Longitarsus quadriguttatus

(Pontoppidan, 1765)

flea beetle

Longitarsus quadriguttatus is a flea beetle (Chrysomelidae) native to Central and south-eastern Europe, Asia Minor, and the Caucasus. It has been introduced to North America as a agent for hound's tongue (Cynoglossum officinale), an weed. feed on leaves while larvae develop as root-feeders inside plant roots. The shows strong host specificity for plants in the Boraginaceae, particularly the tribe Cynoglosseae.

Longitarsus quadriguttatus by Edmund Reitter, K.G. Lutz. Used under a Public domain license.

Pronunciation

How to pronounce Longitarsus quadriguttatus: //ˌlɔŋ.ɡɪˈtɑːr.səs ˌkwɒd.rɪˌɡʌˈteɪ.təs//

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Identification

Distinguished from other Longitarsus by subtle morphological characters not detailed in available sources. As a agent, its association with Cynoglossum officinale and other Boraginaceae species is diagnostically relevant. Distinguished from North American native flea beetles by its specific associations with Eurasian Boraginaceae.

Images

Habitat

Associated with plants in the Boraginaceae, particularly Cynoglossum officinale (hound's tongue) and Echium vulgare (viper's bugloss). In native range, found in Central and south-eastern Europe, Asia Minor, and Caucasus. In introduced range (North America), established in areas where hound's tongue occurs.

Distribution

Native: Central Europe, south-eastern Europe, Asia Minor, Caucasus. Introduced: North America (Canada: Alberta, British Columbia; United States), where established for of hound's tongue.

Seasonality

(one per year). activity synchronized with plant ; specific timing varies by region.

Diet

feed on leaves of Boraginaceae . Larvae feed internally on root tissues of plants.

Host Associations

Cynoglossum officinale - primary hound's tongue; target for in North America
Echium vulgare - viper's bugloss
Boraginaceae - and larvae feed on multiple in this ; strongest association with tribe Cynoglosseae

Life Cycle

. emerge, feed on leaves, and deposit on plant rosettes. Larvae develop inside host roots, completing development below ground. presumably occurs in soil or within root tissues, though specific details not described in sources.

Behavior

Below-ground herbivory by larvae; feed on foliage. Strong fidelity demonstrated in host specificity screening tests.

Ecological Role

Herbivore specialized on Boraginaceae. In North America, deployed as agent to suppress hound's tongue. Narrow range minimizes non-target effects.

Human Relevance

Introduced to North America as agent for hound's tongue (Cynoglossum officinale), a toxic weed of European origin that invades rangelands and displaces native vegetation. specificity studies confirmed safety for non-target plants.

Similar Taxa

Other Longitarsus speciesMorphologically similar flea beetles; distinguished by associations and subtle morphological characters
Native North American flea beetles (Chrysomelidae: Alticini)Similar jumping ability and general form; L. quadriguttatus distinguished by its specific association with Eurasian Boraginaceae

More Details

Biological control safety

specificity screening with 49 European plant showed exclusive attack on Boraginaceae. No feeding, oviposition, or larval development occurred on 18 test species in nine other . Occasional attack on non-Cynoglosseae Boraginaceae in laboratory could not be verified in field conditions.

Taxonomic varieties

Three varieties described by Weise in 1888: var. binotatus, var. immaculatus, and var. vittatus. Current taxonomic status of these varieties not assessed in available sources.