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Ten-Lined June Beetle (Polyphylla decemlineata)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Ten-Lined June Beetle.

 Updated: 1/26/2017; Authored By Staff Writer; Content ¬©www.InsectIdentification.org




The well-defined Ten-Lined June Beetle is a western native that sticks to its roots and even gets a little hissy when disturbed.



When counting the white lines on a Ten-Lined June Beetle, count the middle line twice because it forms two separate lines once the wings open. The short lines on the sides of the elytra (wing covering) also count as part of that ten. This Scarab Beetle is larger than others and can grow to almost 2 inches in length. Adults are harmless and do not cause any real trouble, but their larvae can kill a tree, or stunt its growth, by devouring the roots. Often, the damage to the tree is unseen until it dies or falls over. These grubs live underground for 2-3 years, feasting on roots, which gives the tree no time to recover from season to season. For this reason, they are considered agricultural pests. Ending an infestation is only possible by removing affected trees and those near them (even if they are healthy). The holes where the removed trees lived are treated with an insecticide to prevent the next generation of trees from getting attacked. Covering soil with a phosphate-based insecticide between trees when adults are first seen can also help reduce population numbers. Apple trees and other orchard fruit trees are familiar food sources.

When mature, female Ten-Lined June Beetles release a pheromone into the air that males find irresistible. Males are also attracted to lights and large groups of them can be trapped by luring them with blacklight traps. Fertilized eggs are laid on the soil and larvae burrow down to find food and protection for winter months. Adults are active from middle to late summer.




Taxonomic Hierarchy
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Coleoptera
        Family: Scarabaeidae
          Genus: Polyphylla
            Species: decemlineata
Identifying Information
Scientific Name: Polyphylla decemlineata
Other Name(s): Ten-Lined June Bug, Watermelon Beetle
Category: Beetle
Size (Adult; Length): 20mm to 35mm (0.78in to 1.37in)
Colorwheel Graphic Colors: brown, white, black, ivory
Descriptors: stripes, lines, antennae, face, hairy, flying
Territorial Map
Alaska  
Hawaii  
Prince Edward Is.  
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Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic


Territorial Reach (A-to-Z)
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delware
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
Canadian National Flag Graphic
Alberta
British Columbia
Manitoba
New Brunswick
Newfoundland and Labrador
Nova Scotia
Ontario
Prince Edward Island
Quebec
Saskatchewan
Mexican National Flag Graphic
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.




Beetle Anatomy
Graphic showing basic anatomy of a common North American Beetle insect
1
Antennae: Beetles have a pair of antennae on the head used as sensors.
2
Head: The head is home to the insect's eyes, antennae, and mandibles (jaws).
3
Thorax: Holds the three pairs of legs as well as vital internal organs.
4
Elytron: One of two wing cases on a Beetle that protects its wings (plural: elytra).
5
Wings: Appendages used for flying and kept under the elytra until needed.
6
Abdomen: Houses organs related to circulation, reproduction, and excretion.
7
Legs: Beetles have three pairs of legs located at the thorax, numbering six legs in all.