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Diachasmimorpha longicaudata originated from the Indo-Pacific region, has been widely disseminated into America via Hawaii, and can be considered successfully established in most of the importing countries, such as Colombia, Costa Rica, Guatemala, El Salvador, Mexico, Nicaragua, Trinidad, United States of America (Florida), Venezuela (Ovruski et al. 2000), and Brazil (Carvalho & Nascimento 2002). This exotic parasitoid species is the most widely employed parasitoid now in use for augmentative biocontrol programs against fruit flies in Latin America and the southern United States, primarily because it is easily mass-rearing and it adapts readily to different fruit fly species of economic importance such as Anastrepha fraterculus , A. suspensa (Loew), A. ludens (Loew), A. obliqua (Macquart), A. striata Schiner, A. serpentina (Wiedemann) and Ceratitis capitata (Sivinski 1996), (Ovruski et al. 2000). Interestingly, D. longicaudata is a common parasitoid species of Anastrepha larvae particularly in exotic commercial fruit in the state of Veracruz, México (López et al. 1999), and it may enter a dry season diapause (Aluja et al. 1998). In 1961, Argentina’s Ministry of Agriculture and Cattle, together with the National Institute of Agricultural Technology (INTA), introduced the braconid parasitoid of fruit flies D. longicaudata to the country from Mexico. This biological control program was a direct response to the establishment of the Mediterranean fruit fly, Ceratitis capitata (Wiedemann), in Argentina However, the effort also hoped to control A. fraterculus , The South American fruit fly, in several citrus-growing areas where both tephritid species coexisted in wild and commercial fruit. Diachasmimorpha longicaudata was released in 100,000 in the 1960s in the northeastern provinces of Misiones (Montecarlo county) and Entre Rios (Concordia county), in the northwestern provinces of Tucumán (San Miguel de Tucumán city) and Jujuy (Calilegua county) and the central province of Córdoba (Cruz del Eje and Yacanto counties) Turica (1968). New releases of D. longicaudata were made in citrus orchards in the Tucumán province in 1977 and 1986 (Ovruski & Fidalgo 1994). As noted by (Ovruski et al. 1999), D. longicaudata was recovered immediately following release in all sites. However, until now, there was no evidence of permanent establishment in any release site. Recent fruit fly parasitoid surveys made in Montecarlo county (Misiones province) included specimens of D. longicaudata . The first record of this species was in March 2000 attacking A. fraterculus larvae from Feijoa sellowiana L. (Myrtaceae), and it was subsequently found in February and March 2001 and April 2002 (all collection data are listed at the end of the paper), so that D. longicaudata was recovered approximately 40 years after its first release in Argentina. Thus this exotic parasitoid has become established in at least one province of Argentina, albeit in small numbers( ≈ 1% parasitism). Fruit flies and parasitoids were identified to species by the authors using Zucchi’s (2000) and Wharton and Gilstrap’s (1983) taxonomic keys, respectively. Voucher specimens were deposited in the Fundación Miguel Lillo (FML) entomological collection in San Miguel de Tucumán, Argentina.

THE ESTABLISHMENT OF DIACHASMIMORPHA LONGICAUDATA (HYMENOPTERA: BRACONIDAE) IN MISIONES, NORTHEASTERN ARGENTINA