Stem borer, Oberea myops Hald. Oviposit in current season's growth near tip in June or July. Larva feeds in cane, adult emerges after about three years. Shoot girdling associated with oviposition, tips wilt. As larva tunnels down, whole cane affected, leaves turn reddish-brown, drop.
Whole cane dies.
Cane may have pin holes down length with frass extruding. Woolwine et al. Remove wilted tips as soon as they appear. See additional comments on Prionus under apple . Lay eggs in crevices in bark or in partially exposed roots.