvae, pupae or, rarely, adults. The main contribution of pteromalids towards insect control is in relation to muscoid flies, especially house flies and stable flies (Gauld and Bolton, 1988; Hanson and Gauld, 1995).

The adults of some species of the family Muscidae are vectors, through their bite or in a passive manner, for the pathogens of diseases such as typhoid fever, dysentery, anthrax and African sleeping sickness. House flies overwinter in either the larval or pupal stage under manure piles or in other protected locations. This is the most common insect family found on pig and poultry farms, in horse stables and on ranches (Renaud et al., 2012).

Synthesiomyia nudiseta (Van der Wulp, 1883) (Diptera: Muscidae) is a fly with Neotropical geographical distribution. In Brazil, it shows preference for inhabited areas, which makes this fly a potential vector for pathogens (Greenberg, 1971; Aruna et al., 2011; Velasquez et al., 2013).

Pachycrepoideus vindemmiae (Rondani, 1875) (Hymenoptera: Pteromalidae) is to be a solitary parasitoid that controls a great number of Diptera in the families Anthomyiidae, Calliphoridae, Muscidae, Sarcophagidae, Tachinidae and Tephritidae. This species presents diversified (cosmopolitan) distribution and it has been found in North America and Africa (Hanson and Gauld, 1995).

The objective of this paper was to report a new host for the parasitoid P. vindemmiae, which was collected in the urban region of Goiania, in the central part of the state of Goias, Brazil.

The experiment was conducted in the urban area of Goiania, in the central part of the state of Goias, Brazil. The flies were collected by using traps, made of dark cans measuring 19 cm in height and 9 cm in diameter, with two openings resembling blinders, located in the lowest third of the can, to allow flies to enter. The top of the can was connected to a nylon funnel that was open at both ends, with the base pointing down. This was wrapped in plastic bags, so that when they were removed, the flies and parasitoids could be collected. The following items were used as baits: human feces, cattle kidneys, cattle liver, chicken and fish which were placed inside the cans, over a layer of earth. Five traps were used and they were hung on trees at a height of one meter above the ground, two meters apart from each other.

The insects collected were taken to the laboratory, sacrificed with ethyl ether and kept in 70% alcohol for further identification. To obtain the parasitoids, the contents of the traps were placed in plastic containers with a layer of sand for use as a substrate for transformation of the larvae into pupae. This sand was sifted after being in the fields for 15 days and the pupae were extracted from it and were individually placed in gelatin capsules (number 00) in order to obtain the flies and/or parasitoids.

The species were stored in the Biology Laboratory of Institute of Tropical Pathology and Public Health. The species identification was performed by one of the authors.

The total percentage parasitism was calculated by means of the number of pupae parasitized, divided by the total number of pupae collected, and multiplied by 100.

Between January and May 2014, two specimens of P. vindemmiae were collected from 26 pupae of S. nudiseta. The percentage parasitism observed was 7.7%. The percentage parasitism can also be correlated with the parasitoid's search capacity and with the availability of resources.

These dipterous insects are potential mechanical vectors for etiological agents such as viruses, bacteria, protozoan cysts and helminth eggs (Greenberg, 1971; Marchiori, 2006). The occurrence, distribution and prevalence of these dipterous insects in metropolitan areas are factors of great public health importance. In rural areas, these insects can cause decreased egg production and animal diseases, and they constitute a nuisance for human populations close to the breeding sites (Couri and Barros, 2010; Ekanem et al., 2013; Marchiori, 2007; Marchiori et al., 2014).

Pachycrepoideus vindemmiae is considered a parasitoid of pupae of a great number of Diptera, including species of the generaAnastrepha, Calliphora, Ceratitis, Chrysomya, Drosophila, Fannia, Haematobia, Hylemya, Lucilia, Megaselia, Musca, Ophyra, Ornidia, Oxysarcodexia, Palaeosepsis, Paratheresia, Phaenicia, Phormia, Poecilosomella, Peckia,

Rhagoletis, Sarcophagula, Sarcodexia and Zaprionus (Hanson and Gauld, 1995; Marchiori, 2000; Marchiori and Barbaresco, 2007; Marchiori et al., 2003, 2013).

One possibility for controlling these flies is to use natural regulators such as parasitoids, which are agents responsible for reducing the synanthropic fly populations.

http://dx.doi.org/10.1590/1519-6984.03516

References

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C. H. Marchiori (a), *, L. M. F Borges (b)

(a) Instituto Federal Goiano--IF Goiano, Universidade Federal de Goias--UFG, Rua 235, s/n, Setor Universitario, CEP 74605050, Goiania, GO, Brazil

(b) Instituto de Patologia Tropical e Saude Publica--IPTSP, Universidade Federal de Goias--UFG, Rua 235, s/n, Setor Universitario, CEP 74605050, Goiania, GO, Brazil

* e-mail: chmarchiori@yahoo.com.br

Received: March 15, 2016--Accepted: May 19, 2016--Distributed: August 31, 2017
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Title Annotation:Notes and Comments
Author:Marchiori, C.H.; Borges, L.M.F.
Publication:Brazilian Journal of Biology
Date:Jul 1, 2017
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