Asiatic Oak Weevil Cyrtepistomus castaneus (Roelofs, 1873)Non-native    Synonyms: Asian Oak Weevil.
Kingdom Animalia   >   Phylum Arthropoda   >   Class Insecta   >   Order Coleoptera   >   Family Curculionidae   >   Genus Cyrtepistomus   

Status:

The Asiatic Oak Weevil "was introduced into the United States in 1933 (New Jersey) and now occurs throughout much of the East. Small, legless grubs associated with the roots of hardwood trees survive the fall, winter, and early spring. The grubs pupate and new adults emerge during the spring to feed on the leaves of oaks and chestnut. Asiatic oak weevils emerge in May and become most abundant in late June and early July. They feed on the margins of leaves, sometimes devouring everything but the main veins. This weevil takes shelter in leaves tied together by caterpillars. The weevils start laying eggs in soil in July and continue on into early fall" (NC State Extension, 2019).

Description:

This weevil is small (1/4 to 1/3 inch long) and broad-nosed. It is usually greenish-gray, but if its scales are worn away, it may appear reddish-brown.

Relationships:

Oak and chestnut leaves are the favored food of the Asiatic Oak Weevil. A bad infestation can lead to excessive leaf damage. American Chestnut (Castanea dentata) and closely related hybrids seem to be more susceptible than is Chinese Chestnut (Case, et al., 2016).

There are 178 records in the project database.

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An Asiatic Oak Weevil in Montgomery Co., Maryland (8/16/2019). Verified by V. Belov/BugGuide. Photo by Steve Scholnick. (MBP list)

An Asiatic Oak Weevil in Montgomery Co., Maryland (7/3/2016). Photo by Steve Scholnick. (MBP list)

An Asiatic Oak Weevil in Prince George's Co., Maryland (9/6/2016). Determined by Blaine Mathison/BugGuide. Photo by Barbara Thurlow. (MBP list)

An Asiatic Oak Weevil in Frederick Co., Maryland (7/30/2016). Determined by Blaine Mathison/BugGuide. Photo by Mark Etheridge. (MBP list)

Asiatic Oak Weevil in Anne Arundel Co., Maryland (7/5/2020). (c) Sergei Drovetski, all rights reserved. Photo by Sergei Drovetski. (MBP list)

An Asiatic Oak Weevil in Frederick Co., Maryland (8/23/2015). Determined by Blaine Mathison/BugGuide. Photo by Mark Etheridge. (MBP list)

Asiatic Oak Weevil in Baltimore Co., Maryland (8/26/2018). (c) Judy Gallagher, some rights reserved (CC BY-NC). Photo by Judy Gallagher. (MBP list)

An Asiatic Oak Weevil in Harford Co., Maryland (6/23/2019). Verified by Blaine Mathison/BugGuide. Photo by Dave Webb. (MBP list)

Asiatic Oak Weevil in Frederick Co., Maryland (9/12/2014). Verified by Blaine Mathison/BugGuide. Photo by Mark Etheridge. (MBP list)

Asiatic Oak Weevil in Baltimore Co., Maryland (7/25/2021). (c) Emily L. Stanley, some rights reserved (CC BY-NC). Photo by Emily Stanley. (MBP list)

Asiatic Oak Weevil in Prince George's Co., Maryland (8/12/2020). No rights reserved. Photo by Sam Droege. (MBP list)

Asiatic Oak Weevil in Anne Arundel Co., Maryland (10/5/2017). (c) Timothy Reichard, all rights reserved. Photo by Timothy Reichard. (MBP list)

Asiatic Oak Weevil in Prince George's Co., Maryland (8/12/2020). No rights reserved. Photo by Sam Droege. (MBP list)

Asiatic Oak Weevil in Prince George's Co., Maryland (8/12/2020). No rights reserved. Photo by Sam Droege. (MBP list)

An Asiatic Oak Weevil in Frederick Co., Maryland (8/12/2016). Photo by Mark Etheridge. (MBP list)

Asiatic Oak Weevil in Anne Arundel Co., Maryland (5/10/2021). (c) Sergei Drovetski, all rights reserved. Photo by Sergei Drovetski. (MBP list)

Asiatic Oak Weevil in Montgomery Co., Maryland (7/29/2021). (c) Zachary Dankowicz, some rights reserved (CC BY-NC). Photo by Zachary Dankowicz via iNaturalist. (MBP list)

An Asiatic Oak Weevil in Harford Co., Maryland (7/4/2021). Photo by Dave Webb. (MBP list)

Asiatic Oak Weevil in Anne Arundel Co., Maryland (9/6/2020). (c) Sergei Drovetski, all rights reserved. Photo by Sergei Drovetski. (MBP list)

Asiatic Oak Weevil in Frederick Co., Maryland (7/4/2017). (c) Mark Etheridge, some rights reserved (CC BY-NC). Photo by Mark Etheridge. (MBP list)

Asiatic Oak Weevil in Anne Arundel Co., Maryland (9/22/2020). (c) Sergei Drovetski, all rights reserved. Photo by Sergei Drovetski. (MBP list)

An Asiatic Oak Weevil in Worcester Co., Maryland (7/15/2013). Determined by Blaine Mathison/BugGuide. Photo by Scott Housten. (MBP list)

An Asiatic Oak Weevil in Washington Co., Maryland (6/27/2018). Photo by Mark Etheridge. (MBP list)

An Asiatic Oak Weevil in Cecil Co., Maryland (7/3/2015). Verified by Blaine Mathison/BugGuide. Photo by Shannon Schade. (MBP list)

An Asiatic Oak Weevil in Frederick Co., Maryland (6/8/2013). Photo by Jim Stasz. (MBP list)

Asiatic Oak Weevil in Anne Arundel Co., Maryland (8/23/2018). (c) Timothy Reichard, all rights reserved. Photo by Timothy Reichard. (MBP list)

An Asiatic Oak Weevil in Frederick Co., Maryland (7/8/2017). Photo by Mark Etheridge. (MBP list)

An Asiatic Oak Weevil in Baltimore Co., Maryland (7/6/2018). Determined by Blaine Mathison/BugGuide. Photo by Emily Stanley. (MBP list)

An Asiatic Oak Weevil in Harford Co., Maryland (7/10/2017). Photo by Josh Emm. (MBP list)

Asiatic Oak Weevil in Prince George's Co., Maryland (7/9/2020). (c) Hans Holbrook, some rights reserved (CC BY-NC). Photo by Hans Holbrook. (MBP list)

Asiatic Oak Weevil in Anne Arundel Co., Maryland (7/20/2018). (c) Timothy Reichard, all rights reserved. Photo by Timothy Reichard. (MBP list)

Asiatic Oak Weevil in Caroline Co., Maryland (8/14/2021). (c) Jim Brighton, some rights reserved (CC BY-NC). Photo by Jim Brighton. (MBP list)

Asiatic Oak Weevils in Harford Co., Maryland (10/2/2017). Photo by Shannon Schade. (MBP list)

An Asiatic Oak Weevil in Anne Arundel Co., Maryland (6/23/2018). Determined by Blaine Mathison/BugGuide. Photo by Bill Hubick. (MBP list)

An Asiatic Oak Weevil in Anne Arundel Co., Maryland (6/23/2018). Determined by Blaine Mathison/BugGuide. Photo by Bill Hubick. (MBP list)

Asiatic Oak Weevil in Anne Arundel Co., Maryland (10/5/2017). (c) smuller, some rights reserved (CC BY-NC). Photo by Sue Muller. (MBP list)


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