Male and female gypsy moths are different colors from each other. Males are light brown with dark brown wings that have black bands on them. Females are mostly white, and also have dark bands on their wings. Males have feathery antennae, and females have antennae that look and feel like threads. Females are are a little bit bigger than males, and their bodies are covered with tiny hairs. Adult gypsy moths are normally 15 to 35 mm long, and their wingspan is 37 to 62 mm. There are three subspecies, which are European, Asian, and Japanese gypsy moths. They all look similar, but Asian gypsy moths usually have the biggest largest larvae. ("Gypsy Moth", 2009; "Lymantria dispar (insect)", 2011)
Gypsy moth larvae are black, hairy caterpillars. As they get older, they grow two rows of blue spots on their backs that then turn red. Each spot has a patch of yellow or brown hair growing out of it. Their legs are dark red. ("Gypsy Moth", 2009; "Lymantria dispar (insect)", 2011)
Gypsy moths originally lived in southern Europe, northern Africa, central and southern Asia, and Japan. They were introduced into the United States and Canada in 1869, and have spread quickly across North America. There are a lot of them in the northeastern United States. ("Lymantria dispar (insect)", 2011; Munson and Hanson, 1981)
Gypsy moths live in forests or open forests, where the trees and shrubs they live on take up at least 20% of the space. They live in temperate climates, meaning places that have seasons. They are found near humans in urban and suburban areas. ("Lymantria dispar (insect)", 2011; McManus, et al., 1989)
Gypsy moths go through 4 stages of development, which are called: egg, larva, pupa, and adult. Females lay eggs in July or August on the trunks or branches of trees. After 4 to 6 weeks, the embryos develop into larvae. The larvae stay dormant in their eggs throughout the winter. They hatch in the next spring, together when the trees they live on get buds on them. As gypsy moths get older, larvae shed their skin and grow a new, larger one. This usually happens 5 or 6 times, and then they become pupae in June or July. They stay as pupae for 7 to 14 days. Males come out first, usually 1 to 2 days before females. Then, females come out and gypsy moths breed. Both parents die after the eggs are laid, and the cycle repeats. ("Gypsy Moth", 2009; McManus, et al., 1989)
Female gypsy moths release chemicals called pheromones to attract males. Females lay eggs 24 hours after mating. Males mate with more than one female. ("Gypsy Moth", 2009)
Adult gypsy moths breed one time per year, usually in July or August. Females usually lay about 1,000 eggs per breeding season on tree trunks and branches. It only takes about 1 month for larvae to develop inside the eggs, but they usually take 8 to 9 months to hatch. Larvae are attracted to light after they hatch. They move up their host trees by spinning silk threads. They live in the tops of the trees until they become pupae, and develop in a silk net on or near their host tree. After they become pupae, it takes about 2 weeks for them to become adults. Gypsy moths live for about 11 months before they can reproduce. ("Gypsy Moth", 2009; "Lymantria dispar (insect)", 2011)
Adult gypsy moths live until the females lay their eggs on the trunks and branches of the trees where they live. Females lay their eggs nearby the place where they developed as pupae. The parents die right after the females lay their eggs. (McManus, et al., 1989)
Gypsy moths breed once a year, and live for about 12 months. They are eggs for 8 to 9 months, larvae for 2 to 3 motnhs, and pupae for about 2 weeks. They live about 1 week as adults and then lay eggs. ("Gypsy Moth", 2009)
Gypsy moths larvae stay on the same host tree as they develop. In the first three stages of development, they stay in the tops of the trees. In the last 2 or 3 stages of development, they crawl down the tree during the day and rest under bark or branches. Since they are more vulnerable to predators, they go back up into the treetops at night. Gypsy moth larvae only leave their trees if they blown away or moved by something else. Pupae also stay on the same tree. Once the males come out as adults, they fly through the forest in zigzags looking for females. Then, females attract males with chemicals called pheromones. ("Lymantria dispar (insect)", 2011; McManus, et al., 1989; Munson and Hanson, 1981)
Gypsy moths can fly, even though they spend most of their lives in the same tree. They are also moved around by humans. Big groups of them move from place to place looking for new trees where they can get leaves to eat. Asian gypsy moths can fly a long ways, so they spread quickly. European gypsy moths can't fly, so they take a long time to spread. However, their eggs get moved around on vehicles, equipment, shipping containers, and law furniture. They can also move short distances attached to travelers. Finally, they can crawl to the tops of trees and let the wind carry them a long ways. ("Lymantria dispar (insect)", 2011; McManus, et al., 1989; Munson and Hanson, 1981)
Gypsy moth larvae and pupae stay on the host tree where they hatched. Adults fly to different trees in order to mate. Scientists don't know exactly how big their territories are. (McManus, et al., 1989)
Like most other insects, gypsy moths get information about their environment from sight and touch organs like legs and wings. They can also see ultraviolet light from the sun. After the larvae hatch from eggs, they are drawn to the light and move up the trees where they live. They end up in the tops of the trees and can be moved around by the wind. They communicate using pheromones, which females give off to attract males. Scientists understand this chemical very well and have actually recreated it in laboratories. ("Gypsy Moth", 2009)
Gypsy moths eat the leaves of more than 500 kinds of trees and shrubs. They prefer to eat oak trees, alber broadleaf trees, Douglas firs, and western hemlock needle trees. The mouths of adults aren't completely developed, so only the larvae eat from the trees. ("Gypsy Moth", 2009; "Lymantria dispar (insect)", 2011)
Gypsy moths are eaten by wasps, flies, ground beetles, ants, and spiders. Birds like chickadees, bluejays, nuthatches, towhees, and robins also eat them and compete with them for resouces. In addition, mammals such as white-footed mice, shrews, chipmunks, squirrels, and raccoons are also predators. When there are a lot of gypsy moths, they are also eaten by Calosoma beetles, cuckoos, starling grackles, and red-winged blackbirds. (McManus, et al., 1989)
Gypsy moths eat leaves from trees. They depend on the trees where they live. The more they depend on the tree, the more they eat all of its leaves. They like oak trees best, but can live on and eat most kinds of trees and shrubs. They don't live on ash trees, tulip poplars, or sycamores, and only rarely live on black walnut trees. Gypsy moth populations can also get diseases like wilt diseases, which kills larvae and pupae. ("Gypsy Moth", 2009; "Lymantria dispar (insect)", 2011; McManus, et al., 1989; Munson and Hanson, 1981)
Gypsy moths have go through large, fast increases in their populations, called outbreaks. At first, the number of gypsy moths is low. This can last for several years. In the release phase, the number of gypsy moths increases quickly over 1 to 2 years. Next, there are a lot of gypsy moths, and many of the leaves of the trees are eaten for 1 to 2 years. Then, there are too many gypsy moths, so they end up getting diseases or starve to death. Afterwards, there are very few gypsy moths, and the population returns back to low levels in the first phase. ("Gypsy Moth", 2009; "Lymantria dispar (insect)", 2011; McManus, et al., 1989; Munson and Hanson, 1981)
Gypsy moths are well-known because they are able to eat all of the leaves on almost any kind of tree. If they eat more than half of the leaves on the top of the tree, they usually die. Some trees can survive having all of their trees eaten once or twice, but more than that usually kills the tree. Growing all of the leaves all over again takes a lot of energy for the tree, and trees that have been eaten by gypsy moths are more likely to get attacked by viruses or insect parasites. This costs money for the timber business, removing dead trees, and reducing property values. It can also lead to loss of part of the forest, which causes flooding and loss of species diversity. Since 1970, gypsy moths have destroyed about 30 million hectares of forests in the United States. They are found in most of the eastern United States, and spread 3 to 10 miles per year. This means they will probably be in half of the United States by 2015. In addition, some people are allergic to the hairs on gypsy moth larvae. ("Gypsy Moth", 2009; "Lymantria dispar (insect)", 2011; McManus, et al., 1989)
When gypsy moths defoliate trees, they open up the tops of the trees and reduce overcrowding of trees. ("Lymantria dispar (insect)", 2011)
Gypsy moths are not endangered, vulnerable, or threatened. They are really bad pests and scientists try to figure out how to get rid of them. ("Gypsy Moth", 2009)
Aaron Wasserman (author), University of Michigan-Ann Arbor, Catherine Kent (editor), Special Projects.
living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.
living in the northern part of the Old World. In otherwords, Europe and Asia and northern Africa.
Referring to an animal that lives in trees; tree-climbing.
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends.
uses smells or other chemicals to communicate
used loosely to describe any group of organisms living together or in close proximity to each other - for example nesting shorebirds that live in large colonies. More specifically refers to a group of organisms in which members act as specialized subunits (a continuous, modular society) - as in clonal organisms.
having markings, coloration, shapes, or other features that cause an animal to be camouflaged in its natural environment; being difficult to see or otherwise detect.
a period of time when growth or development is suspended in insects and other invertebrates, it can usually only be ended the appropriate environmental stimulus.
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
parental care is carried out by females
an animal that mainly eats leaves.
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
An animal that eats mainly plants or parts of plants.
animals that have little or no ability to regulate their body temperature, body temperatures fluctuate with the temperature of their environment, often referred to as 'cold-blooded'.
Found in northern North America and northern Europe or Asia.
referring to animal species that have been transported to and established populations in regions outside of their natural range, usually through human action.
A large change in the shape or structure of an animal that happens as the animal grows. In insects, "incomplete metamorphosis" is when young animals are similar to adults and change gradually into the adult form, and "complete metamorphosis" is when there is a profound change between larval and adult forms. Butterflies have complete metamorphosis, grasshoppers have incomplete metamorphosis.
having the capacity to move from one place to another.
the area in which the animal is naturally found, the region in which it is endemic.
active during the night
found in the oriental region of the world. In other words, India and southeast Asia.
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
chemicals released into air or water that are detected by and responded to by other animals of the same species
having more than one female as a mate at one time
breeding is confined to a particular season
remains in the same area
offspring are all produced in a single group (litter, clutch, etc.), after which the parent usually dies. Semelparous organisms often only live through a single season/year (or other periodic change in conditions) but may live for many seasons. In both cases reproduction occurs as a single investment of energy in offspring, with no future chance for investment in reproduction.
reproduction that includes combining the genetic contribution of two individuals, a male and a female
living in residential areas on the outskirts of large cities or towns.
uses touch to communicate
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
Living on the ground.
living in cities and large towns, landscapes dominated by human structures and activity.
uses sight to communicate
United States Department of Agriculture. Diseases of the gypsy moth: How they help to regulate populations. 539. Washington, D.C.: Agriculture Handbook. 1979.
United States Department of the Interior National Park Service. Gypsy Moth. 2. Washington, D.C.: Integrated Pest Management Manual. 2009.
National Biological Information Infrastructure (NBII) and IUCN/SSC Invasive Species Specialist Group (ISSG). Lymantria dispar (insect). 49. Baltimore: Global Invasive Species Database. 2011.
United States Department of Agriculture. The homeowner and the gypsy moth: Guidelines for control. 227. Washington, D.C.: Home and Garden Bulletin. 1979.
Barbosa, P., J. Greenblatt. 1979. Suitability, digestibility and assimilation of various host plants of the gypsy moth Lymantria dispar L.. Oecologia, 43/1: 111-119.
Elkinton, J., W. Healy, J. Buonaccorsi, G. Boettner, A. Hazzard, H. Smith, A. Liebhold. 1996. Interactions among gypsy moths, white-footed mice, and acorns. Ecology, 77/8: 2332-2342.
Gould, J., J. Elkinton, W. Wallner. 1990. Density-dependent suppression of experimentally created gypsy moth, Lymantria dispar (Lepidoptera, Lymantriidae), populations by natural enemies. Journal of Animal Ecology, 59/1: 213-233.
Hajek, A., P. Tobin. 2009. North American Eradications of Asian and European Gypsy Moth. Dordrecht, Netherlands: Springer.
Jones, C., R. Ostfeld, M. Richard, E. Schauber, J. Wolff. 1998. Chain reactions linking acorns to gypsy moth outbreaks and Lyme disease risk. Science, 279/5353: 1023-1026.
Liebhold, A., J. Halverson, G. Elmes. 1992. Gypsy moth invasion in North America — a quantitative analysis. Journal of Biogeography, 19/5: 513-520.
McManus, M., N. Schneeberger, R. Reardon, G. Mason. 1989. Forest Insect and Disease: Gypsy Moth. Washington, D.C.: United States Department of Agriculture Forest Service.
Munson, A., J. Hanson. 1981. Pest Alert: Gypsy Moth. St. Paul, MN: United States Department of Agriculture Forest Service.
Redman, A., J. Scriber. 2000. Competition between the gypsy moth, Lymantria dispar, and the northern tiger swallowtail, Papilio canadensis: interactions mediated by host plant chemistry, pathogens, and parasitoids. Oecologia, 125/2: 218-228.
Reineke, A., C. Zebitz. 1998. Flight ability of gypsy moth females (Lymantria dispar L.) (Lep., Lymantriidae): A behavioural feature characterizing moths from Asia?. Journal of Applied Entomology, 122/6: 307-310.
Roden, D., W. Mattson. 2008. Rapid induced resistance and host species effects on gypsy moth, Lymantria dispar (L.): Implications for outbreaks on three tree species in the boreal forest. Forest Ecology and Management, 255/5-6: 1868-1873.
Rossiter, M. 1991. Maternal effects generate variation in life-history - consequences of egg weight plasticity in the gypsy moth. Functional Ecology, 5/3: 386-393.
Timms, L., S. Smith. 2011. Effects of gypsy moth establishment and dominance in native caterpillar communities of northern oak forests. Canadian Entomologist, 143/5: 479-503.
Work, T., D. McCullough. 2000. Lepidopteran communities in two forest ecosystems during the first gypsy moth outbreaks in northern Michigan. Environmental Entomology, 29/5: 884-900.