Journal of the Kansas Entomological Society (1999) 72, 440-446

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C.S. Burks, J.E. Baker and D.W. Hagstrum (1999)
Optimum host age and stage for development of Anisopteromalus calandrae (Hymenoptera : Pteromalidae) reared on the rice weevil (Coleoptera : Curculionidae) in wheat
Journal of the Kansas Entomological Society 72 (4), 440-446
Abstract: Suitability of different ages of the rice weevil Sitophilus oryzae (L.) in wheat for the development of the parasitoid wasp Anisopteromalus calandrae (Howard) was examined. Infested wheat kernels were isolated using x-ray techniques. Groups of five infested kernels of wheat were exposed to individual, A. calandrae females 16-18, 18-20, or 20-22 days following rice weevil oviposition, and kernels were dissected at 2-day intervals during the next 4-14 days. The oldest of these 3 rice weevil age groups was predominantly teneral pupae, and there was a significant difference in the tunnel widths between the younger 2 larval age groups. In this no-choice test, older rice weevils were paralyzed and parasitized more often than younger ones. All A. calandrae paralyzed and parasitized at least same hosts, suggesting that variation in behavior among females was not the primary factor in the difference between the rate at which these three age groups were parasitized. Some previous studies have found that A. calandrae parasitized larvae more often than pupae. These observations suggest that the most frequently parasitized stage in a continuous population at low density is not necessarily the optimum stage for supporting parasitoid production in high density infestations.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Charles S. Burks

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Sitophilus oryzae Stored grain
Anisopteromalus calandrae (parasitoid) Sitophilus oryzae Stored grain