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The present study investigated under laboratory conditions the use of entomopathogenic nematodes strains separately or in combinations, as biological control agent of Mediterranean fruit fly, Ceratitis capitata Wied. (Diptera, Tephritidae). In the first bioassay, eight strains were used separately (Steinernema carpocapsae NCALL, Heterorhabditis bacteriophora HP88, H. baujardi LPP7, H. indica LPP1, H. indica LPP14, H. sp. LPP9, H. sp. LPP17 e H. sp. LPP12). For each treatment, 20 test tubes with sand, 10 larvae of C. capitata and 100 infective juveniles (IJs) diluted in 1 cm 3 of distilled water were used. In the treatment control only 1 cm 3 of distilled water was added. In the second bioassay it was used the same material; however, the number of C. capitata larvae was reduced to five and strains of nematodes combined in pairs, in a total of 100 IJs per replicate (50 individuals of each strain). All treatments were stored in an incubator for 15 days (28 oC, 80% RU and 12 h photoperiod). The average mortality of larvae L3 was evaluated by Tukey test at 1%. The strains H. baujardi LPP7, H. indica LPP14, H. sp. LPP17 and H. sp. LPP12 were the most efficient ones, reaching mortalities range between 75 and 98.5%. In the second experiment, the most effective combinations were H. indica LPP14 + H. sp. LPP9 and H. sp. LPP17 + H. sp. LPP12 with mortality of 60 and 82%, respectively. We concluded that the use of NEPs in the biological control of C. capitata is a feasible alternative either using species separated or in combination, but the first one may reach higher mortality. Key-words: mortality; juveniles; pairs; biocontrole; Tephritidae

CONTROLE BIOLÓGICO DA MOSCA-DO-MEDITERRÂNEO Ceratitis capitata UTILIZANDO NEMATOIDES ENTOMOPATOGÊNICOS EM LABORATÓRIO