Coleoptera: Cerambycidae: Prioninae
Tilehorned Prionus (THP), Prionus imbricornis (Linnaeus); Broadnecked Root Borer (BNRB), P. laticollis (Drury)
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Coleoptera: Cerambycidae: Prioninae Tilehorned Prionus (THP), Prionus imbricornis (Linnaeus); Broadnecked Root Borer (BNRB), P. laticollis (Drury) |
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North American Range: Midwest to eastern United States.
Hosts: Hardwoods, usually living trees.
Overall Appearance: The Tilehorned Prionus is shiny, dark, reddish brown (males) to dark brown (females) and the Broadnecked Root Borer is a little larger than the Tilehorned Prionus, shiny, dark brown to black; both are coarsely punctate; and with a pronotum that has three teeth on each side. The adults are mistaken for the ALB.
Size: 22 to 47mm, or roughly ¾” to 1¾” long. The female is larger than the male.
Elytra (wing covers): Dark reddish brown to dark brown(THP); dull dark brown to black (BNRB).
Scutellum: Dark reddish brown to black.
Antennae (feelers): Females are less than ½ the body length, and males are ½ the body.
Feet/Legs: Dark reddish brown to black.
Adults Present: June to September.
What to look for: Usually there are no above ground symptoms, but there may be frass and sawdust (larval excrement/waste) at the base of the tree near the root crown. If exposed root collar and roots, will see oval holes. They are frequently found in swimming pool filters.