Abundance of Anastrepha fraterculus (Diptera: Tephritidae) and its Associated Native Parasitoids (Hymenoptera) in “Feral” Guavas Growing in the Endangered Northernmost Yungas Forests of Argentina with an Update on the Taxonomic Status of Opiine Paras.....

OVRUSKI, S.M.; R. A., WHARTON; P., SCHLISERMAN Y M., ALUJA; OVRUSKI, S.M.; R. A., WHARTON; P., SCHLISERMAN Y M., ALUJA

Environmental Entomology

Allen Press, Inc.

Lugar: Kansas; Año: 2005 vol. 34 p. 807 - 818

0046 225X

  We report the results of a two year survey aimed at determining the identity and abundance of native parasitoids of fruit infesting tephritids attacking Psidium guajava L. (common guava) in the endangered northernmost Yungas forests of Argentina which are being encroached by commercial citrus groves.  The 3,200 guavas collected during the peak of the short guava fruiting period (February and March), yielded 10,701 Anastrepha fraterculus (Wiedemann) and Ceratitis capitata (Wiedemann) adults (97.4 and 2.6%, respectively) and 712 native parasitoids.  The parasitoid species and proportion in the total sample during the two-year study period were as follows: Doryctobracon areolatus (Szépligeti) (37.9%), Doryctobracon brasiliensis (Szépligeti) (17.7%), Utetes anastrephae (Viereck) (10.0%), Doryctobracon crawfordi (Viereck) (1.1%), Opius bellus Gahan (0.7%) (all Braconidae, Opiinae), and Aganaspis pelleranoi (Brèthes) (32.6%) (Figitidae, Eucoilinae).  All parasitoids emerged from A. fraterculus pupae (i.e., none from C. capitata).  The discovery of D. crawfordi represents the first report for Argentina and the southernmost record for the species.  We discuss the practical implications of the role of guava as a reservoir for A. fraterculus and the implications for the biological control of both fruit flies.  We also update on the taxonomic status of the opiine parasitoids of A. fraterculus in Argentina.  A number of species previously reported in the literature had never been formally described (i.e., represent nomina nuda) or had been misidentified.