Synanthedon proxima

(Edwards, 1881)

dogwood borer

Synanthedon proxima, commonly known as the dogwood borer, is a in the . It is to North America and primarily associated with Cornus . The species is recognized as a significant pest of ornamental dogwoods, particularly in urban and suburban landscapes. exhibit -mimicking appearance typical of the family, with transparent and often or orange coloration. Larval stages bore into the stems and trunks of plants, causing structural damage.

Pronunciation

How to pronounce Synanthedon proxima: /sɪˈnænθɛdɒn ˈprɒksɪmə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

Distinguished from other by association with Cornus and specific morphological features. Similar include other Synanthedon species, particularly S. scitula (dogwood borer is sometimes used for both, but they are distinct species). S. proxima can be separated by genital examination and host preference. The dogwood borer proper (S. scitula) is often confused with this species; accurate identification requires examination of male or molecular methods. may be attracted to lures specific to the species.

Appearance

have clear, transparent with dark along the margins and . The body is slender and -like, typically with and black or orange and black banding. are often in males. Wingspan ranges approximately 20-30 mm. are cream-colored with a , typical of sesiid borers.

Habitat

Associated with woodland edges, urban parks, and suburban landscapes where plants occur. Larval is within the cambium and wood of living Cornus stems and trunks.

Distribution

Nearctic region. Recorded from Alberta, Manitoba, and Saskatchewan in Canada. Distribution extends through the northern United States, with primary occurrence in regions supporting Cornus .

Seasonality

are active during summer months, typically June through August, with peak varying by latitude. Larval activity occurs throughout the growing season within tissues.

Diet

feed internally on the cambium and inner bark of living Cornus (dogwood) . do not feed; they rely on larval reserves.

Host Associations

Cornus - larval primary , including ornamental and dogwood

Life Cycle

are laid on bark of plants. bore into stems, feeding within the cambium for one to two years depending on conditions. occurs within the gallery, with emerging through exit holes. Typically or .

Behavior

are and exhibit -mimicking . They are generally not attracted to light traps. Males respond to -specific . create galleries in stems, often at wound sites or branch crotches.

Ecological Role

As a , creates entry points for secondary and decay organisms. Contributes to natural turnover of dogwood in settings, though economic impact is more pronounced in ornamental plantings.

Human Relevance

Recognized as a pest of ornamental dogwoods in nurseries and landscapes. cause dieback, reduced vigor, and tree decline. Management includes cultural practices to avoid wounding, , and targeted .

Similar Taxa

Synanthedon scitulaAlso called dogwood borer; historically confused with S. proxima. Separated by genital and subtle differences in use and distribution.
Synanthedon acerniAnother clearwing borer with similar appearance; associated with maple rather than dogwood.

Misconceptions

The 'dogwood borer' has been applied to both S. proxima and S. scitula, causing confusion. These are distinct with different distributions and ranges.

More Details

Pest Status

Considered a that exploits stressed or wounded trees. Primary damage occurs in ornamental settings rather than natural forests.

Monitoring

traps are used for and timing of management interventions.