Oberea tripunctata

(Swederus, 1787)

dogwood twig borer

Oberea tripunctata, commonly known as the dogwood , is a of longhorn in the . emerge in early June and feed on dogwood twigs, causing girdling damage. Females lay singly on healthy twigs; bore into twigs and overwinter in stems, with some individuals taking up to two years to complete development. The species is considered a minor pest of flowering dogwood and has been recorded from additional including elm, azalea, viburnum, and various fruit trees.

Pronunciation

How to pronounce Oberea tripunctata: /oʊˈbɪə.rə traɪˌpʌŋkˈtɑːtə/

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Identification

are slender and elongated, measuring 10–15 mm in length and approximately 3 mm in width. The is dark to black. The bears three prominent black spots arranged in a triangular pattern. The are yellowish tan with a narrow black on the inner edge and a broader dark line on the outer margin; two distinct dots are present immediately behind the head. Final- are yellowish, legless, and approximately 19 mm long.

Habitat

Associated with flowering dogwood trees (Cornus florida); also found on elm, azalea, viburnum, and various fruit trees. Occurs in wooded areas, suburban landscapes, and wherever plants are present.

Distribution

Widespread in the United States; present in Canada in Alberta, Manitoba, New Brunswick, and Ontario.

Seasonality

emerge in early June. overwinter in stems and pupate in spring, with typically occurring between mid-May and early June.

Diet

feed on dogwood twigs. bore into twigs and feed internally on woody tissue. Primary is flowering dogwood (Cornus florida); additional hosts include elm (Ulmus), azalea (Rhododendron), viburnum, and various fruit trees.

Host Associations

Cornus florida - primary flowering dogwood; primary for feeding and
Ulmus - elm
Rhododendron - azalea
Viburnum - viburnum
various fruit trees - unspecified fruit tree

Life Cycle

Females lay singly on healthy twigs. Upon hatching, enter twigs and bore downward into the center, creating closely packed holes to expel . Larvae overwinter within stems. Some larvae require two years to complete development. occurs in spring, with emerging between mid-May and early June.

Behavior

cause girdling damage around twig tips while feeding. bore internally through twig tissue, sometimes internally separating portions of twigs.

Human Relevance

Considered a minor pest of dogwood. is indicated by wilting leaves on twigs, drooping, and girdling of twig tips. Control methods include pruning infested twigs several inches below the and destroying them before in spring, or applying before . Less damaging than the dogwood borer (Synanthedon scitula).

Similar Taxa

Oberea oculaticollisSimilar slender body form and grayish ; distinguished by dark and dense gray pubescence in O. oculaticollis versus yellowish tan with black markings in O. tripunctata
Synanthedon scitulaBoth attack dogwood; S. scitula (dogwood borer) is a () and causes more severe damage; differ markedly in appearance