Correlation between resinous disease of hinoki (Chamaecyparis obtusa) and adjoining sugi (Cryptomeria japonica) forests with special reference to the influence of hinoki bark moth on the disease occurrence
1996
Koiwa, T. (Iwate-ken. Forest Experiment Station, Takizawa (Japan)) | Kusunoki, M. | Miyashita, S. | Hasegawa, E. | Ogura, T.
Tree damage by resinous disease of hinoki cypress and number of scars caused by hinoki bark moth (Epinotia granitalis Butler) were investigated in two hinoki stands in Ibaraki prefecture to see if there was any correlation between the occurrence of resinous disease and insect attack. The type of forest adjoining the hinoki stands was found to influence the number of trees affected by resinous disease and also the number of trees with moth damage. The hinoki bark moth is known to inhabit mature sugi forests. In a 35-year-old stand of hinoki, the occurrence of resinous disease was far greater in plots adjoining sugi forests than in plots adjoining broad-leaved tree forests. In a 5-year-old stand of hinoki forest surrounded by 30-40-year-old sugi forests, the number of scars caused by the hinoki bark moth ware greater in peripheral plots near the sugi forests than in the central areas. The results of this study suggested that there is correlation between the occurrence of resinous disease and insect attack in hinoki trees, the insect damage allowing the pathogen causing resinous disease to enter the tree
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