Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes



Species Plectrodera scalator - Cottonwood Borer

Cottonwood Borer - Plectrodera scalator White / Black Beetle? - Plectrodera scalator Cotton Borer - Plectrodera scalator Cotton Borer - Plectrodera scalator Black and White Insect with Long Slender Body and Long Antennae - Plectrodera scalator Cottonwood Borer - Plectrodera scalator Beetle-like mystery.  - Plectrodera scalator Plectrodera scalator
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga
No Taxon (Series Cucujiformia)
Superfamily Chrysomeloidea (Longhorn and Leaf Beetles)
Family Cerambycidae (Longhorn Beetles)
Subfamily Lamiinae (Flat-faced Longhorn Beetles)
Tribe Monochamini
Genus Plectrodera
Species scalator (Cottonwood Borer)
Synonyms and other taxonomic changes
Plectrodera scalator (Fabricius)
Orig. Comb: Lamia scalator Fabricius, 1792
Monotypic genus (1)
22-40 mm
mostly sc. US - Map (2)(3)
Areas with hostplants (poplars, willows), typically riverbanks
Mostly: May-Sept (3)
Populus, Salix, Platanus (cottonwood, willow, sycamore)
Life Cycle
Eggs are laid in August, September. Larvae bore at the base of poplars, willows, and overwinter. Two or three years required to reach maturity. Larvae may girdle trees. Pupation occurs in chambers beneath bark. Adults are reported to browse on shoots of host trees, especially leaf-stems (petioles), and bark.

Eggs are deposited in pits chewed in the bark below the ground line at the base of the tree. The larvae feed in the phloem, mining downward and entering the root by fall. The 2nd summer they excavate galleries pushing out frass through holes near the egg slits.(4)
Print References
Yanega, p. 130, fig. 349 (5)
Arnett, p. 309, fig. 725 (6)
Internet References
Texas Entomology - Mike Quinn, 2008
Works Cited
1.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.
2. A distributional checklist of the beetles (Coleoptera) of Florida.
Peck & Thomas. 1998. Florida Department of Agriculture and Consumer Services, Gainesville. 180 pp.
3.Global Biodiversity Information Facility (GBIF)
4.Eastern Forest Insects
Whiteford L. Baker. 1972. U.S. Department of Agriculture · Forest Service.
5.Field Guide to Northeastern Longhorned Beetles (Coleoptera: Cerambycidae)
Douglas Yanega. 1996. Illinois Natural History Survey.
6.How to Know the Beetles
Ross H. Arnett, N. M. Downie, H. E. Jaques. 1980. Wm. C. Brown Publishers.