International Journal of Tropical Insect Science (2005) 25, 6-11

A.H.M. Qumruzzaman and W. Islam (2005)
Interaction between Dinarmus basalis and Anisopteromalus calandrae (Hymenoptera: Pteromalidae) at different parasitoid densities on Callosobruchus chinensis (Coleoptera: Bruchidae) in red lentil seeds
International Journal of Tropical Insect Science 25 (1), 6-11
Abstract: Lentil seeds infested with Callosobruchus chinensis (Linnaeus) for 12-15 days were exposed to Dinarmus basalis (Rondani) alone, Anisopteromalus calandrae (Howard) alone, or to both species, at densities of 2, 4, 8, 16 and 32 insects. Intra-specific competition and host emergence decreased with increasing parasitoid density in both D. basalis and A. calandrae, but progeny production of the parasitoids and parasitoid-induced mortality (PIM) increased with increasing parasitoid density. Dinarmus basalis was much more efficient in parasitizing C. chinensis than A. calandrae. Emergence of D. basalis and A. calandrae, and the PIM were highest at a parasitoid density of 32. Parasitoid density and a combination of parasitoids significantly (P<0.01) affected the number and progeny sex ratio of emerged parasitoids. There were significant (P<0.01) effects of inter- and intra-specific competition on host mortality. Host mortality increased with increasing parasitoid density. Parasitoid combination and parasitoid density also significantly affected PIM.

Les graines de lentille infeste´es par Callosobruchus chinensis (Linnaeus) pendant 12-15 jours ont e´te´ expose´es soit a` Dinarmus basalis (Rondani), soit a` Anisopteromalus calandrae (Howard), ou encore aux deux espe`ces a` la fois, aux densite´s de 2, 4, 8, 16 et 32 insectes. La compe´tition intraspe´cifique et l'e´mergence des adultes diminuaient au fur et a` mesure de l'augmentation de la densite´ des parasitoïdes, tandis que le taux de reproduction des parasitïodes et la mortalite´ induite par les parasitoïdes (MIP) allaient de pair avec l'augmentation de la densite´ des parasitoïdes. Dinarmus basalis e´tait plus efficace a` parasiter C. chinensis que A. calandrae. Le taux d'e´mergence de D. basalis et A. calandrae, et le PIM e´taient les plus e´leve´s a` une densite´ de 32 parasitoïdes. La densite´ et la combinaison des parasitoïdes affectaient significativement (P<0,01) le nombre et le sexe ratio de la descendance. On a enregistre´ des effets significatifs (P<0,01) de compe´tition inter et intraspe´cifique sur la mortalite´ de l'hoˆte. La mortalite´ de l'hoˆte augmentait avec l'augmentation de la densite´ des parasitoïdes. La combinaison et la densite´ des parasitoïdes affectaient significativement le MIP.
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Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Callosobruchus chinensis	Stored legumes
Anisopteromalus calandrae (parasitoid)	Callosobruchus chinensis	Stored legumes
Dinarmus basalis (parasitoid)	Callosobruchus chinensis	Stored legumes