ZooKeys 102: 77–82, doi: 10.3897/ZooKeys.102.1343
Paracrias pluteus (Hymenoptera, Eulophidae) in Brazil: new distribution and host records, and with a new host group for Paracrias
Tiago G. Pikart1, Gabriely K. Souza1, Valmir A. Costa2, Christer Hansson3, José C. Zanuncio1
1 Departamento de Biologia Animal, Universidade Federal de Viçosa, 36570-000, Viçosa, Minas Gerais, Brazil
2 AInstituto Biológico/APTA, 13012-970, Campinas, São Paulo, Brazil, C.P. 70
3 The Natural History Museum, London, England

Corresponding author: Tiago G. Pikart (tiago.pikart@ufv.br).

Academic editor: Michael Sharkey

received 2 April 2010 | accepted 18 April 2011 | Published 2 June 2011


(C) 2011 Tiago G. Pikart. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


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Abstract

Bruchines damage agricultural crops and trees, reducing the quantity and quality of the seeds. The aim of this study is to record, for the first time, Paracrias pluteus as a parasitoid on the immature stages of Sennius spodiogaster and Sennius cupreatus on seeds of Melanoxylon brauna in Teixeiras, Minas Gerais State, Brazil. Paracrias pluteus is a parasitoid without previous host records and known only from Costa Rica. Specimens obtained in this study add to knowledge of the biology of Paracrias species with a new host group (Chrysomelidae: Bruchinae), and the first host record and a new distribution for Paracrias pluteus.

Keywords

Bruchinae, seeds, parasitoid, Hymenoptera, Eulophidae, Paracrias pluteus, new distribution, Brazil

Introduction

Bruchines (Coleoptera: Chrysomelidae: Bruchinae) are considered pests of seeds of native and cultivated legumes in Latin America, causing damage to several economically important agricultural species (Rojas-Rousse et al. 2007) such as Glycine max (Costa et al. 2007), Phaseolus coccineus, Phaseolus vulgaris, Phaseolus lunatus (Hansson et al. 2004, Bonet 2008), Vigna radiata (Somta et al. 2008), Vigna unguiculata (Aebi et al. 2008), and tree species such as Enterolobium contortisiliquum (Morandini and De Viana 2009), Melanoxylon brauna (Santos et al. 1991), Mimosa bimucronata (Silva et al. 2007), Sclerolobium sp. (Santos et al. 1997) and Senna multijuga (Sari and Ribeiro-Costa 2005).

Infestations of bruchines result in a large reduction of the quantity and quality of seeds, making them unsuitable for human consumption and for agricultural use (Somta et al. 2008). Currently the most efficient method to control these infestations on a large scale is to fumigate the seeds with chemicals (Sing et al. 2008), but this method has economic, social and environmental implications (Somta et al. 2008). Therefore, control measures including plant resistance (Ignacimuthu et al. 2000, Schmale et al. 2003, Appleby et al. 2004), plant extracts with biocide activity (Raja et al. 2004, Koona et al. 2005), and natural enemies (Sanon et al. 1998, Gauthier et al. 1999, Schmale et al. 2006) such as parasitoids of the families Braconidae, Eulophidae, Pteromalidae (Schmale et al. 2001, 2002, Rojas-Rousse et al. 2007) and Trichogrammatidae (Pintureau et al. 1999) constitute more sustainable alternatives.

The aim of this study is to record, for the first time, the occurrence of Paracrias pluteus Hansson, 2002 (Hymenoptera: Eulophidae) as a parasitoid on immature stages of Sennius spp. (Coleoptera: Chrysomelidae: Bruchinae) on Melanoxylon brauna Schott in Teixeiras, Minas Gerais State, Brazil.

Materials and methods

Seeds of Melanoxylon brauna infested by bruchines were studied in the Laboratório de Sementes Florestais (LASF), Universidade Federal de Viçosa (UFV) in Viçosa (20°46'11"S, 42°52'31"W), Minas Gerais State, Brazil. Seeds were collected in Teixeiras, Minas Gerais State, in September 2009 and sent to LASF where they were stored in plastic bags in a room of the laboratory without temperature, humidity or photoperiod control. Insects that emerged from the seeds were collected and stored in 70% alcohol for subsequent identification. Two bruchine species were and identified as Sennius spodiogaster Kingsolver, 1987 and Sennius cupreatus Kingsolver, 1987 (Coleoptera: Chrysomelidae: Bruchinae). Apart from the bruchines, three females and nine males of a parasitoid species emerged. This parasitoid was subsequently identified as Paracrias pluteus.

Results and discussion

Paracrias pluteus is a parasitoid without previous host records and known only from Costa Rica (Hansson 2002). The knowledge of the biology of Paracrias is poor, the only known hosts are Curculionidae beetles that attack seeds (Schauff 1985) or buds (Woolley and Schauff 1987). The specimens obtained in this study add to this knowledge with a new host group (Chrysomelidae: Bruchinae) for the genus, and the first host record for Paracrias pluteus.

Paracrias species occur exclusively in the New World with the greatest diversity in the tropics (Hansson 2002). In 2001 eight species were known, but Gumovsky (2001) and Hansson (2002) increased this number to 65. Hansson (2009) released an interactive identification key for Paracrias species online (http://www.neotropicaleulophidae.com/Index.html), but species described by Gumovsky were not included because their descriptions did not include most of the characters used in the key.

Even though the number of described species of Paracrias is relatively high, Paracrias pluteus is only the fifth species of the genus known to occur in Brazil. Paracrias was described by Ashmead (1904) from specimens collected in Brazil, with the singular included species Paracrias laticeps Ashmead. The other species that occur in Brazil are Paracrias panamensis Gumovsky (Gumovsky 2001), Paracrias beus Schauff (De Santis and Fidalgo 1994) and Paracrias petilicornis Hansson (Hansson 2002).

Paracrias pluteus belongs to the ordinatus species-group, which is characterized by the forewing which has a narrow membrane along the fore margin of marginal vein, post-marginal vein absent, a very large speculum, and wing membrane distal to speculum sparsely setose (Hansson 2002). Within this group, Paracrias pluteus is distinguished mainly by having a strong, transverse and flat carina on procoxae and with prepectus fully reticulated (Figs 1 and 2). Males are distinguished from females by having all flagellomeres distinctly separated, a longer petiole and by being more colorful (Figs 1 and 2).

Melanoxylon brauna is a plant of high economic value, and Sennius spodiogaster and Sennius cupreatus may destroy as much as 50% of its seeds (Santos et al. 1991). Studies on the biology of Paracrias pluteus may provide important information for its use in programs of biological control of these bruchines.

Figure 1.

Lateral view of Paracrias pluteus adult female. Lateral view of Paracrias pluteusHansson, 2002 (Hymenoptera: Eulophidae) adult female with detail to prepectus entirely reticulated and its less bright body color. Teixeiras, Minas Gerais State, Brazil.

Figure 2.

Frontal view of Paracrias pluteus adult male head. Frontal view of Paracrias pluteus Hansson, 2002 (Hymenoptera: Eulophidae) adult male head with detail to prepectus entirely reticulated (yellow arrow), procoxae carina (red arrow), its antennae and its bright body color. Teixeiras, Minas Gerais State, Brazil.

Acknowledgements

To “Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)”, “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)” and “Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)” for financial support.

References
Aebi A, Shani T, Hansson C, Contreras-Garduno J, Mansion G, Benrey B (2008) The potential of native parasitoids for the control of Mexican bean beetles: A genetic and ecological approach. Biological Control 47:289-297. doi:10.1016/j.biocontrol.2008.07.019
Appleby JH, Credland PF (2004) Environmental conditions affect the response of West African Callosobruchus maculatus (Coleoptera: Bruchidae) populations to susceptible and resistant cowpeas. Journal of Stored Products Research 40:269-287. doi:10.1016/S0022-474X(03)00013-4
Ashmead WH (1904) Classification of the chalcid flies. Memoirs of the Carnegie Museum 1:225-551.
Bonet A (2008) New hosts, host plants, and distribution records for Horismenus (Hymenoptera: Eulophidae) species in a bruchid beetle parasitoid guild attacking wild type Phaseolus coccineus and P. vulgaris in central Mexico. Florida Entomologist 91:698-701.
Costa VA, Guzzo EL, Lourenção AL, Garcia MA, Tavares C, Vendramim JD (2007) Occurrence of Dinarmus basalis in Callosobruchus analis in stored soybean in São Paulo, Brazil. Scientia Agricola 64:301-302.
De Santis L, Fidalgo P (1994) Catalogo de Himenopteros Calcidoideos. Serie de la Academia Nacional de Agronomía y Veterinaria 13:1-154.
Gauthier N, Sanon A, Monge JP, Huignard J (1999) Interspecific relations between two sympatric species of Hymenoptera, Dinarmus basalis (Rond) and Eupelmus vuilleti (Crw), ectoparasitoids of the bruchid Callosobruchus maculates (F). Journal of Insect Behaviour 12:399-413. doi:10.1023/A:1020847707439
Gumovsky AV (2001) Review of the genus Paracrias (Hymenoptera, Eulophidae, Entedoninae). Vestnik Zoologii 35:9-26.
Hansson C (2002) Eulophidae of Costa Rica (Hymenoptera: Chalcidoidea), 1. Memoirs of the American Entomological Institute 67:1-290.
Hansson C, Aebi A, Benrey B (2004) Horismenus species (Hymenoptera: Eulophidae) in a bruchid beetle parasitoid guild, including the description of a new species. Zootaxa 548:1-16.
Hansson C (2009) Neotropical Eulophidae. http://www.neotropicaleulophidae.com/Index.html
Ignacimuthu S, Janarthanan S, Balachandran B (2000) Chemical basis of resistance in pulses to Callosobruchus maculatus (F.) (Coleoptera: Bruchidae). Journal of Stored Products Research 36:89-99. doi:10.1016/S0022-474X(99)00031-4
Kingsolver JM (1987) Six new species of Bruchidae (Coleoptera) from Venezuela and Brazil with notes on a Brazilian pest of stored pigeon peas. Experientiae 30:57-79.
Koona P, Dorn S (2005) Extracts from Tephrosia vogelii for the protection of stored legume seeds against damage by three bruchid species. Annals of Applied Biology 147:43-48. doi:10.1111/j.1744-7348.2005.00006.x
Morandini MN, De Viana ML (2009) Pre-dispersal seed predation in three populations of the tree Enterolobium contortisiliquum (Fabaceae). Revista de Biologia Tropical 57:781-788.
Pintureau B, Gerding M, Cisternas E (1999) Description of three new species of Trichogrammatidae (Hymenoptera) from Chile. Canadian Entomology 131:53-63.`doi:10.4039/Ent13153-1
Raja N, Albert S, Ignacimuthu S, Dorn S (2001) Effect of plant volatile oils in protecting stored cowpea Vigna unguiculata (L.) Walpers against Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) infestation. Journal of Stored Products Research 37:127-132. doi:10.1016/S0022-474X(00)00014-X
Rojas-Rousse D, Poitrineau K, Basso C (2007) The potential of mass rearing of Monoksa dorsiplana (Pteromalidae) a native gregarious ectoparasitoid of Pseudopachymeria spinipes (Bruchidae) in South America. Biological Control 41:348-353. doi:10.1016/j.biocontrol.2007.03.009
Sanon A, Ouedraogo AP, Tricault Y, Credland PF, Huignard J (1998) Biological control of bruchids in cowpea stores by release of Dinarmus basalis (Hymenoptera: Pteromalidae) adults. Environmental Entomology 27:717-725.
Santos GP, Zanuncio JC, Anjos N, Silva JC, Alves JB (1991) Danos causados por Sennius cupreatus e Sennius spodiogaster (Coleoptera: Bruchidae) em sementes de Melanoxylon brauna. Revista Ceres 38:315-322.
Santos GP, Zanuncio TV, Junior SLD, Zanuncio JC (1997) Damage by Sennius amazonicus, Sennius sp and Amblycerus sp (Coleoptera: Bruchidae) on Sclerolobium sp (Leguminosae) seeds. Revista de Biologia Tropical 45: 883–886.
Sari LT, Ribeiro-Costa CS (2005) Predação de Sementes de Senna multijuga (Rich.) H.S. Irwin & Barneby (Caesalpinaceae) por Bruquíneos (Coleoptera: Chrysomelidae). Neotropical Entomology 34:521-525. doi:10.1590/S1519-566X2005000300025
Schauff ME (1985) The new world genus Paracrias Ashmead (Hymenoptera: Eulophidae). Proceedings of the Entomological Society of Washington 87:98-109.
Schmale I, Wäckers FL, Cardona C, Dorn S (2001) Control potential of three hymenopteran parasitoid species against the bean weevil in stored beans: the effect of adult parasitoid nutrition on longevity and progeny production. Biological Control 21:134-139. doi:10.1006/bcon.2000.0911
Schmale I, Wackers FL, Cardona C, Dorn S (2002) Field infestation of Phaseolus vulgaris by Acanthoscelides obtectus (Coleoptera: Bruchidae), parasitoid abundance, and consequences for storage pest control. Environmental Entomology 31:859-863. doi:10.1603/0046-225X-31.5.859
Schmale I, Wäckers FL, Cardona C, Dorn S (2003) Combining parasitoids and plant resistance for the control of the bruchid Acanthoscelides obtectus in stored beans. Journal of Stored Products Research 39:401-411. doi:10.1016/S0022-474X(02)00034-6
Schmale I, Wäckers FL, Cardona C, Dorn S (2006) Biological control of the bean weevil, Acanthoscelides obtectus (Say) (Col.: Bruchidae), by the native parasitoid Dinarmus basalis (Rondani) (Hym.: Pteromalidae) on small-scale farms in Colombia. Journal of Stored Products Research 42:31-41. doi:10.1016/j.jspr.2004.10.005
Silva LA, Maimoni-Rodella RCS, Rossi MN (2007) A preliminary investigation of pre-dispersal seed predation by Acanthoscelides schrankiae horn (Coleoptera: Bruchidae) in Mimosa bimucronata (DC.) Kuntze trees. Neotropical Entomology 36: 197–202. doi:10.1590/S1519-566X2007000200005
Sing SE, Arbogast RT (2008) Predatory response of Xylocoris flavipes to bruchid pests of stored food legumes. Entomologia Experimentalis et Applicata 126:107-114. doi:10.1111/j.1570-7458.2007.00647.x
Somta C, Somta P, Tomooka N, Ooi PAC, Vaughan DA, Srinives P (2008) Characterization of new sources of mungbean (Vigna radiata (L.) Wilczek) resistance to bruchids, Callosobruchus spp. (Coleoptera: Bruchidae). Journal of Stored Products Research 44:316-321. doi:10.1016/j.jspr.2008.04.002
Woolley JB, Schauff ME (1987) A new species of Paracrias (Hymenoptera: Eulophidae) parasitic on Anthonomus spp. (Coleoptera: Curculionidae). Proceedings of the Entomological Society of Washington 89:770-775.