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Sycamore Seed Bug (Belonochilus numenius)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Sycamore Seed Bug.

 Updated: 8/23/2019; Authored By Staff Writer; Content ¬©www.InsectIdentification.org




Newly introduced to Europe, the Sycamore Seed Bug feeds on the seeds of sycamore trees and has the potential to become a pest in urban areas.



Native to North America, the Sycamore Seed Bug lives and eats on sycamore trees, which are also called plane trees. True to the bug's name, it feeds on the tree's seeds, which limits the spreading of fertile seeds to other areas. How they arrived in Europe is unknown, but they have been noticed in substantial numbers in parks and walkways lined with plane trees. They may become a nuisance over time, creating a need to spray trees. Sycamore Seed Bugs are able to survive cold winters as eggs; in warmer parts of their range, adults can take shelter under the bark of their host tree.

Sycamore Seed Bugs are long and a mottled dark brown. A triangular plate on the back sits near the head. Transparent wing tips are exposed and overlap each other by the end of the abdomen. Adults are active from mid-spring through autumn and 3 to 4 generations can be produced in a single year.




Taxonomic Hierarchy
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Hemiptera
        Family: Lydaeidae
          Genus: Belonochilus
            Species: numenius
Identifying Information
Scientific Name: Belonochilus numenius
Category: True Bug
Size (Adult; Length): 8mm to 10mm (0.31in to 0.39in)
Colorwheel Graphic Colors: brown, tan
Territorial Map
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Territorial Reach (A-to-Z)
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
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Alberta
British Columbia
Manitoba
New Brunswick
Newfoundland and Labrador
Nova Scotia
Ontario
Prince Edward Island
Quebec
Saskatchewan
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Mexico
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed above as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.