Effect of host tree activity on the rate of yolk protein deposition in Dendroctonus rufipennis (Coleoptera: Scolytidae)

Sahota, TS.; Ibaraki, A.

Canadian Entomologist 11112: 1319-1323


ISSN/ISBN: 0008-347X
DOI: 10.4039/ent1111319-12
Accession: 000640873

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A comparison of the rates of deposition of yolk protein (as inferred from rates of incorporation of leucine in ovarial yolk proteins) was made between females of Dendroctonus rufipennis (Kby.) caged on living white spruce trees [Picea glauca] in British Columbia and others on freshly cut logs of the same species. Samples coinciding with the exudation of resin into the beetle galleries by the living trees revealed significant inhibition of the rate of yolk deposition, as compared with those on cut logs. One concept of trap trees for managing bark-beetle populations relies on reducing brood production, and since yolk deposition is basic to the reproductive process, these results are important as a measure of the resistance of the living tree to beetle brood production. It is suggested that measuring yolk deposition is a better method than counting total oviposition for investigating the effects of various factors on reproduction.