Host plants or Ectinohoplia rufipes (Motschulsky) (En) were investigated in golf courses and laboratory. E. rufipes adults fed on 61 plant species of 27 families out of 101 plant species of 41 families supplied in laboratory. In addition, twenty-seven plant species in 8 families were observed to be fed on from golf courses. Thus, total number of host plants of E. rufipes were 84 species in 29 families. E. rufipes adults preferred Japanese green alder (Alnus firma) , cherry apple (Malus sieholdii), cherry (Prunus serrulata var. spontanea) and sweet oliver (Osmantus asiaticus) in golf courses . The preference of E. rufipes adults with A. firma , P. serrulata vu. spontanea and O. asiaticus was bioassayed in laboratory. E. rufies adults preferred A. firma consuming 58.1% to O. asiaticus and p. serrulata vats. spontanea. The most number of E. rufipes adults was attracted to damaged leaf of A. firma by E. rufipes representing 45.3clo and followed by artificial damaged leaf representing 26.5% , untried feeding leaf representing 12.9% and undamaged leaf representing 4.0%. More E. rufipes adults were attracted to damaged leaf of A. firma by 67.5% than artificially damaged leaf by 30.5% or undamaged leaf treated with feces of E. rufipes by 2%.