Services on Demand
On-line version ISSN 1678-8052
Neotrop. Entomol. vol.32 no.2 Londrina Apr./June 2003
First record of Coptera haywardi Loiácono (Hymenoptera: Diapriidae) as a parasitoid of fruit-infesting Tephritidae (Diptera) in Brazil
Primeiro registro de Coptera haywardi Loiácono (Hymenoptera: Diapriidae) como parasitóide de Tephritidae frugívoros (Diptera) no Brasil
Elen L. Aguiar-MenezesI; Euripedes B. MenezesII; Marta S. LoiáconoIII
IEmbrapa Agrobiologia, BR 465, km 7, C. postal 74505, 23890-000, Seropédica, RJ
IIUniversidade Federal Rural do Rio de Janeiro, CIMPUR "CRG", BR 465, km 7, 23890-000, Seropedica, RJ
IIIDepto. Científico de Entomologia, Museo de La Plata, Paseo Del Bosque, s/n, 1900, La Plata, Buenos Aires, Argentina
This study reports the first occurrence of Coptera haywardi Loiácono as a pupal parasitoid of fruit-infesting Tephritidae in Brazil. We reared this diapriid from fruits of Eugenia uniflora (Surinam cherry) infested by Anastrepha fraterculus (Wiedemann) and/or Anastrepha sororcula Zucchi. We also identified two other species of pupal parasitoids: Pachrycrepoideus vindemmiae Rondani and Spalangia endius Walker (Pteromalidae). Four species of larval-pupal parasitoids were also recorded: Doryctobracon areolatus (Szépligeti), Utetes (Bracanastrepha) anastrephae (Viereck), Opius bellus Gahan (Braconidae) and Aganaspis pelleranoi (Brèthes) (Figitidae).
Key words: Insecta, fruit fly, Proctotrupoidea, Braconidae, Figitidae, Pteromalidae
Este estudo relata a primeira ocorrência de Coptera haywardi Loiácono como parasitóide de pupa de Tephritidae que infestam frutos no Brasil. Este diapriídeo foi obtido de frutos de Eugenia uniflora (pitanga) infestados por Anastrepha fraterculus (Wiedemann) e/ou Anastrepha sororcula Zucchi. Foram também identificadas outras duas espécies de parasitóides de pupa: Pachrycrepoideus vindemmiae Rondani e Spalangia endius Walker (Pteromalidae). Quatro espécies de parasitóides de larva-pupa foram também obtidas: Doryctobracon areolatus (Szépligeti), Utetes (Bracanastrepha) anastrephae (Viereck), Opius bellus Gahan (Braconidae) e Aganaspis pelleranoi (Brèthes) (Figitidae).
Palavras-chave: Insecta, moscas-das-frutas, Proctotrupoidea, Braconidae, Figitidae, Pteromalidae
Among the natural enemies of tephritid fruit flies, the hymenopteran parasitoids are almost exclusively responsible for the equilibrium of their populations. The majority of these parasitoids belong to Braconidae whereas the few others belong to Figitidae, Diapriidae, Pteromalidae and Eulophidae (Ovruski et al. 2000).
The family Diapriidae, particularly the subfamily Diapriinae, includes species of parasitoids of Diptera Cyclorrhapha, such as Tephritidae (Muesebeck 1980). Studies on the biology and life history of diapriids suggest that most of them are pupal parasitoids of Diptera (Costa Lima 1962, Riek 1979), and all pupal parasitoids are by definition idiobionts (Godfray 1994).
According to Ovruski et al. (2000), the number of pupal parasitoids thus far recorded from the Neotropical region is considerably less than the number known from the Palaearctic. Costa Lima (1940) originally described a Brazilian diapriine species, Trichopria (= Planopria) anastrephae, collected in association with Anastrepha serpentina Wiedemann from hog plum (Spondias sp.).
Historically the use of pupal parasitoids to control tephritid pests has not been particularly successful because many of those that parasitize Diptera, like Pachrycrepoideus vindemmiae Rondani, are poor dispensers, polyphagous, and there is a risk of hyperparasitism.
The objective of this study was to report the occurrence of the genus Coptera in Brazil as pupal parasitoids of fruit-infesting Tephritidae, and hence to increase the knowlege of the geographical distribution of diapriines.
In a backyard garden in the residential area of the Universidade Federal Rural do Rio de Janeiro (UFRuralRJ) in Seropédica, RJ, there was a row of trees of Surinam cherry (Eugenia uniflora L.). The city of Seropédica is in the southeast of Brazil at 22o 46'S latitude, 43o 41'W longitude and 33m above sea level. The climate is defined as humid-warm, with mean annual temperature of 22.7oC, 1200 mm rainfall, and with a summer rainy season (FIDERJ 1976). In February 1998, a sample of 1,000 fly-infested fruits of Surinam cherry was randomly collected from the ground under the trees. These fruits were divided in four samples of 250 fruits each. Each sample was placed in a plastic tray of 40 by 30 by 6 cm with perforated bottom on a 2-cm layer of slightly moistened sand. The trays were placed at ground level under the tree canopy. To avoid predation by ants, the trays were placed on the top of aluminum cans, with their bases dipped into a solution of water plus detergent held in plastic bowls. The fruit samples stayed in the field for 15 days when most of the tephritid larvae had pupated. Afterwards they were transported to the laboratory of the "Centro Integrado de Manejo de Pragas Urbanas e Rurais Cincinnato Rory Gonçalves" (CIMPUR CRG), at the UFRuralRJ. In the laboratory, the fruits were placed in plastic sieves, which in turn were placed on top of 5-liter plastic buckets with a 15-cm layer of sand at the bottom as pupation substrate. Sand from the trays and the buckets was sifted to remove larvae and/or pupae, which were counted and transferred into 250-ml plastic cups partially filled with a 2-cm layer of slightly moistened sand. The cups were placed in 2-liter plastic containers with screened lids to hold flies and parasitoids after emergence, but every second day they were inspected to ascertain if the sand needed to be remoistened.
Fly and parasitoid emergence was checked every day for a period of 30 days after pupation. The adults of both were maintained alive for two to three days to get their color fixed, then killed, counted and preserved in vials filled with 70% alcohol for posterior identification. The species of Anastrepha and parasitoids (Braconidae and Figitidae) were identified using taxonomic keys and available descriptions (Canal Daza et al. 1994, Guimarães 1998, Zucchi 2000). Some Eucoilinae specimens were sent to Jorge A. Guimarães (ESALQ/USP, Departamento de Entomologia, Piracicaba, SP, Brazil) and Pteromalidae specimens to Systematic Entomology Laboratory (SEL/USDA, Beltsville, Maryland, USA), for conclusive identification. Diapriidae specimens were identified by Dr. Marta S. Loiácono (Departamento Científico de Entomologia, Museo de La Plata, La Plata, Buenos Aires, Argentina). Voucher specimens of fruit flies and parasitoids were placed in the entomological collection of CIMPUR CRG (Tephritidae, Braconidae and Eucoilinae), U.S. National Museum (Pteromalidae) and Museo de La Plata (Diapriidae).
A total of seven hymenopteran parasitoid species were identified: Doryctobracon areolatus (Szépligeti), Utetes (Bracanastrepha) anastrephae (Viereck), Opius bellus Gahan (Braconidae: Opiinae), Aganaspis pelleranoi (Brèthes) (Figitidae: Eucoilinae), Coptera haywardi Loiácono (Diapriidae: Diapriinae), Spalangia endius Walker and P. vindemmiae (Pteromalidae). One unidentified species of Eurytomidae was also recovered. Two species of Anastrepha were identified: A. fraterculus (Wiedemann) and A. sororcula Zucchi. The first fly species was more abundant, representing 87% of all tephritids. Most of the parasitoids (95.7%) were Braconidae. Specimens of the Figitidae, Diapriidae and Pteromalidae represented less than 5% of all parasitoids recovered (Fig. 1).
According to Johnson (1992), in the Neotropical region the genus Coptera Say includes two species: C. breviceps (Kieffer) recorded by Kieffer from the state of Pará (Brazil), and C. haywardi that was recorded from Tucumán (Argentina) (Hayward 1944, Loiácono 1981) and was recently recorded from central Mexico (López et al. 1999). Therefore, this is the first record of C. haywardi in Brazil (Fig. 2). This species was named in litteris as Galesus haywardi by Dr. A. Ogloblin, but he has not described it. This species was originally described by Loiácono in 1981 as C. haywardi (Loiácono 1981, Johnson 1992).
Various species of Coptera are known as parasitoids of species belonging to a number of families of Diptera, including fruit flies (Tephritidae) of economic importance (Muesebeck 1980). Hayward (1944) reported C. haywardi (as G. haywardi, MS.) from puparia of A. fraterculus. Loiácono (1981) mentioned this diapriine in the monophagous A. schultzi Blanchard in Tucumán. In Veracruz, México, C. haywardi was reared from Mexican fruit fly, A. ludens (Loew), infesting citrus (López 1996). In 1997 C. haywardi was discovered in Venezuela attacking pupae of A. serpentina and A. striata Schiner whose larvae were reared in fruits of Chrysophyllum cainito (L.) and Spondias mombin (L.) (García & Montilla 2001). In the laboratory this parasitoid was able to develop in pupae of A. obliqua (Macquart) (García & Montilla 2001). A study on the bionomics of pupal parasitoids of tephritid fruit flies showed that C. haywardi developed in four species of Tephritidae [A. suspensa, A. ludens, Ceratitis capitata (Wiedemann) and Toxotrypana curvicauda (Gerstaeker)], but not in species of other families (Muscidae, Calliphoridae, Tachinidae and Drosophilidae) (Sivinski et al. 1998). Unlike many common, polyphagous, ectoparasitic, pteromalid and chalcidoid pupal parasitoids of cyclorrhaphous Diptera, C. haywardi develops as an endoparasitoid (Sivinski et al. 1998), and this could explain its narrower host range (Godfray 1994). According to Muesebeck (1980), species of Tephritidae are the most common hosts of Coptera species.
Several studies have suggested that augmentative releases of parasitoids have great potential for reducing Tephritidae pest population (Wong & Ramadan 1987, Knipling 1992, Wong et al. 1992). Typically, braconid parasitoids of larvae, such as Diachasmimorpha longicaudata (Ashmead), are employed. However, pupal parasitoids might be useful additions to such programs since they are able to attack flies that might otherwise escape parasitism at larval stage. If so, specialized pupal parasitoids are particularly valuable in augmentative releases since they are less likely to harm beneficial insects and more likely to focus their foraging on a small number of target pests (Menezes et al. 1998). In this context, C. haywardi has potential to be a good candidate for biological control of tephritid pests.
We thank the Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro - FAPERJ (Project # E-26/150.471/97) and the Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq (Project # 523495/96-0) for supporting the first and second authors with a scholarship, respectively. We would like to thank Dr. E. Eric Grissell (Systematic Entomology Laboratory, USDA, Beltsville, MD) and Jorge A. Guimarães (ESALQ/USP, Departamento de Entomologia, Piracicaba, SP) for identifying the Pteromalidae and Eucoilinae species, respectively. This manuscript was approved for publication by the Head of Research and Development of Embrapa Agrobiologia as manuscript number 02/2002.
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