In Southeastern Missouri, 66 oaks,Quercusspp., infected with the oak wilt fungus,Ceratocystis fagacearum(Bretz) Hunt, were girdled, felled, or left untreated. Effects of these treatments on attacks by oak bark beetles,Pseudopityophthorusspp., were determined. All trees were attacked by bark beetles. The beetles made brood galleries in 41 of 44 girdled and felled wilt trees but made them in only 11 of 22 untreated wilt trees.