Abstract
In order to establish control measures against the cypress bark moth Epinotia granitalis Butler, we surveyed the inter-tree variation of the Japanese cedar Cryptomeria japonica D. Don in Kumamoto Prefecture for degree of infestation by examining the spatial distribution pattern of feeding scars made by larvae of the moth. The trees surveyed proved to be mono-clone by DNA analysis with RAPD markers. The spatial distribution pattern of feeding scars indicated that the infestation was not strongly concentrated to certain trees in any year, and remarkable infestation occurred almost evenly among the trees throughout the past 25 years. Thus, inter-tree variation in the degree of infestation by E. granitalis was not detected in the mono-clone stand of C. japonica. The results suggest that in Kyushu district, where most C. japonica plantations consist of mono-clonal trees, we must treat all of the trees in a stand, not only the markedly infested trees, in order to control E. granitalis.
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