Oberea schaumii

LeConte, 1852

Oberea schaumii is a cerambycid beetle that develops as larvae in trembling aspen (Populus tremuloides). The has a variable duration: most individuals require three years to develop, though some complete development in two years and others require four. emerge from late June through July. The occurs in the crowns of large aspen trees and shows competitive interactions with Saperda inornata.

Oberea schaumii by (c) Hopper Museum, some rights reserved (CC BY), uploaded by Hopper Museum. Used under a CC-BY license.Oberea schaumii by (c) Hopper Museum, some rights reserved (CC BY), uploaded by Hopper Museum. Used under a CC-BY license.Obereaschaumii by Quinn Desilets. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Oberea schaumii: /oʊˈbɛə.rə ˈʃaʊ.mi.aɪ/

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Habitat

Living trembling aspen (Populus tremuloides) trees, particularly stems 2–5 cm in diameter; occurs in root suckers and twigs of larger trees within aspen crowns. The appears to prefer stressed or suppressed trees rather than healthy vigorous individuals.

Distribution

Canada: Alberta, British Columbia, Manitoba, New Brunswick; Upper Michigan and northern Wisconsin, USA.

Seasonality

emerge from late June through July.

Diet

Larvae feed on cambium and sapwood of Populus tremuloides (trembling aspen).

Host Associations

  • Populus tremuloides - larval Trembling aspen; primary for larval development in stems 2–5 cm diameter

Life Cycle

Variable development time: 77.5% of individuals require three years, 5.0% require two years, and 17.5% require four years to complete development. pattern with emerging late June through July. laid on trees; larvae tunnel in cambium and sapwood; occurs in wood; overwinters as larva.

Behavior

Larvae tunnel in cambium and sapwood of living trees. Shows inter- and intra-specific competition with Saperda inornata within aspen crowns.

Ecological Role

Primary cambium and sapwood borer in trembling aspen; may contribute to stress and mortality in suppressed or weakened trees.

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Sources and further reading