Pest Profile

Photo credit: Kansas Department of Agriculture, Bugwood.org Licensed under a Creative Commons Attribution-Noncommercial 3.0 License

Common Name: Carrot

Scientific Name: Tamorus (Ligyrus) gibbosus

Order and Family: Coleoptera,

Size and Appearance:

Length (mm) Appearance Egg  White in color  Laid in the early spring in the soil

Larva/Nymph  Whitish blue with a brown head  C-shaped grub  Have a small knob at leading edge of the ~ 25 mm circular, cup-like depression behind its head

Adult  Reddish brown or black in color  Hard exoskeleton with small holes forming 11-23 mm lines down the back

Pupa (if  Pupation occurs in the soil applicable)

Type of feeder (Chewing, sucking, etc.): Larvae and adults both have chewing mouthparts.

Host plant/s: Sunflower, dahlia, corn, potato, beet, carrot iris, and lily.

Description of Damage (larvae and adults): Larvae feed primarily on grass and weeds but occasionally feed on crop roots. Adults feed both above and below the soil’s surface and occasionally causes damage to roots, stems, and leaves. Symptoms can include yellowing of foliage, wilting, stunting, and death from root feeding.

References: Cranshaw, W. (2004). Garden of North America: the ultimate guide to backyard bugs. Princeton, NJ: Princeton University Press.

Iowa State University. (2003-2016). Tomarus - Carrot . Retrieved April 03, 2016, from http://bugguide.net/node/view/8402

Larson, J. L., Giese, M. S., & Potter, D. A. (2016, September). First report of carrot beetle damage to golf course turf. Retrieved April 07, 2017, from https://www.gcsaa.org/gcm/2016/september/first- report-of-carrot-beetle-damage

Organic gardening info. com. (2016). Carrot Beetle. Retrieved April 03, 2016, from http://www.organicgardeninfo.com/carrot-beetle.html

University of California IPM. (2014). How to Manage Pests. Retrieved April 03, 2016, from http://www.ipm.ucdavis.edu/PMG/GARDEN/FLOWERS/INVERT/carrotbeet.html