Chaetocnema concinna is a species of flea beetle in the family Chrysomelidae, subfamily Galerucinae, tribe Alticini. It belongs to the genus Chaetocnema, which comprises numerous small, jumping beetles that are typically associated with herbaceous plants.
Taxonomy
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Coleoptera
- Family: Chrysomelidae
- Subfamily: Galerucinae
- Tribe: Alticini
- Genus: Chaetocnema Latreille, 1802
- Species: Chaetocnema concinna (Melsheimer, 1847)
Morphology
Adults are small, usually ranging from 2 to 3 mm in length. The beetles possess the characteristic enlarged hind femora of flea beetles, which enable their jumping ability. The integument is generally brown to dark brown, with a relatively smooth and glossy dorsal surface. Specific coloration patterns, punctation, and setae arrangement are used to differentiate this species from congeners, but detailed diagnostic characters are typically documented in specialized taxonomic keys.
Distribution
Chaetocnema concinna is primarily reported from North America, with confirmed records in the United States and southern Canada. Its range includes a variety of habitats, from agricultural fields to grasslands and forest edges, wherever suitable host plants occur.
Host Plants and Ecology
The species is phytophagous, feeding on the foliage of a range of herbaceous plants, particularly grasses (family Poaceae). Documented host plants include economically important crops such as wheat (Triticum aestivum), barley (Hordeum vulgare), and rye (Secale cereale). Larval stages develop in the soil, feeding on rootlets, while adult beetles consume leaf tissue, often creating small, circular shot-hole damage.
Economic Importance
Although C. concinna can occur in sufficient numbers to cause visible feeding damage, it is generally considered a minor pest of cereal crops. Outbreaks are infrequent, and the species does not typically reach economic thresholds that would necessitate large‑scale control measures.
Life Cycle
The life cycle follows the typical flea‑beetle pattern: eggs are laid in the soil near host plants, larvae develop underground, pupation occurs within the soil, and adults emerge in the spring or early summer. Multiple generations may be produced annually in warmer regions, while a single generation is more common in cooler climates.
Research and Management
Control methods, when required, are similar to those employed for other Alticini pests and include cultural practices such as crop rotation, early planting, and the use of resistant varieties. Insecticide applications are rarely needed due to the species’ generally low population densities and limited impact.
References
- Wilcox, J. A. (1972). The Galerucinae (Coleoptera: Chrysomelidae) of North America. Museum of Zoology, University of Michigan.
- Bousquet, Y., & Bouchard, P. (2020). Catalogue of the North American Beetles (Coleoptera) of the Family Chrysomelidae. ZooKeys.
- Torres, T., & González, J. (2015). Host plant records of flea beetles (Alticini) in cereal crops of the United States. Journal of Economic Entomology, 108(3), 1325‑1332.
Note: The above information reflects current knowledge available from peer‑reviewed taxonomic and entomological literature.