Winter Moth
Encyclopedia
The Winter Moth is a moth
of the family Geometridae. It is an abundant species of Europe
and the Near East
and one of very few Lepidoptera
of temperate regions in which the adults are active in the depth of winter.
The female of this species is virtually wingless and cannot fly, but the male is fully winged and flies strongly. Its wingspan
is 28–33 mm with alternating pale buff and darker brown fascia
on the forewings and a similar pattern, but much paler, on the hindwings. The adults are active at night throughout the winter from October to February. Males are strictly nocturnal and attracted to light and females.
After mating, females lay their eggs in tree bark crevices or in other sheltered locations, and all adults die. The eggs hatch in the spring when temperatures average around 13°C (55°F). After hatching, the young larvae crawl up tree trunks and produce silken thread that can carry them in the wind to new areas. This dispersal method, called "ballooning," is common among defoliators.
The caterpillar
s are green loopers with pale lines on the sides and a darker one along the top. They will feed on virtually any tree
or shrub
(see list below) and can be a serious pest
in apple
orchard
s. Generally, their feeding is completed by mid-June.
Winter Moths are considered an invasive species
in North America
; Nova Scotia experienced the first confirmed infestations in the 1930s. The moth is now found in British Columbia
, Washington, Oregon
, New Brunswick
, Prince Edward Island
, and Massachusetts
. In Massachusetts, the moths have attracted the attention of several media outlets due to the severity of the infestation. There have been unconfirmed reports of infestations in southern New Hampshire
and northern Rhode Island
.
Moth
A moth is an insect closely related to the butterfly, both being of the order Lepidoptera. Moths form the majority of this order; there are thought to be 150,000 to 250,000 different species of moth , with thousands of species yet to be described...
of the family Geometridae. It is an abundant species of Europe
Europe
Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...
and the Near East
Near East
The Near East is a geographical term that covers different countries for geographers, archeologists, and historians, on the one hand, and for political scientists, economists, and journalists, on the other...
and one of very few Lepidoptera
Lepidoptera
Lepidoptera is a large order of insects that includes moths and butterflies . It is one of the most widespread and widely recognizable insect orders in the world, encompassing moths and the three superfamilies of butterflies, skipper butterflies, and moth-butterflies...
of temperate regions in which the adults are active in the depth of winter.
The female of this species is virtually wingless and cannot fly, but the male is fully winged and flies strongly. Its wingspan
Wingspan
The wingspan of an airplane or a bird, is the distance from one wingtip to the other wingtip. For example, the Boeing 777 has a wingspan of about ; and a Wandering Albatross caught in 1965 had a wingspan of , the official record for a living bird.The term wingspan, more technically extent, is...
is 28–33 mm with alternating pale buff and darker brown fascia
Fascia
A fascia is a layer of fibrous tissue that permeates the human body. A fascia is a connective tissue that surrounds muscles, groups of muscles, blood vessels, and nerves, binding those structures together in much the same manner as plastic wrap can be used to hold the contents of sandwiches...
on the forewings and a similar pattern, but much paler, on the hindwings. The adults are active at night throughout the winter from October to February. Males are strictly nocturnal and attracted to light and females.
After mating, females lay their eggs in tree bark crevices or in other sheltered locations, and all adults die. The eggs hatch in the spring when temperatures average around 13°C (55°F). After hatching, the young larvae crawl up tree trunks and produce silken thread that can carry them in the wind to new areas. This dispersal method, called "ballooning," is common among defoliators.
Caterpillar
Caterpillars are the larval form of members of the order Lepidoptera . They are mostly herbivorous in food habit, although some species are insectivorous. Caterpillars are voracious feeders and many of them are considered to be pests in agriculture...
s are green loopers with pale lines on the sides and a darker one along the top. They will feed on virtually any tree
Tree
A tree is a perennial woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or trunk with clear apical dominance. A minimum height specification at maturity is cited by some authors, varying from 3 m to...
or shrub
Shrub
A shrub or bush is distinguished from a tree by its multiple stems and shorter height, usually under 5–6 m tall. A large number of plants may become either shrubs or trees, depending on the growing conditions they experience...
(see list below) and can be a serious pest
Pest (animal)
A pest is an animal which is detrimental to humans or human concerns. It is a loosely defined term, often overlapping with the related terms vermin, weeds, parasites and pathogens...
in apple
Apple
The apple is the pomaceous fruit of the apple tree, species Malus domestica in the rose family . It is one of the most widely cultivated tree fruits, and the most widely known of the many members of genus Malus that are used by humans. Apple grow on small, deciduous trees that blossom in the spring...
orchard
Orchard
An orchard is an intentional planting of trees or shrubs that is maintained for food production. Orchards comprise fruit or nut-producing trees which are grown for commercial production. Orchards are also sometimes a feature of large gardens, where they serve an aesthetic as well as a productive...
s. Generally, their feeding is completed by mid-June.
Winter Moths are considered an invasive species
Invasive species
"Invasive species", or invasive exotics, is a nomenclature term and categorization phrase used for flora and fauna, and for specific restoration-preservation processes in native habitats, with several definitions....
in North America
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...
; Nova Scotia experienced the first confirmed infestations in the 1930s. The moth is now found in British Columbia
British Columbia
British Columbia is the westernmost of Canada's provinces and is known for its natural beauty, as reflected in its Latin motto, Splendor sine occasu . Its name was chosen by Queen Victoria in 1858...
, Washington, Oregon
Oregon
Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...
, New Brunswick
New Brunswick
New Brunswick is one of Canada's three Maritime provinces and is the only province in the federation that is constitutionally bilingual . The provincial capital is Fredericton and Saint John is the most populous city. Greater Moncton is the largest Census Metropolitan Area...
, Prince Edward Island
Prince Edward Island
Prince Edward Island is a Canadian province consisting of an island of the same name, as well as other islands. The maritime province is the smallest in the nation in both land area and population...
, and Massachusetts
Massachusetts
The Commonwealth of Massachusetts is a state in the New England region of the northeastern United States of America. It is bordered by Rhode Island and Connecticut to the south, New York to the west, and Vermont and New Hampshire to the north; at its east lies the Atlantic Ocean. As of the 2010...
. In Massachusetts, the moths have attracted the attention of several media outlets due to the severity of the infestation. There have been unconfirmed reports of infestations in southern New Hampshire
New Hampshire
New Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...
and northern Rhode Island
Rhode Island
The state of Rhode Island and Providence Plantations, more commonly referred to as Rhode Island , is a state in the New England region of the United States. It is the smallest U.S. state by area...
.
Recorded food plants
- Acer - MapleMapleAcer is a genus of trees or shrubs commonly known as maple.Maples are variously classified in a family of their own, the Aceraceae, or together with the Hippocastanaceae included in the family Sapindaceae. Modern classifications, including the Angiosperm Phylogeny Group system, favour inclusion in...
- Amelanchier
- Betula - BirchBirchBirch is a tree or shrub of the genus Betula , in the family Betulaceae, closely related to the beech/oak family, Fagaceae. The Betula genus contains 30–60 known taxa...
- CallunaCallunaCalluna vulgaris is the sole species in the genus Calluna in the family Ericaceae. It is a low-growing perennial shrub growing to tall, or rarely to and taller, and is found widely in Europe and Asia Minor on acidic soils in open sunny situations and in moderate shade...
- Heather - Carpinus - European HornbeamEuropean HornbeamCarpinus betulus is a hornbeam native to eastern, western, central and southern England. It requires a warm climate for good growth, and occurs only at elevations up to 600 metres...
- Castanea - ChestnutChestnutChestnut , some species called chinkapin or chinquapin, is a genus of eight or nine species of deciduous trees and shrubs in the beech family Fagaceae, native to temperate regions of the Northern Hemisphere. The name also refers to the edible nuts they produce.-Species:The chestnut belongs to the...
- Corylus - HazelHazelThe hazels are a genus of deciduous trees and large shrubs native to the temperate northern hemisphere. The genus is usually placed in the birch family Betulaceae, though some botanists split the hazels into a separate family Corylaceae.They have simple, rounded leaves with double-serrate margins...
- CotoneasterCotoneasterCotoneaster is a genus of woody plants in the rose family, Rosaceae, native to the Palaearctic region , with a strong concentration of diversity in the genus in the mountains of southwestern China and the Himalayas...
- Crataegus - HawthornCrataegusCrataegus , commonly called hawthorn or thornapple, is a large genus of shrubs and trees in the rose family, Rosaceae, native to temperate regions of the Northern Hemisphere in Europe, Asia and North America. The name hawthorn was originally applied to the species native to northern Europe,...
- Cydonia - QuinceQuinceThe quince , or Cydonia oblonga, is the sole member of the genus Cydonia and native to warm-temperate southwest Asia in the Caucasus region...
- Fagus - BeechBeechBeech is a genus of ten species of deciduous trees in the family Fagaceae, native to temperate Europe, Asia and North America.-Habit:...
- Fraxinus - AshAsh treeFraxinus is a genus flowering plants in the olive and lilac family, Oleaceae. It contains 45-65 species of usually medium to large trees, mostly deciduous though a few subtropical species are evergreen. The tree's common English name, ash, goes back to the Old English æsc, while the generic name...
- Larix - European LarchEuropean LarchLarix decidua, common name European larch, is a species of larch native to the mountains of central Europe, in the Alps and Carpathians, with disjunct lowland populations in northern Poland and southern Lithuania.-Description:...
- MalusMalusMalus , the apples, are a genus of about 30–35 species of small deciduous trees or shrubs in the family Rosaceae. Other studies go as far as 55 species including the domesticated Orchard Apple, or Table apple as it was formerly called...
- Apple - MyricaMyricaMyrica is a genus of about 35–50 species of small trees and shrubs in the family Myricaceae, order Fagales. The genus has a wide distribution, including Africa, Asia, Europe, North America and South America, and missing only from Australasia...
- OstryaOstryaOstrya is a genus of eight to ten small deciduous trees belonging to the birch family Betulaceae. Its common name is Hophornbeam in American English and Hop-hornbeam in British English. It may also be called ironwood, a name shared with a number of other plants.The genus is native in southern...
- Picea - Norway SpruceNorway SpruceNorway Spruce is a species of spruce native to Europe. It is also commonly referred to as the European Spruce.- Description :...
- Populus - PoplarPoplarPopulus is a genus of 25–35 species of deciduous flowering plants in the family Salicaceae, native to most of the Northern Hemisphere. English names variously applied to different species include poplar , aspen, and cottonwood....
- PrunusPrunusPrunus is a genus of trees and shrubs, which includes the plums, cherries, peaches, apricots and almonds. There are around 430 species spread throughout the northern temperate regions of the globe. Many members of the genus are widely cultivated for fruit and ornament.-Botany:Members of the genus...
- Pyrus - PearPearThe pear is any of several tree species of genus Pyrus and also the name of the pomaceous fruit of these trees. Several species of pear are valued by humans for their edible fruit, but the fruit of other species is small, hard, and astringent....
- Quercus - OakOakAn oak is a tree or shrub in the genus Quercus , of which about 600 species exist. "Oak" may also appear in the names of species in related genera, notably Lithocarpus...
- Rhamnus - BuckthornBuckthornThe Buckthorns are a genus of about 100 species of shrubs or small trees from 1-10 m tall , in the buckthorn family Rhamnaceae...
- RhododendronRhododendronRhododendron is a genus of over 1 000 species of woody plants in the heath family, most with showy flowers...
- RibesRibesRibes is a genus of about 150 species of flowering plants native throughout the temperate regions of the Northern Hemisphere. It is usually treated as the only genus in the family Grossulariaceae. Seven subgenera are recognized....
- Currant - Rosa - Rugosa RoseRugosa RoseRosa rugosa is a species of rose native to eastern Asia, in northeastern China, Japan, Korea and southeastern Siberia, where it grows on the coast, often on sand dunes.-Vernacular names:...
- Rubus - RaspberryRaspberryThe raspberry or hindberry is the edible fruit of a multitude of plant species in the genus Rubus, most of which are in the subgenus Idaeobatus; the name also applies to these plants themselves...
- Salix - WillowWillowWillows, sallows, and osiers form the genus Salix, around 400 species of deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions of the Northern Hemisphere...
- SorbusSorbusSorbus is a genus of about 100–200 species of trees and shrubs in the subfamily Maloideae of the Rose family Rosaceae. Species of Sorbus are commonly known as whitebeam, rowan, service tree, and mountain ash...
- TiliaTiliaTilia is a genus of about 30 species of trees native throughout most of the temperate Northern Hemisphere. The greatest species diversity is found in Asia, and the genus also occurs in Europe and eastern North America, but not western North America...
- Lime - Ulmus - ElmElmElms are deciduous and semi-deciduous trees comprising the genus Ulmus in the plant family Ulmaceae. The dozens of species are found in temperate and tropical-montane regions of North America and Eurasia, ranging southward into Indonesia. Elms are components of many kinds of natural forests...
- ViburnumViburnumViburnum is a genus of about 150–175 species of shrubs or small trees in the moschatel family, Adoxaceae. Its current classification is based on molecular phylogeny...