Frugivorous flies and their parasitoids associated with Surinam cherry fruits Moscas frugívoras e seus parasitoides associados a frutos de pitanga

Arq. Inst. Biol., v.83, 1-5, e0112014, 2016 RESUMO: O objetivo deste estudo foi conhecer e avaliar a infestação natural por moscas frugívoras (Diptera: Tephritidae e Lonchaeidae) e seus parasitoides em frutos de pitanga. O levantamento foi conduzido em pomar orgânico, localizado no município de Maceió, Alagoas. Nos meses de outubro de 2010 a janeiro de 2011, coletaram-se frutos de pitanga verdes, “de vez” e maduros. O índice de infestação foi maior nos frutos verdes e “de vez”. Foram identificadas cinco espécies de moscas frugívoras: Anastrepha fraterculus, Anastrepha obliqua, Anastrepha sororcula, Ceratitis capitata (Diptera: Tephritidae) e Neosilba pendula (Diptera: Lonchaeidae). Identificaram-se as espécies de parasitoides: Doryctobracon areolatus, Opius bellus, Utetes anastrephae e Asobara anastrephae (Hymenoptera: Braconidae), sendo D. areolatus com maior porcentagem de parasitismo em todos os estágios de maturação. Registra-se no Brasil a associação entre N. pendula e Eugenia uniflora L. (Myrtaceae). Relatam-se também pela primeira vez as ocorrências de O. bellus, U. anastrephae e A. anastrephae no estado de Alagoas. Em pitanga, os frutos verdes e “de vez” foram mais infestados por moscas-das-frutas, e a porcentagem de parasitismo foi maior em frutos “de vez” e maduros.


ABSTRACT:
The aim of this study was to know and assess natural infestation of frugivorous flies (Diptera: Tephritidae and Lonchaeidae) and their parasitoids in Surinam cherry fruits.The survey was conducted in an organic orchard, located in the municipality of Maceió, Alagoas.From October 2010 to January 2011, mature green, half-ripe and ripe Surinam cherry were collected.Infestation index was higher for mature green and half-ripe fruits.Five species of frugivorous flies were identified: Anastrepha fraterculus, Anastrepha obliqua, Anastrepha sororcul, Ceratitis capitata (Diptera: Tephritidae), and Neosilba pendula (Diptera: Lonchaeidae).It were identified the parasitoids: Doryctobracon areolatus, Opius bellus, Utetes anastrephae and Asobara anastrephae (Hymenoptera: Braconidae), being D. areolatus with highest percentage of parasitism in all maturation stages.N. pendula was recorded in Brasil associated to Eugenia uniflora L. (Myrtaceae).O. bellus, U. anastrephae and A. anastrephae were also recorded for the first time in the State of Alagoas.Mature green and half-ripe Surinam cherries are the most fruit fly infested, and the parasitism rate is higher in halfripe and ripe fruits.KEYWORDS: Diptera; Tephritidae; Lonchaeidae; Braconidae.
The Surinam cherry tree (Eugenia uniflora L.) (Myrtaceae) is attacked by several pests, being trunk and stem borers, fruit flies and leaf-cutting ants among the main ones (Fraife Filho et al., 2013).Fruit flies of Tephritidae family, mainly Anastrepha genus and the species Ceratitis capitata (Wiedemann, 1824), are the major phytosanitary problem of Brazilian fruit culture because they cause high yield losses and chemical control is expensive.These insects cause losses of US$ 120 million a year for Brazilian fruit market and US$ 2 billion to world fruit production (Moscamed, 2012).
Injuries inflicted by fruit flies are not only caused by oviposition in fruits but also by the larval feeding habits that consist of perforation inside fruits, causing modification of taste, early maturation, fruit decaying and their fall (Aguiar-Menezes et al., 2004).Depending on the fructiferous plant species, the wounding caused by fly oviposition can be entrance for fungi and bacteria (Santos et al., 2008).
In Alagoas State, knowledge about the tephritid fauna is poor, and the information available is limited to a few sites.In this context, surveys of fruit flies species need to be intensified in the region as they are of great importance for a better understanding of tephritids and therefore they serve as basis for future studies of other areas of knowledge, such as Ecology, Biology and even establishing control programs.
Yet there are good perspectives of Surinam cherry for commercial use, there is little information available on damage caused by fruit flies.Within this context, this study aimed at knowing and assessing the natural infestation of frugivorous flies (Diptera: Tephritidae and Lonchaeidae) and their parasitoids in Surinam cherry fruits E. uniflora L. in the municipality of Maceió, Alagoas, Brazil.
The study was conducted in Surinam cherry organic orchards, located in the municipality of Maceió, Alagoas, Brazil (9º40'S, 35º42'W, altitude 110 m).Three collections were performed during the period within October 2010 and January 2011.The fruits were randomly collected in different heights and maturation stages: mature green (green peel), half-ripe (orange peel) and ripe (red peel).Sample size was variable and dependent on fruit availability.Samples were sent to "Laboratório de Entomologia do Centro de Ciências Agrárias (CECA)" at Universidade Federal de Alagoas (UFAL), Rio Largo, Alagoas, where they were cleaned with water and sodium hypochlorite (1%), weighed and placed in plastic pots with sterile sand (substrate for pupation).
Pupae were individualized after 15 days of packaging fruits.Fruit fly adults and their parasitoids were preserved in ethanol 70% and then identified.A dichotomous key based on female aculeus basis was used to identify the flies, in accordance with Malavasi;Zucchi (2000).For parasitoids, identification was based on wings and mouth parts (Canal;Zucchi, 2000).The Lonchaeidae were identified by MSc.Pedro Carlos Strikis (Universidade Estadual de Campinas, São Paulo, Brazil).
Infestation index was calculated dividing the number of pupae by the number of collected fruits.Parasitism was estimated by the formula P= (parasitized pupae/total number pupae) x 100.
Out of 750 Surinam cherries, 714 fruit fly puparia were collected, from which 372 flies emerged, 311 of Tephritidae family (147 ♀ and 164♂) and 61 Lonchaeidae (38♀ and 23♂) (Neosilba sp.).From Tephritidae, 99.7% belonged to Anastrepha genus and 0.3% was C. capitata.Five fruit fly species were identified: A. fraterculus, A. obliqua, A. sororcula, C. capitata and N. pendula.The fruit flies A. fraterculus, A. obliqua and N. pendula were found in fruits of all maturation stages.A. fraterculus and N. pendula were found in higher numbers in mature green and half-ripe fruits, while A. obliqua was more abundant in mature green Surinam cherries.A. sororcula was found both on mature green and half-ripe Surinam cherries, but it was predominant in green.Only one C. capitata individual was collected that emerged from a ripe Surinam cherry (Table 1).
It was observed a decrease of infestation index with the advance of Surinam cherry maturation.The infestation index was higher for mature green and half-ripe Surinam cherries, which were of 1.13 and 1.18 puparia/fruit, respectively.The index for ripe fruits was drastically reduced to 0.55 puparia/ fruit (Table 2).This study shows that there is a trend of frugivorous flies preferentially infesting mature green E. uniflora.
Bomfim et al. ( 2010), who studied fruit fly infestations in umbu-cajá, found that A. obliqua was predominant in fruits of all maturation stages.By comparing this data with the one from current study, it is inferred that the same Tephritidae species is able to infest fruits of different maturation stages in other host species.
The species D. areolatus was found in higher numbers in all maturation stages, corroborating results of Gonçalves et al. (2006) that affirmed the species is the most abundant in Alagoas State.D. areolatus is the most common parasitoid species of Anastrepha in Brazil (Ohashi et al., 1997;Silva;Silva, 2007).This species is widespread and abundant among puparium parasitoids of Tephritidae (Leonel Júnior et al., 1995;Araújo et al., 1996;Bittencourt et al., 2012).Predominance of D. areolatus is related not only to its ability in locating and parasitizing but also to the capacity of parasitizing young larvae, and therefore being earlier than other parasitoids (Carvalho, 2005).The parasitoid O. bellus was also present in Surinam cherries of all maturation stages, although the parasitoid preferred mature green and half-ripe fruits.
The lowest parasitism rate was obtained in mature green Surinam cherries probably due to the underestimation or absence of larval parasitoids, once the fruits were harvested earlier and then was exposed to parasitism for a shorter time than cherries from advanced maturation stages (Stark et al., 1991).Furthermore, an important factor in the parasitism rates of Tephritidae flies is the fruit maturation stage, being mature green the ones most resistant to parasitism (Hernández-Ortiz et al., 1994).
Surinam cherry mature green and half-ripe are the most infested by fruit flies, and the highest parasitism rate was found in half-ripe and ripe fruits.N. pendula was recorded for the first time in Brazil associated to E. uniflora.O. bellus, U. anastrephae and A. anastrephae in the State of Alagoas.Therefore, expands the known geographic distribution of N. pendula in E. uniflora for Brazil, well as of the natural enemies to state of Alagoas.

Table 3 .
Number and parasitism rate of parasitoid species, emerged from fruit fly puparia from three maturation stages of Surinam cherry.Maceió, Alagoas, from October 2010 to January 2011.