Population Parameters of Spalangia endius Walker (Hymenoptera: Pteromalidae) on Pupae of Musca domestica L. (Diptera: Muscidae)

Abstract

Parámetros Poblacionales de Spalangia endius Walker (Hymenoptera: Pteromalidae) Sobre Pupas de Musca domestica L. (Diptera: Muscidae) RESUMEN-Se determinó el incremento poblacional potencial del parasitoide Spalangia endius Walker (Hymenoptera: Pteromalidae) sobre pupas de Musca domestica L. (Diptera: Muscidae) en condiciones de laboratorio, en oscuridad a 27°C y 50 ± 10% HR. Se colocaron individualmente 30 hembras con menos de 12h de emergidas sobre 15 pupas de Musca domestica L de menos de 24h de edad, renovándolas diariamente. La supervivencia preimaginal fue del 90,3 %. La longevidad de los adultos fue estimada en 8,3 días en promedio con una tasa neta de reproducción de 24,549; tasa intrínseca de crecimiento natural de 0,119; tasa finita de crecimiento de 1,126; tiempo generacional medio de 28,162 días y tiempo de duplicación de 5,849 días. Estos valores de los parámetros indican el alto potencial de S. endius comparadas con otras especies congenéricas. PALABRAS CLAVE: Tabla de vida, parasitoide de pupas, tasa intrínseca de crecimiento ABSTRACT-The potential increase of the parasitoid Spalangia endius Walker was determined under laboratory conditions at 27°C, 50 ± 10% RH. and 24h darkness. Thirty <12h-old females of the parasitoid were individualized with 15 Musca domestica L. pupae <24h old. Survival of S. endius immature was 90.3 %. Adult females mean longevity was estimated in 8.3 days with a net rate of reproduction of 24.549; intrinsic rate of natural increase of 0.119; finite rate of increase of 1.126; mean generation time of 28.162 days; and duplication time of 5.849 days. These values indicate the high potential of S. endius as a parasitoid of M. domestica, as compared to other congeneric species.

Populational parameters of Spalangia endius Walker (Hymenoptera: Pteromalidae) on Pupae of Musca domestica L. (Diptera: Muscidae) treated with two strains of Beauveria bassiana (Bals.) Vuil. (Deuteromycetes)

“…In a previous study (La Rossa et al 2002), the populational parameters of S. endius were obtained on pupae of M. domestica, being the r m and R 0 0.119 and 24.54, respectively, smaller than those of the controls of the present assay. Thus, the remaining humidity caused by the immersions would be able to increase those rates.…”

Parasitoidism Rate and Life Table Parameters of Aphytis diaspidis (Howard) (Hymenoptera: Aphelinidae) and Hemiberlesia lataniae (Signoret) (Hemiptera: Diaspididae)

“…Generation time, the mean time between two successive generations, proved to be significantly higher in latania scale (72.34) (Tables 4 and 5) and is interpreted as an advantage for increasing the parasitoid population (La Rossa et al, 2002).…”

Life table parameters of the woolly whitefly Aleurothrixus floccosus (Hemiptera: Aleyrodidae) and its parasitoid Cales noacki (Hymenoptera: Aphelinidae)

“…Generation time, the mean time between two successive generations is significantly longer in A. floccosus (38.769 days) than C. noacki (16.572 days) (Table 4) and this is interpreted as favourable for increasing the numbers and effect of the parasitoid (La Rossa et al, 2002).…”