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Augmentative Releases of Two Diachasmimorpha longicaudata (Hymenoptera: Braconidae) Population Lines Under Field-Cage Conditions to Control Ceratitis capitata (Diptera: Tephritidae)

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Abstract

Ceratitis capitata (Wiedemann) (Diptera: Tephritidae), known as Medfly, is a severe agricultural invasive pest in Argentinian fruit-producing regions. The native habitat disturbance and introduction and spread of exotic host plants strongly favored Medfly proliferation. This scenario is common throughout the northern subtropical citrus-growing region. Environmentally friendly strategies to suppress Medfly populations by the National Fruit Fly Control and Eradication Program have currently been taken. One of these actions involves augmentative biological control through releases of the exotic parasitoid Diachasmimorpha longicaudata (Ashmead) (Hymenoptera: Braconidae). Consequently, the hypothesis that the effectiveness of D. longicaudata females, from two different population lines, in controlling Medfly larvae progressively increases as the density of released females increases was tested. One parasitoid line derives from larvae of a biparental Medfly strain. The other hails from irradiated larvae of the genetic sexing Temperature Sensitive Lethal Vienna-8 medfly strain reared at the “BioPlanta San Juan” biofactory. Parasitoids foraged for 24 h on peaches artificially inoculated with naked lab-reared biparental Medfly larvae. Peaches were placed near the roof or on the ground in field cages. Five treatments (20, 40, 80, 160, and 320 females released) and a control (no parasitoids) for each population line were carried out throughout summer and autumn 2016. Host density (200 larvae) remained constant. At 320 released parasitoid females, both D. longicaudata population lines highly increased the Medfly mortality in both testing seasons, and foraged skillfully on peaches at both fruit height levels. These data encourage the application of augmentative biological control against Medfly.

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Acknowledgements

We thank to Patricia Colombres and Guillermo Borchia (PROIMI-CONICET) for the technical assistance. Special thanks are for the biological material provided by the “BioPlanta San Juan” mass-rearing facility belonging to the San Juan Biotechnology Center of the Dirección de Sanidad Vegetal, Animal y Alimentos, San Juan, Argentina. The Consejo Nacional de Investigaciones Científicas y Técnicas de la República Argentina (CONICET-Argentina) is also thanked for awarding a Ph. D. research scholarship to María Josefina Buonocore Biancheri.

Funding

Financial support was provided by Fondo Nacional de Ciencia y Tecnología-Agencia Nacional de Promoción Científica y Tecnológica (FONCyT-ANPCyT, Argentina) through grant PICT-2013–0604.

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MJBB, LCS, DSK, and SMO conceived the research and wrote the manuscript. MJBB and SMO conducted experiments. MJBB, LCS, and SMO analyzed data and conducted statistical analyses. All authors read and approved the manuscript.

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Correspondence to Sergio Marcelo Ovruski.

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The authors declare no competing interests.

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Buonocore Biancheri, M.J., Suárez, L.d.C., Kirschbaum, D.S. et al. Augmentative Releases of Two Diachasmimorpha longicaudata (Hymenoptera: Braconidae) Population Lines Under Field-Cage Conditions to Control Ceratitis capitata (Diptera: Tephritidae). Neotrop Entomol 52, 212–226 (2023). https://doi.org/10.1007/s13744-022-00981-8

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  • DOI: https://doi.org/10.1007/s13744-022-00981-8

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