Aphthona

Chevrolat in Dejean, 1836

Spurge Flea Beetles

Aphthona is a of in the , to Europe and Asia with approximately 135 in the Palaearctic region and some 300 species worldwide. Members possess enlarged hind legs adapted for jumping, a characteristic trait of the tribe Alticini. The genus has gained significant attention for applications, with several species to North America to manage leafy spurge (Euphorbia esula), a major weed. Six species—A. abdominalis, A. cyparissiae, A. czwalinae, A. flava, A. nigriscutis, and A. lacertosa—have been used for this purpose, though establishment success varies. Some African species have been identified as pests of Jatropha curcas in biodiesel plantations.

Aphthona by (c) portioid, some rights reserved (CC BY), uploaded by portioid. Used under a CC-BY license.

Aphthona by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Aphthona crucifera by the Smithsonian. Used under a CC0 license.

Pronunciation

How to pronounce Aphthona: //ævˈθoʊ.nə//

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Identification

in this can be recognized by their enlarged hind adapted for jumping, a diagnostic feature of the tribe Alticini. -level identification requires examination of male and female ; micrographs and scanning electron micrographs of genital structures and other morphological characters are used for accurate determination. Discriminant analysis using six morphological characters has been employed to distinguish among closely related species.

Images

Habitat

to Europe and Asia; occupies diverse terrestrial . In North America, established occur in rangelands and areas infested with leafy spurge. Some African occur in biodiesel plantations.

Distribution

range: Europe and Asia (Palaearctic region). to localized areas of the United States and Canada for . Sub-Saharan African documented in Namibia and surrounding regions. Distribution records from Denmark, Norway, and Sweden.

Host Associations

Euphorbia esula L. (leafy spurge) - primary for major weed in western North America; six Aphthona for control
Jatropha curcas L. - for Aphthona cookei -group in Sub-Saharan Africa identified as pests of this biodiesel
Euphorbia brachycera Engelm. - potential non-target North spurge consubgeneric with leafy spurge; field studies show low risk of shift

Behavior

jump using enlarged hind legs to escape potential danger. Evidence suggests chemical cues influence and distribution in A. nigriscutis. Released have failed to persist when directly into non-target .

Ecological Role

agent for leafy spurge in North America; effectiveness varies by site due to soilborne , spring , soil texture, and weed . Control is less effective in sandy soils and may require 10 years or more for reliable observation. Some African function as agricultural pests in biodiesel plantations.

Human Relevance

Significant value as agents against leafy spurge, reducing cover and of this weed in rangelands. Six have been to North America from Europe; A. abdominalis apparently failed to establish viable in the United States and was never introduced in Canada. Risk of non-target effects on Euphorbia species appears low based on testing and field surveys.