Scolytus rugulosus, known generally as shothole borer (variously spelt hyphenated or as two words), is a species of typical bark beetle in the family Curculionidae.

[1][2][3] The shot-hole borer lives on various species of Rosaceae, especially damaged branches and trunks.

[3] They spend winter as mature larvae or pupae in tunnels just under the bark of the tree, with adults emerging in late spring (May in the northern hemisphere).

The females fly to susceptible trees where they bore into the cambium, laying eggs in pockets along the tunnel walls.

Second-generation adults emerge in summer (mid-August in the northern hemisphere).