Borers are the larvae of beetles and moths. Throughout the summer season the females will lay their eggs in the bark. Larvae live off of the heartwood, bark and sapwood of the tree. This causes the stopping of nutrients and water to flow in the area. They dig tunnels or holes into the branches or trunks of trees. The foliage on the branches or at tops of the tree is sparse, and twigs and branches eventually die from these insects. The bark dies over the tunnels and fall off showing the trails. Sawdust like material and sap surrounds the openings of holes. The trees become weak and can break during windstorms. Newly transplanted, young or weak trees are more susceptible to being killed or having injury.