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Species Scolytus multistriatus - Smaller European Elm Bark Beetle

Tiny C-shaped larvae mature - Scolytus multistriatus Scolytus  - Scolytus multistriatus Dutch Elm Weevil - Scolytus multistriatus Scolytinae - Scolytus multistriatus dutch elm weevil - Scolytus multistriatus Scolytus multistriatus Beetle - Scolytus multistriatus Beetle - Scolytus multistriatus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga
No Taxon (Series Cucujiformia)
Superfamily Curculionoidea
Family Curculionidae (Snout and Bark Beetles)
Subfamily Scolytinae (Bark and Ambrosia Beetles)
Tribe Scolytini
Genus Scolytus
Species multistriatus (Smaller European Elm Bark Beetle)
Explanation of Names
Scolytus multistriatus (Marsham 1802)
2.2-3.0 mm
prominent spine on abdominal segment 2 separates S. multistriatus from S. rugulosus, the only other hardwood-infesting western scolytid. (UBC Forestry)
across US, w. Canada to c. Mexico (map)(1)
Elm (Ulmus, Ulmaceae)(1)
Life Cycle
Overwinter as larvae under bark(2)
Adults construct galleries 1-2" in length in the inner bark, grooving the surface of the wood, parallel to the grain. Eggs are deposited in niches along the gallery sides. The larvae feed, angling away from the gallery. The form cells in the bark for pupation.(2)
Life cycle in spring and summer can be completed in 35-40 days with 2 generations per year.(2)
A vector of Dutch elm disease
earliest record in our area: MA 1909(3)
Their gallery is typically unbranched and runs parallel to the grain; this distinguishes from the native elm bark beetles (Hylurgopinus rufipes) which is a Y-shaped gallery.
Internet References
Fact sheet (anon. 2011)(4)
Works Cited
1.Atkinson T.H. (200_‒2023) Bark and ambrosia beetles of the Americas
2.Eastern Forest Insects
Whiteford L. Baker. 1972. U.S. Department of Agriculture · Forest Service.
3.Exotic bark and ambrosia beetles (Coleoptera: Curculionidae: Scolytinae) in the United States: potential and current invaders
Haack R.A., Rabaglia R.J. 2013. In: Potential invasive pests of agricultural crops. Peña J.E., ed. CABI International, Wallingford, UK, pp. 48-74.
4.Forest invasive alien species (Canadian Forest Service)