Potentiel Reproducteur de Dinarmus basalis Rond. (Hymenoptera: Pteromalidae) en Présence de Son Hôte Callosobruchus maculatus F. (Coleoptera: Bruchidae) en Zone Guinéenne

Abstract

The age-dependent fecundity and offspring production of females of a solitary ectoparasitoid Dinarmus basalis Rond. (Hymenoptera : Pteromalidae) were determined on its host Callosobruchus maculatus F. (Coleoptera : Bruchidae). The resulting data were used to determine the longevity and reproductive potential of the species, by establishing its life and fertility tables. In the presence of 16 hosts renewed every 48 hours, D. basalis females had a mean longevity of 32.6 ± 1.6 days. They laid an average of 136.5 ± 55.2 eggs, parasitised 132.7 ± 53.9 hosts, and produced 111.8 ± 3 offspring, consisting of 58.3 % of males and 41.7 for females. The total mean development time was 14.0 ± 0.7 days for females and 11.8 ± 0.8 days for males. The net reproductive rate R o was 38.9 females progeny per adult female, and the intrinsic rate of population increase (r m ) 0.16 per day. The generation time (G) was 22.5 days and the doubling time (DT) 4.3 days. These parameters permitted to determine the reproductive potential of D. basalis as a biological control agent against the bruchid in West Africa.

Influence of host origin on host choice of the parasitoid Dinarmus basalis: Does upbringing influence choices later in life?

“…It may be due to climatic conditions (temperature and relative humidity) or host availability. All experiments were carried out under a mean temperature of 32 ± 0–1° C, which, according to some authors, was among the temperatures that allowed optimal development of C. maculatus and D. basalis ( Sanon et al 1998 ; Mondedji et al 2002 ; Amevoin et al 2007 ). Considering the high variation in parasitism rates among different the strains, it can be inferred that there is a difference in sensitivity to stimuli between females raised on different plant species.…”

“…Studies using D. basalis as a biological control against legume-eating Bruchids were carried out in South Asia ( Islam and Kabir 1995 ), Latin America ( Schmale et al 2002 ; Schmale et al 2006 ), and West Africa ( Mondedji et al 2002 ; Sanon et al 2005 ; Amevoin et al 2007 ). However, studies focusing on the ability of this parasitoid to locate its host within unusual host plant seeds are scarce.…”

Parasitoid Dinarmus acutus (Hymenoptera: Pteromalidae) Parasitizing on bruchid beetle, Acanthoscelides macrophthalmus on Leucaena Tree at Alexandria, Egypt

“…These means were different according to substrate of oviposition; which was longer on pods than on seeds. The development was low at the first stages because of very hardness of the tegument of L. leucocephala seeds that can create a barrier for the perception of the first instars inside the seed (Mondedji et al, 2002). This is the main reason to describe the long development of A. macrophthalmus when the eggs are laid on pods as compared to on seeds (Effowe et al, 2010).…”

Do resource value and ownership status affect intensity and resolution of contests in a parasitoid wasp?

“…Under storage conditions, D. basalis shows a very good capacity to move through the cowpea seeds column and therefore to locate hosts (Huignard, 1996). In addition, D. basalis presents suitable life-history traits for a biological control agent: relatively long life expectancy (32.6 AE 1.6 days) and elevated reproduction rate [136.5 AE 55.2 eggs laid on 132.7 AE 53.9 hosts, resulting in the production of 111.8 AE 3 offspring over their life span (Sanon, 1997;Mondedji et al, 2002)]. In absence of interspecific competition with E. vuilleti, D. basalis thus shows a higher parasitism rate and causes greater decrease in host density than its interspecific competitor alone (Monge et al, 1995).…”