The damage of wooden houses from Serpula lacrymans has increased in Japan, particularly in the northern area, Hokkaido Prefecture (See Figure 1). The weather conditions in Asahikawa have been recorded. The data obtained from the survey carried out over the five years from 1975 to 1980 were previously reported to the 5th International Biodeterioration Symposium which was held in Aberdeen, Scotland in 1981. This paper deals with the evaluation of the survey which has been extended to 7 years to 1982, and which was restricted to Asahikawa. The position of the occurrence of dry rot was inferred from the extent of the decay and/or the hyphal activity.

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