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We present information on a poorly known native tritrophic interaction involving Celtis ehrenbergiana (Klotszch) Liebm. (Cannabaceae), the fruit fly Rhagoletotrypeta pastranai Aczél (Diptera: Tephritidae), and its parasitoid Utetes anastrephae (Viereck) (Hymenoptera: Braconidae) from Buenos Aires, Argentina. Insects were collected from 70 trees and 950 fruits and immatures were reared in the laboratory. The fruit fly accounted for 41.8% of all pupae (59 out of 141 pupae), whereas the parasitoid accounted for 32.6% of fruit www.biotaxa.org/RSEA. ISSN 1851-7471 (online) Revista de la Sociedad Entomológica Argentina 78(3): 29-32, 2019 Copyright PALACIO, F.X. et al.This is an open access article distributed under the terms of the Creative Commons Attribution Licence (CC BY 4.0) 29 fly pupae (46 braconids out of 141 pupae). Fruit infestation levels by the fruit fly ranged between 0 and 191 pupae/100 g of fruit (mean = 53.3 ± 55.3 pupae/100g of fruit), and percentage infestation levels ranged between 0 and 100% (mean = 18.2 ± 32.1%). Most parasitoid adults emerged after 1-2 months, whereas most fruit fly adults emerged after a 12mo diapause period. Our results show that both insects are common and abundant at our study area and, despite being non-economically important, highlight the need of studying poorly known species to gain a better insight into the ecology of biotic interactions with multiple interactors.

revista de la sociedad entomológica argentina

On a poorly known tritrophic interaction: fruit-infesting Rhagoletotrypeta pastranai Aczél (Diptera: Tephritidae) and its parasitoid Utetes anastrephae (Viereck) (Hymenoptera: Braconidae) in Celtis ehrenbergiana (Klotzsch) Liebm. (Rosales: Cannabaceae) fruits