スギ生立木に接種されたスギカミキリ幼虫の密度と生存の関係

概要

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The effects of the host-tree defensive reaction and natural enemies on the larval mortality of the cryptomeria bark borer, Semanotus japonicus was examined by inoculation of newly-hatched larvae at different densities on 32 living Japanese cedar trees, Cryptomeria japonica half of which were screened to prevent attacks by natural enemies. Mortality duc to natural enemies was not significant before the larvae began feeding on the sapwood, but appeared to be heavy during the phloem-sapwood feeding period. On screened trees, excluding two killed trees, the densities of larvae tended to become constant irrespective of the initial density at the starting time of feeding on the sapwood and at the completion of pupal chambers in the wood. Consequently, the survival rates decreased with increasing density. A hypothesis based on a time-delayed defensive reaction by host trees and variation in larval growth could explain the convergence of the larval densities.
日本応用動物昆虫学会の論文
1996-02-25