Pseudocneorhinus bifasciatus

Roelofs, 1880

twobanded Japanese weevil, two-banded Japanese weevil

Pseudocneorhinus bifasciatus is an broad-nosed to Japan that has established in the United States. First detected near Philadelphia in 1914, it is believed to have arrived via infested nursery stock. The has since spread throughout the northeastern, midwestern, and southeastern United States, with documented presence in at least 11 states. It is recognized as a significant pest of ornamental and landscape plantings due to its broad range.

Pseudocneorhinus bifasciatus by (c) Katja Schulz, some rights reserved (CC BY). Used under a CC-BY license.

Pseudocneorhinus (10.3897-zookeys.853.33311) Figures 31–36 by Ren L, Borovec R, Zhang R (2019) On the genus Pseudocneorhinus (Coleoptera, Curculionidae, Entiminae), with descriptions of five new species from China. ZooKeys 853: 57-86. https://doi.org/10.3897/zookeys.853.33311. Used under a CC BY 4.0 license.

Two-banded Japanese Weevil - Pseudocneorhinus bifasciatus, Meadowood Farm SRMA, Mason Neck, Virginia by Judy Gallagher. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Pseudocneorhinus bifasciatus: /ˌsjuːdoʊkniːˈɔraɪnəs baɪˌfæsɪˈeɪtəs/

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

Identification

A broad-nosed with two distinct pale across the , giving rise to its . are small weevils with the characteristic of . and have been described in scientific literature, with larvae being soil-dwelling and C-shaped, typical of weevil immatures.

Images

Habitat

Associated with landscape plantings, nursery stock, and ornamental plantings. Larval stages occur in soil around roots.

Distribution

to Japan. to the United States: first collected 1914 near Philadelphia, Pennsylvania. Established in northeastern and midwestern United States. Documented in southeastern states: Alabama (3 counties), Georgia (12 counties), North Carolina (16 counties), South Carolina (19 counties), with first collections in 1955 (North Carolina), 1956 (Georgia), 1966 (South Carolina), and 1970 (Alabama). Also recorded in Florida (2005), Connecticut, and District of Columbia. Distribution continues to expand due to movement of nursery stock.

Diet

feed on foliage of plants. feed on roots.

Host Associations

over 100 plant species - broad range including numerous ornamental and landscape plants; specific host records documented in scientific literature but not enumerated in available sources

Life Cycle

with , larval, pupal, and stages. are soil-dwelling and feed on roots. occurs in soil. Larval and pupal stages have been formally described in taxonomic literature.

Ecological Role

Pest of ornamental plantings and landscape vegetation. Soil-dwelling contribute to below-ground on roots.

Human Relevance

Recognized as an important pest of landscape plantings in the northeastern and midwestern United States. Not yet a major pest in southeastern states, but range expansion is anticipated due to nursery stock movement. Management concerns include protection of ornamental and nursery plantings.

Similar Taxa

other Pseudocneorhinus speciescongeneric with similar broad-nosed ; requires examination of elytral banding patterns and for definitive identification
other Entiminae weevilsbroad-nosed share general body form; distinguished by specific elytral pattern of two pale

More Details

Reproduction

in the United States are parthenogenetic, with occurring without males. This reproductive mode facilitates establishment and spread by single females.

Invasion History

The exemplifies classic nursery stock-mediated invasion, with initial establishment near major port cities (Philadelphia) followed by gradual range expansion correlated with horticultural trade.