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Abstract
The incidence and severity of resinous stem canker disease were investigated in hinoki (Chamaecyparis obtusa) and sawara (C. pisifera) at a progeny test located in Yamatsuri Town, Fukushima Prefecture, Japan. Symptoms of the disease were observed in 307 trees out of 933 investigated trees (32.9%). The damage was more severe on lower slopes than on upper slopes, indicating that micro-environmental factors are causally associated with the occurrence of the disease. The severity of the disease varied both among nine open-pollinated progenies derived from hinoki plus-tree clones and among 13 progenies derived from pollination between hinoki plus-tree clones and the mixed-pollen of hinoki plus-tree clones. The severity of the disease also varied with height above the ground. This tendency was most obvious where the disease was most severe. An estimation of the narrow sense heritability,h2, of 0.214, was obtained from analysis of the 13 progenies derived from pollination with mixed-pollen. The heritability derived from material that had not been subjected to selection against the disease, indicated that breeding to enhance resistance would be possible to control the disease. The interaction between environments and progenies in relation to severity of the disease is also discussed.