×
BugFinder Insects by State Spiders Butterflies & Moths Bees, Ants, & Wasps Beetles All Bugs Videos (YouTube)

Fall Webworm (Hyphantria cunea)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Fall Webworm



Loading SVG image placeholder
1/10
Image Credit: Alex -icycatelf- Bowen
Full-sized image of the Fall-Webworm-Moth Thumbnail image of the Fall-Webworm-Moth
2/10
Image Credit: Alex -icycatelf- Bowen
Full-sized image #2 of the Fall-Webworm-Moth Thumbnail image #2 of the Fall-Webworm-Moth
3/10
Image Credit: Alex -icycatelf- Bowen
Full-sized image #3 of the Fall-Webworm-Moth Thumbnail image #3 of the Fall-Webworm-Moth
4/10
Image Credit: Alex -icycatelf- Bowen
Full-sized image #4 of the Fall-Webworm-Moth Thumbnail image #4 of the Fall-Webworm-Moth
5/10
Image Credit: Alex -icycatelf- Bowen
Full-sized image #5 of the Fall-Webworm-Moth Thumbnail image #5 of the Fall-Webworm-Moth
6/10
Image Credit: Alex -icycatelf- Bowen
Full-sized image #6 of the Fall-Webworm-Moth Thumbnail image #6 of the Fall-Webworm-Moth
7/10
Image Credit: Alex -icycatelf- Bowen
Full-sized image #7 of the Fall-Webworm-Moth Thumbnail image #7 of the Fall-Webworm-Moth
8/10
Image Credit: Alex -icycatelf- Bowen
Full-sized image #8 of the Fall-Webworm-Moth Thumbnail image #8 of the Fall-Webworm-Moth
9/10
Image Credit: Kathleen P. from Schuyler Lake, NY
Full-sized image #9 of the Fall-Webworm-Moth Thumbnail image #9 of the Fall-Webworm-Moth
10/10
Image Credit: Nigel D., taken in IL
Full-sized image #10 of the Fall-Webworm-Moth Thumbnail image #10 of the Fall-Webworm-Moth

The native Fall Webworm produces an active caterpillar that has expanded its geographical range across both oceans into two continents.



Updated: 08/31/2021; Authored By Staff Writer; Content ©www.InsectIdentification.org
The Fall Webworm is a moth that comes in two colors: all white in the north, or white with dark patches in the south (some with so many patches they resemble a giraffe). The thorax is hairy. Legs are white, or orange with brown on them. Part of its name stems from its larval form: a caterpillar that spins a silky web with its newly hatched siblings. These webs can cover twigs, branches or even entire trees. The web is sticky and tough to break into, acting as a barrier, allowing the caterpillars to feed on the leaves of the host plant with a good degree of protection from predators. Both color forms are now present in Europe and Asia. The first sightings of them outside of their native North American range began in the 1940's.

Females lay a carpet of light green, spherical eggs on the bottoms of leaves. After the caterpillars hatch, they immediately begin eating and building a tent web to cover themselves. The caterpillars, like adults, come in two color forms. In its northern range, it has a black head and hairy yellow body with black dots along the dorsal (back) side. In the southern range, the head is orange. One to four generations each year can be produced depending on the climate, but warmer climates breed even more generations. They feed on a large variety of tree leaves. Hickory, alder, elm, willow, mulberry, oak, poplar, sweetgum, birch, cherry, apple, and pecan trees are all hosts for Fall Webworms. They do not attack fruit and, though the webs are unsightly, they usually do not permanently damage a tree. They are active in the autumn and consume leaves right before the foliage dries up and falls off anyway. They are considered a pest to ornamental trees only because the purpose of an ornamental is to look attractive, and large, silk webs deter from those aesthetics. Management of Fall Webworms is not considered necessary. Certain species of wasps and flies are predators of this caterpillar, so a biological control exists.




General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
Flying insect icon
Hairy insect icon
Patterned insect icon


Advertisements




Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Lepidoptera
        Family: Erebidae
View More
          Genus: Hyphantria
View More
            Species: cunea
Identifying Information
Size, Colors, Features
Scientific Name: Hyphantria cunea
Category: Butterfly or Moth
Size (Adult; Length): 25mm to 42mm (0.98" to 1.65")
Colorwheel Graphic Colors: white, brown, black, red, yellow
Descriptors: furry, spots, giraffe, flying, hairy, caterpillar, cluster
Advertisements


Relative Size Comparison
Typical Size Between 25mm (1.0in) and 42mm (1.7in)
Lo: 25mm
Md: 33.5mm
Hi: 42mm
Territorial Map*
U.S., Canada, and Mexico
State of Alabama graphic
State of Arizona graphic
State of Arkansas graphic
State of California graphic
State of Colorado graphic
State of Delware graphic
State of Florida graphic
State of Georgia graphic
State of Idaho graphic
State of Illinois graphic
State of Indiana graphic
State of Iowa graphic
State of Kansas graphic
State of Kentucky graphic
State of Louisiana graphic
State of Maine graphic
State of Maryland graphic
State of Michigan graphic
State of Minnesota graphic
State of Mississippi graphic
State of Missouri graphic
State of Montana graphic
State of Nebraska graphic
State of Nevada graphic
State of New England graphic
State of New Jersey graphic
State of New Mexico graphic
State of New York graphic
State of North Carolina graphic
State of North Dakota graphic
State of Ohio graphic
State of Oklahoma graphic
State of Oregon graphic
State of Pennsylvania graphic
State of South Carolina graphic
State of South Dakota graphic
State of Tennessee graphic
State of Texas graphic
State of Utah graphic
State of Virginia graphic
State of Washington graphic
State of West Virginia graphic
State of Wisconsin graphic
State of Wyoming graphic
Canadian territory of Alberta graphic
Canadian territory of British Columbia graphic
Canadian territory of Manitoba graphic
Canadian territory of New Brunswick graphic
Canadian territory of Newfoundland and Labrador graphic
Canadian territory of Ontario graphic
Canadian territory of Quebec graphic
Canadian territory of Saskatchewan graphic
Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic
Alaska  
Hawaii  
Prince Edward Is.  
* MAP NOTES: The territorial heat map above showcases (in red) the states and territories of North America where the Fall Webworm may be found (but is not limited to). This sort of data is useful when attempting to see concentrations of particular species across the continent as well as revealing possible migratory patterns over a species' given lifespan. Some insects are naturally confined by environment, weather, mating habits, food resources and the like while others see widespread expansion across most, or all, of North America. States/Territories shown above are a general indicator of areas inhabited by the Fall Webworm. Insects generally go where they please, typically driven by diet, environmental changes, and / or mating habits.

Advertisements





Site Disclaimer  |  Privacy Policy  |  Cookies  |  Sitemap


Beetle Identification Butterfly Identification Caterpillar Identification Spider ID

www.InsectIdentification.org • Content ©2006- InsectIdentification.org • All Rights Reserved. The InsectIdentification.org logo, its written content, and watermarked photographs/imagery are unique to this website (unless where indicated) and is protected by all applicable domestic and international intellectual property laws. This resource uses publically-released information. Material presented throughout this website is for entertainment value and should not to be construed as usable for scientific research or medical advice (regarding bites, etc...).Please consult licensed, degreed professionals for such information. By submitting images to us (InsectIdentification.org) you acknowledge that you have read and understood our Site Disclaimer as it pertains to "User-Submitted Content". When emailing please include your location and the general estimated size of the specimen in question if possible. Please direct all inquiries and comments to insectidentification AT gmail.com.

www.InsectIdentification.org • All Rights Reserved • Content ©2006-

Facebook Logo YouTube Logo