PROIMI   05436
PLANTA PILOTO DE PROCESOS INDUSTRIALES MICROBIOLOGICOS
Unidad Ejecutora - UE
artículos
Título:
OFFSPRING IN RESPONSE TO PARENTAL FEMALE DENSITIES IN THE FRUIT FLY PARASITOID DIACHASMIMORPHA LONGICAUDA (HYMENOPTERA: BRACONIDAE, OPIINAE)
Autor/es:
PARANHOS, B.J.; COSTA, M DE L. Z.; OVRUSKI, S. M.; ALVES, R. M.; BLUMMER, L.; WALDER, J. M. M.
Revista:
FLORIDA ENTOMOLOGIST
Editorial:
Lubrecht & Cramer
Referencias:
Lugar: P.O. Box 3110, Port Jervis, NY, USA; Año: 2008 vol. 91 p. 628 - 635
ISSN:
0015-4040
Resumen:
As part of an evaluation of the braconid parasitoid Diachasmimorpha longicaudata (Ashmead) as a biocontrol agent of Ceratitis capitata (Wiedemann) in Brazil, the aims in the current study were to find the best parental ratio of females to males in the rearing cages in order to get the highest female biased offspring in the parasitoid rearing process, and to verify the parasitism efficiency on C. capitata according to parental female densities. Three treatments were assessed: T1 (20 females: 20 males), T2 (60 females: 20 males) and T3 (100 females: 20 males). Ten late-third instars of C. capitata were offered daily to each female parasitoid from the 1st to the 12th day of age. The parental female productivity, fecundity, offspring sex ratio, percentage of parasitoid emergence, and daily mortality of parental females and males at different female/male densities were evaluated. The results indicated that numbers higher than 20 parental females did not affect offspring sex ratio, overall offspring production, nor the percent parasitism. Female biased offspring were  found for all three parental female/male ratios analyzed in this study, except that predominately males developed from parasitoid eggs laid in the age interval 1-2 days post emergence. Higher parasitoid female productivity and fecundity were found at the 1:1 female/male per cage density whereas lower productivity and fecundity were recorded at the 5:1 female/male ratio. A higher female/male ratio in the parental cages increased the mortality rate of females but did not significantly influence the total number of parental male deaths. The results of the current study on progeny production efficiency of D. longicaudata females may facilitate the advancement of an optimum mass-rearing  system using C. capitata for this parasitoid species in Brazil.