info:eu-repo/semantics/article
Effects of exposure time and ratio of irradiated larvae from three medfly strains on progeny yield in Diachasmimorpha longicaudata (Hymenoptera: Braconidae) mass rearing
Fecha
2020-04Registro en:
Carta Gadea, Silvia Lorena; Suárez, Lorena; Buonocore Biancheri, María Josefina; Murúa Bruna, Albérico Fernando; Molina, Diego Alejandro; et al.; Effects of exposure time and ratio of irradiated larvae from three medfly strains on progeny yield in Diachasmimorpha longicaudata (Hymenoptera: Braconidae) mass rearing; Taylor & Francis Ltd; Biocontrol Science and Technology; 30; 6; 4-2020; 592-601
0958-3157
CONICET Digital
CONICET
Autor
Carta Gadea, Silvia Lorena
Suárez, Lorena
Buonocore Biancheri, María Josefina
Murúa Bruna, Albérico Fernando
Molina, Diego Alejandro
Laria, Osvaldo
Ovruski Alderete, Sergio Marcelo
Resumen
An augmentative biological control strategy against Ceratitis capitata (= medfly) in fruit-producing irrigated-valleys of San Juan, central-western Argentina, has been recently implemented by the San Juan Fruit Fly Control and Eradication Program. The Asiannative parasitoid Diachasmimorpha longicaudata is currently reared at the San Juan Medfly and Parasitoids Mass Rearing Facility for this purpose. In this regard, the objective of this study was to evaluate adult emergence and offspring sex ratio to improve parasitoid production. Three medfly strains at different host larvae densities and exposure times to female parasitoids were assessed. Prevalence of superparasitism was also considered. Three parasitoid population lines were used in the trials: one reared on medfly larvae of the Vienna-8 temperature-sensitive lethal (tsl) genetic sexing strain without inversion, and the other two on larvae of biparental medfly strains native to San Juan (central-western Argentina) and Tucumán (northwestern Argentina). Gamma-irradiated 6 d-old larvae (early third-instars) of each medfly strain were exposed to parasitoids for 30, 60, 90, and 120 min at 3:1, 6:1, and 9:1 host/parasitoid ratios. The Vienna-8 C. capitata strain was as efficient in producing parasitoids as both biparental native strains. Medfly larvae exposed to 10 female parasitoids for a relatively long time (1.30 hrs) at a high ratio (6? 9:1) of host to parasitoid were enough to achieve the highest mean adult emergence (50?60%) and a female-biased offspring sex ratio. Superparasitism positively influenced female parasitoid production. These findings may be used to develop a more costeffective mass rearing method for D. longicaudata.