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Satin Moth (Leucoma salicis)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Satin Moth.

 Updated: 6/25/2018; Authored By Staff Writer; Content ¬©www.InsectIdentification.org




The white Satin Moth looks like an angel, but in large numbers, it spells impending trouble for poplars and willows.



Satin Moths are completely white with the exception of their legs. Their legs are checkered in black and white. It seems inconceivable that such a lovely, satiny moth would cause problems, but this species gives rise to many hungry caterpillars. Satin Moth caterpillars are voracious eaters of poplar and willow leaves, and after an initial round of feeding in the spring, more come back in late summer. They eat tree leaves, leaving only the main vein and petiole behind. This damage is visible as more sunlight gets through and the tree canopy begins to look like it is disappearing. Heavy feeding in the early summer by a large number of caterpillars can completely defoliate a tree. Without leaves, a tree must resort to its food stores to survive until a new batch of leaves can grow. Unfortunately, by the time new leaves grow, another batch of larvae hatch and eat away at them, though not as vigorously as the early generation. After a few years of this level of stress, trees die.

Satin Moth adults emerge in summer. Males and females mate in mid-summer, and females lay light green eggs in oval-shaped groupings on leaves and branches among the poplar trees. About a month later, these eggs hatch and larvae begin to feed on leaves until they prepare for winter. They move to the tree trunk and wrap silk around themselves to protect them from the cold winter months. They emerge from these cocoons in spring to continue eating and developing. It is this group of caterpillars that does the heavy damage to tree foliage. Once they have matured enough, they pupate, becoming a new generation of adults that produce offspring in late summer. There is no way to keep Satin Moths from accessing poplar trees. Maintaining superior tree health and introducing natural predators to the area may help reduce tree defoliation and stress. Certain insecticides that are sprayed in the spring, when the caterpillars are coming out of hibernation, can also aid in limiting damage.

Satin Moths can form large populations and adults are attracted to lights. They may cluster in an area so closely that they look like a blanket of snow. Caterpillars are 35-40 mm (1.5 inches) long and have black bodies with large pale yellow/white dots on their dorsal (spine) side. Each pale spot is flanked on both sides with a round, red bump. Red bumps also run down toward the ventral side by the feet. Yellow tufts of spiky hairs protrude from them. They may be seen crawling around the ground as they move to other trees. They may also roll leaves and secure them with silk to form a retreat in which to pupate.




Taxonomic Hierarchy
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Lepidoptera
        Family: Erebidae
          Genus: Leucoma
            Species: salicis
Identifying Information
Scientific Name: Leucoma salicis
Category: Butterfly or Moth
Size (Adult; Length): 24mm to 50mm (0.94in to 1.95in)
Colorwheel Graphic Colors: white, black
Descriptors: satin, sheen, shiny, glossy, flying, destructive, pest, checkered legs
Territorial Map
Alaska  
Hawaii  
Prince Edward Is.  
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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.




Butterfly and Moth Anatomy
Graphic showing basic anatomy of a common North American butterfly and moth insect
1
Antennae: Butterflies and Moths have a pair of antennae on the head used as sensors.
2
Head: The head is home to the insect's eyes, antennae, and proboscis.
3
Thorax: Home to the three pairs of legs as well as vital internal organs.
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Abdomen: Contains vital internal organs such as the heart(s) and reproduction facilities.
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Forewing: The upper, forward wing pair used for flying.
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Hindwing: The lower, rearward wing pair used for flying.
NOTE: Butterflies and Moths are part of the Lepidopteran order as they share many similarities.