PINE SAWYERS Coleoptera Cerambycidae Monochamus sp by

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					                                                                                         PINE SAWYERS
                                                                Coleoptera: Cerambycidae, Monochamus sp.

                                                                                               by Eric Day

                                                                                  PLANTS ATTACKED: Pine, spruce, and balsam fir.

                                                                                  DESCRIPTION OF DAMAGE: They are secondary infesters whose
                                                                                  main damage is disfiguring wood by larval boring and tunneling in
                                                                                  felled trees and usable trees which are weakened or dying from other
                                                                                  causes. Plant parts attacked trunk. Damaging stage - larvae.

                                                                                  IDENTIFICATION: The adults are large cylindrical beetles, black,
                                                                                  brownish-black, or reddish brown, mottled with whitish or grayish
                                                                                  pubescence. The thorax bears a prominent spine on each side. The
        Fig. 1: Pine Sawyer adult on branch                                       larvae are elongate, cylindrical, and have large gnawing mandibles.
      [W Cranshaw, Colorado State University,                                     The larvae are legless.
LIFE HISTORY: Adult appearance coincides with the pollen release by the host plants.
Shortly thereafter they begin attacking killed and felled trees, gnawing pits through the
bark, and inserting from 1 to several eggs in each pit. Upon hatching, the larvae bore
beneath the bark and mature between 40-60 days. At this time the larvae enter the
wood and make a deep U-shaped cell through the sap and heartwood. The entrance is
plugged with frass, and the opposite end enlarged into a pupal cell. The larvae pupates
the following spring or early summer and the adult emerges the same summer.

                                                                          CONTROL: Sanitation and prompt actions are
                                                                          the best controls against these borers. Felled       Fig. 2: Pine Sawyer larvae
                                                                          timber should be removed from the woods as           [J Song and J Shi, Beijing
                                                                          soon as possible. Secondly, the bark should be          Forestry University,
                                                                          removed from the logs to prevent infestation.    ]
                                                                          Thirdly, logs may be sprayed thoroughly if storing is required.

                                                                          REMARKS: Adults are attracted to the smell of various materials with
                                                                          resin bases; turpentine, paints, etc., and are occasionally thought to be
          Fig. 3: U-shaped cells in wood                                  emerging from homes.
       [W H Bennett, USDA Forest Service,

Formerly Publication 444-215

2009                                                                 Virginia Polytechnic Institute and State University                                                                          2907-1399
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An equal opportunity/affirmative action employer. Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department
of Agriculture cooperating. Mark A. McCann, Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; Alma C. Hobbs, Administrator, 1890 Extension Program, Virginia State, Petersburg.

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