California Root Borer
( Prionus californicus )


2010-0814-01080149-COL00003-Prionus_californicus[1117h20s,P,A,fwdlaterum]{EXD}-G.jpg

PHOTO COMMENT

IDENTIFICATION
Identification:Prionus californicus
(Motschulsky ,1845 )
Common Name:California Root Borer
Life Stage:(A) adult

PHYLOGENY

Phylum:Arthropoda
Class:Insecta
Superorder:Holometabola
Order:Coleoptera
Suborder:Polyphaga
Family:Cerambycidae
Subfamily:Prioninae
Tribe:Prionini
Genus:Prionus
Taxon Code:COL00003
ITIS/TSN:703175

LOCATION DETAILS
Location Name
Sycamore Grove/Veteran's Park, Sycamore Grove/Veteran's Park, 5211 Arroyo Road, Livermore
County:Alameda County
ECI Site#:CA01080149

RECOGNITION
Recognition
The following is from Evans & Hogue. Adults: Robust, reddish-brown to almost black; three sharp spines on each side of pronotum; saw-toothed antennae with 12 segments (scape, pedicel, and 10 flagellomeres...pedicel very short, 1st flagellomere longest, then decreasing in size apically). Males with antennae distinctly sawlike, more than 2/3 length of body. Females with more slender antennae, about 1/2 length of body.
Description
The following is from Evans & Hogue. Adults: Robust, reddish-brown to almost black; three sharp spines on each side of pronotum; saw-toothed antennae with 12 segments (scape, pedicel, and 10 flagellomeres...pedicel very short, 1st flagellomere longest, then decreasing in size apically). Males with antennae distinctly sawlike, more than 2/3 length of body. Females with more slender antennae, about 1/2 length of body.
Body Length
Larvae: Up to 80mm long
Similar Taxa
The Ponderous Pine Borer (Trichocnemis spiculatus) is similar in size.

BIOLOGY
Food
Larva feed primarily on living deciduous trees (oaks, madrone, cottonwood) and are also recorded from roots of vines, grasses, and decomposing hardwoods and conifers. Will also attack fruit trees growing on light, well-drained soils (e.g. apple, cherry, peach)
Active Period
Adults are active from the summer through early fall. Adults fly at dusk or in the evening and are attracted to lights.

CREDITS
Photographer
Eddie Dunbar
Insect Sciences Museum of California

References
Species Prionus californicus - California Root Borer. (http://bugguide.net/node/view/18882). Accessed March 12, 2016. .
ITIS.


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