Examination for Management Cost of Mass Japanese Oak Mortality Prevention in EXPO 2005 Commemorative Park

Abstract

Damage of Mass Japanese oak mortality in Aichi Prefecture by Raffaelea quercivora was confirmed in 2005 at first, and also spreaded in EXPO 2005 Commemorative Park until 2007. In this study, the damage of Mass Japanese oak mortality in this park was investigated and the cost of pharmaceutical expense for prevents their behavior at the entire park was calculated. As a result, the mortality of Quercus serrata was 17.0% in RINSYOKAEN plot and 14.3% in SHINRINRAKUEN plot. Moreover, there are 587 trees which should inject the medicine for Mass Japanese oak mortality in the entire park, and the cost was calculated 6394400 yen as initial cost (3394400 yen for medicine injection, 3000000 yen for management of dead trees). The expansion can be prevented by executing a prior medicine injection to Q. serrata Murray subsp. mongolicoides H.Ohba. that encounters the mass attack easily and preservation value is high in this region.