Almost the entire damage is caused by the larvae that feed on the inner tissues of host palm near the crown or some part of the trunk region. In coconut the damage is towards the upper portion of trunk but in date palm the damage is more at the base of the trunk. The external symptoms produced by the pest attack include the presence of small bore holes on the stem, oozing out of brown viscous liquid, spit out chewed tissue fibers and longitudinal splitting of leaf bases. Sometimes the trunk becomes hollow with severe damage to the inner tissues. In the final stages the crown gets toppled as a result of severance of crown from main stem.