This is an introductory paper on the outbreak of Scleroderris canker of Todo‐fir (Abies sacbalisnensis Mast.) in Hokkaido, northern Japan. Symptoms, distribution of the disease, and features of infected plantations are described. The variability of disease intensity is also described.
Ascospore and pycnospore discharge and germination were examined. The causal fungus was psychrophilic, with an optimum growing temperature of 10 °C. Pathogenicity to Abies sachalinensis was ascertained by artificial inoculation, and symptoms were induced also by spraying a pyenospore suspension on to untreated shoots.
Disease development and severity of Scleroderris canker of Todo‐fir in Hokkaido vary according to forest type. Todo‐fir under a canopy of deciduous species are almost free from canker, whereas in the open they are severely attacked. The situations are described with relation to environmental conditions associated with canker development.
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