Diabrotica barberi

Smith & Lawrence, 1967

northern corn rootworm

, the , is a chrysomelid native to North America and a major pest of corn (Zea mays). Larvae feed on corn roots, causing significant economic damage, while feed on corn silks, pollen, and leaves. Unlike the western corn rootworm, D. barberi has not developed resistance to Bt traits in Iowa as of 2019-2020 surveys. The exhibits extended in some , with remaining for multiple years before hatching. Research indicates its differs from D. virgifera, with shorter but more frequent flights and less sustained long-distance movement.

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Pronunciation

How to pronounce Diabrotica barberi: /ˌdiːəˈbrɒtɪkə ˈbɑːrbəri/

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Identification

Distinguished from the western corn rootworm (Diabrotica virgifera) by : D. barberi takes shorter flights but at higher frequency over a 23-hour period, while D. virgifera shows bimodal flight distribution with distinct short trivial flights and longer sustained flights. D. virgifera logs substantially more total flight time. D. barberi also differs from D. longicornis in reproductive and hybridization patterns—crosses between D. barberi females and D. longicornis males produce non-viable offspring, while the reciprocal cross yields viable hybrids.

Images

Habitat

Associated with agricultural fields planted to corn (Zea mays) and other cereals (Poaceae). and oviposition are strongly influenced by plant , particularly the timing of corn flowering. Simulation models indicate that planting dates, seasonal temperature patterns, and year-to-year variation in affect the synchronization of beetle with flowering corn.

Distribution

North America: Canada (Manitoba, New Brunswick, Nova Scotia, Ontario, Quebec) and United States (Alabama, Arkansas, Colorado, Connecticut, Delaware, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Vermont, Virginia, West Virginia, Wisconsin).

Seasonality

timing varies and is sensitive to seasonal temperature patterns; activity peaks during early morning and early evening hours. Extended occurs in Nebraska , with remaining for more than one winter before hatching.

Diet

feed on corn (Zea mays) and, when corn is unavailable, goldenrod pollen. Larvae feed on corn root hairs, smaller roots, and primary roots.

Host Associations

Zea mays - primary larvae feed on roots; feed on silks, pollen, and leaves
Poaceae - other cereals used as
Solidago - alternative food sourcegoldenrod pollen consumed when corn unavailable

Life Cycle

are laid in soil; some exhibit extended with multi-year dormancy. Larvae develop underground feeding on corn roots. occurs in soil. emerge and reproduce; female reproductive development and oviposition are temperature- and age-dependent. Pre-reproductive, reproductive, and post-reproductive stages have been characterized in laboratory studies.

Behavior

activity shows periodicity with peaks in early morning and early evening. Trivial flight performance does not vary with age. patterns are influenced by corn flowering , sex, and female reproductive maturity. Net from corn fields occurs on a season-long basis, with timing and magnitude of dispersal varying by field conditions.

Ecological Role

Herbivore and agricultural pest; are tightly coupled with corn . Acts as a model organism for studying insect-plant synchrony and the evolutionary of herbivores.

Human Relevance

Major economic pest of corn in North America. Survey data from Iowa (2019-2020) indicate it was the insect pest of greatest concern to corn farmers statewide, surpassing western corn rootworm in perceived importance in northeast and north-central Iowa. Management relies on crop , Bt corn (to which it has not yet developed resistance), soil-applied , and . Extended complicates management by allowing to persist across rotation cycles.

Similar Taxa

Diabrotica virgiferaOverlapping range and shared plant (corn); distinguished by patterns, with D. virgifera showing bimodal flight distribution and greater sustained flight capacity
Diabrotica longicornisClosely related with which hybridization has been proposed; distinguished by reproductive and hybrid viability patterns

More Details

Extended Diapause

Some Nebraska exhibit extended , with remaining viable in soil for multiple years. This trait allows populations to persist through crop cycles and complicates management strategies.

Hybridization Potential

Laboratory studies demonstrate asymmetric hybrid viability: crosses between D. longicornis females and D. barberi males produce fit offspring similar to parental , while the reciprocal cross yields poor viability and low survival. This suggests potential for in areas of sympatry.

Model Organism Status

D. barberi has been extensively studied using simulation models to understand , oviposition patterns, and insect-plant synchrony, making it one of the better-characterized agricultural pest systems.