Conotrachelus retentus

Boheman in Schoenherr, 1845

Black Walnut Curculio

Conotrachelus retentus, commonly known as the black walnut curculio, is a true () to North America. The is tightly associated with black walnut (Juglans nigra), with developing inside developing nuts and feeding on foliage. Adults exhibit limited and have been observed to rarely leave their natal tree. The species is considered a pest of walnut production due to damage to nuts and foliage.

Pronunciation

How to pronounce Conotrachelus retentus: /ˌkoʊnoʊˈtɹækələs rɪˈtɛntəs/

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Habitat

Associated with containing black walnut (Juglans nigra). are found on walnut trees and in surrounding areas.

Distribution

North America. Specific range details beyond continental presence are not documented in available sources.

Diet

feed on developing walnut nuts. feed on black walnut foliage.

Host Associations

Juglans nigra - Black walnut; develop in nuts, feed on foliage

Life Cycle

Females oviposit into developing walnut nuts. develop internally within the nuts. Larvae exit nuts to pupate in soil. emerge from soil and to walnut trees. Seasonal activity patterns have been documented.

Behavior

are capable of sustained for of new trees; flight activity is influenced by environmental factors. Adults rarely leave the tree on which they were born, indicating strong site fidelity.

Ecological Role

Pest of black walnut; impacts walnut nut production and quality through larval feeding damage and foliage feeding.

Human Relevance

Economic pest of black walnut . Damage to developing nuts reduces yield and quality. feeding on foliage may also impact tree health.

Similar Taxa

Conotrachelus nenupharAlso in Conotrachelus, but distinguished by association—C. nenuphar feeds on rosaceous fruits (stone and pome fruits) rather than walnuts, and has a broader geographic range with documented strains varying in .

More Details

Dispersal Behavior

Research on and indicates that while are capable of sustained flight for colonizing new trees, they exhibit strong philopatry, rarely leaving their natal tree. This has implications for spread and management strategies.