<>
 

Species name

Diabrotica barberi Smith & Lawrence 1967: 87

 

Common name

Northern corn rootworm

 

Type locality

U.S.A., Illinois, Scott County, Bluffs

 

Type depository

MCZ, holotype, male, verified

 

Diagnosis

Body length 4.8-5.6 mm. Body width 2.0-2.5 mm. Head basic color yellow. Antennae filiform, bi- or tricolored, antennomere 1 yellow, testaceous or greenish brown, antennomeres 2-11 brussels brown. Maxillary palpi and labrum black or piceous. Pronotum paris green, green or yellow, quadrate, deeply bifoveate, not shagreened. Scutellum yellow or amber yellow. Elytra green, sometimes humeri and basal third of suture tinged with amber, with five distinct sinuate sulci, strongest behind the humeral callus and extending beyond the middle. Elytral epipleura green, sutural angle of elytra round, punctation scattered, fine. Abdomen yellow, pale olivine or green. Tarsi black, amber brown or chestnut. Tibiae bicolored yellow, outer edge with piceous or testaceous line, or extensively darkened. Femora uniform yellow or olive ocher. Aedeagus symmetric, with four internal sac sclerites.

 

Known distribution

CANADA: Manitoba, New Brunswick, Ontario, Quebec; USA: AL, AR, CO, CT, DE, GA, IL, IN, IA, KS, KY, MD, MA, MI, MN, MO, NE, NH, NJ, NY, NC, ND, OH, OK, PA, RI, SC, SD, TN, VT, VA, WV, WI. (Distribution Maps of Plant Pests, http://www.cabi.org/dmpp)

 

Host plants

Maize (Zea mays L.), Cucurbitaceae, Poaceae, Asteraceae and Fabaceae (Clark et al., 2004)

 

Potential problems with identification

Diabrotica barberi Smith & Lawrence is similar to D. longicornis (Say) and D. virgifera LeConte. They can be separated by the following features: in D. barberi the head, tibia and tarsi are paler than in D. longicornis; femora unicolorous green or flavous in D. barberi, while femora of D. virgifera as a rule bicolored, with outer edges dark, chestnut or piceous; distance from apex to ventral flange of aedeagus in D. v. virgifera is 1.5 - 2.0 times that of D. barberi. The shapes of the internal sac sclerites (especially sclerite 4B) differentiates all three species very well.