Trirhabda borealis

Blake, 1931

Boreal Goldenrod Leaf Beetle

Trirhabda borealis is a skeletonizing leaf beetle in the Chrysomelidae. It is a herbivore associated with goldenrod (Solidago) and has been studied for its movement in fragmented versus continuous . The occurs in North America, with records from western Canada and the northern United States.

Trirhabda borealis by (c) Judy Gallagher, some rights reserved (CC BY). Used under a CC-BY license.

Trirhabda borealis by the Smithsonian. Used under a CC0 license.

Pronunciation

How to pronounce Trirhabda borealis: /tɹɪˈræbdə bɔːˈɹiːəlɪs/

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Identification

of Trirhabda borealis can be distinguished from other Trirhabda by their association with and montane goldenrod . The Trirhabda is characterized by skeletonizing feeding damage on leaves, leaving the intact. Specific morphological diagnostic features for T. borealis require examination of genitalic structures and elytral punctation patterns.

Images

Habitat

Associated with goldenrod (Solidago) , including both continuous patches and fragmented landscapes. Occurs in montane and environments.

Distribution

North America. Documented from Alberta, British Columbia, and Manitoba in Canada.

Diet

Specialized herbivore feeding on goldenrod (Solidago). Skeletonizes leaves by consuming tissue between the .

Host Associations

Solidago - primary plantgoldenrod

Behavior

Movement is strongly influenced by landscape structure. In continuous goldenrod patches, beetles move infrequently in brief bursts of slow meandering movements. In fragmented with cut vegetation, beetles move frequently in sustained bursts of slow directed movements. In habitats with structural complexity (netting), beetles move frequently in brief bursts of fast meandering movements. Beetles do not appear to detect goldenrod from a distance or respond to edge types.

Ecological Role

As a herbivore on goldenrod, T. borealis contributes to top-down control of goldenrod . Its movement in fragmented landscapes has implications for understanding how structure affects herbivore and .

Similar Taxa

Trirhabda canadensisAlso feeds on goldenrod; distinguished by distribution and plant associations
Trirhabda virgataOverlaps in use; requires morphological examination for definitive identification