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Bioenergetics of the granary weevil, Sitophilus granarius (L.) (Coleoptera: Curculionidae)



Bioenergetics of the granary weevil, Sitophilus granarius (L.) (Coleoptera: Curculionidae)



Canadian Journal of Zoology 54(5): 786-798



Cumulative energy budgets were determined for the immature and adult stages of Sitophilus granarius (L.) reared on single wheat kernels, Triticum aestivum L. Caloric values (cal/mg dry wt) for S. granarius stages reared at 30.degree. C and 70% relative humidity (RH) were 5.792 for eggs, 5.989 for third-instar larvae, 6.474 for prepupae, 5.985 for pupae and 5.975 for adults. Larval production increased exponentially from 0.13 cal in early first-instar larvae to 12.0 cal for 20 day old fourth-instar larvae and prepupae, and declined to 6.9 cal during the pupal stage. To complete development larvae consumed a mean 62.6% of a 126-cal kernel, whereas an average adult consumed over 3.5 times more than the total larval consumption. Assimilation efficiencies for larval development were similar (73.9-76.2%) at 3 temperatures, 20, 25 and 30.degree. C. Of energy consumed during larval and pupal development, 65.7% was explained by respiration. Net production efficiency was 20% for all larval stages and 48% for total egg production by an adult.

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Accession: 000301369

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DOI: 10.1139/z76-088


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