Forestry management of deciduous broad-leaf stands having high risk of herbivore insect damage.

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Questionnaire research demonstrated that emperor moths distributed all parts in Hokkaido, Aomori, Akita and Iwate, Japan. Bioassay test demonstrated that survival rate and growth rate of emperor moth larvae feeding monarch birch leaves were much higher than those feeding other broad-leaf deciduous tree leaves. Additionally, growth rate of larvae feeding early leaves of adult monarch birch tree was much higher than that feeding late leaves of adult tree and both type of leaves of sampling tree. These results suggest that mature and pure stands of monarch birch like in Hokkaido have high risk of the outbreak of emperor moth. The forests in Tohoku area also have a possible risk of the outbreak of emperor moth, because the amount and age of monarch birch trees are increasing at low-managed artificial forests.