Geographic Range
Rosy maple moths are native to North America. The northern extent of their range is
in southern Canada, and they have been recorded in southern Ontario, Quebec, New Brunswick,
Nova Scotia and Prince Edward Island. They range down the East Coast of the United
States through most of Florida. Their range extends west to Michigan, Indiana, Texas,
Kansas, and Nebraska.
Habitat
Rosy maple moths inhabit temperate deciduous forests of eastern North America. They
are most often associated with red maples (
Acer rubrum
), sugar maples (
Acer saccharum
), silver maples (
Acer saccharinum
), turkey oaks (
Quercus laevis
) and box elder maples (
Acer negundo
). Depending on where their host trees are, rosy maple moths have also been found
in suburban areas.
- Habitat Regions
- temperate
- Terrestrial Biomes
- forest
- Other Habitat Features
- suburban
Physical Description
Adult rosy maple moths are extremely variable in color. Coloration in adults can range
from unmarked white to bright yellow with dark pink maculation. The woolly body of
rosy maple moths varies in color from bright yellow, to cream, to white. Their ventral
side, legs, and antennae are usually rose pink. Upper wing color is also very variable;
ranging from yellow to cream, to white with pink at the margins and bases of the wing.
The amount of pink maculation on the wings ranges from dominant to nearly absent.
Polymorphism does occur within different geographic regions. Unique to Missouri, subspecies
alba
is either all white or white with very faint pink maculation.
Sexual dimorphism is present in wing shape and span of rosy maple moths. Males have
slightly narrower wings compared to females, and also have less rounded hindwings.
Ornamentation differences are also present. Males have bipectinate antennae, while
females have simple antennae. Both male and female rosy maple moths have an average
wingspan of 32 to 55 mm. Male forewing length ranges from 17 to 29 mm. The last instar
ranges from 38 mm to 55 mm in length.
Rosy maple moth caterpillars, also known as green-striped mapleworms, have different
coloration depending on their stage of development. Early stage larvae have black
heads and bodies that are yellowish-cream with faint longitudinal green stripes. Fully-grown
caterpillars have beige to bright red heads. Their bodies are yellow-green with seven
dark green lines running lengthwise. The longitudinal line coloration can also range
from frosty blue to blue green, or black. Prominent black horns are located dorsally
on the second thoracic segment. Two rows of short spines run along each side of the
body and the terminal abdominal segments have four larger spines. Other moths in the
same family (
Saturniidae
) have similar horned larvae, but lack the stunning color of rosy maple moths.
- Other Physical Features
- ectothermic
- homoiothermic
- bilateral symmetry
- polymorphic
- Sexual Dimorphism
- sexes alike
- sexes shaped differently
- ornamentation
Development
Female rosy maple moths lay their fertilized eggs 24 hours after mating on the underside
of the host leaf and then depart. After 2 weeks, the larvae hatch. Rosy maple moth
larvae go through five instar stages. During the first three instars, the larvae live
and eat together. Only by the 4th instar do the larvae feed independently. During
the early instars, the larvae have shiny black heads and yellow bodies with black
dorsal lines running vertically. The second body segments of the larvae have two yellow
tubercles, each terminating with two setae. Their bodies are sparsely covered with
short setae. Their legs are black and have yellow tips. As they pass through the second
and third instars, their body color and stripes begin to darken. Between 6 to 11 days
after hatching, the brood molts and emerges with deeper colors, two long black dorsal
horns near their head, and 6 short but sharp spines on the rest of the segments. About
12 days after hatching, the larvae undergo another molt. This molt leaves the larvae
relatively the same in appearance. About 1 week later, the larvae undergo a third
molt and emerge with brown heads and varied body colors. The body colors range from
dark and light green, black and green, and black and yellow. Spotting also occurs
in their first segments. Pupation occurs 10 to 14 days after the third molt. Pupae
stages vary in length from 4 to 7 days.
- Development - Life Cycle
- metamorphosis
Reproduction
Mating behaviors of rosy maple moths are not well understood. Adults come out in the
late afternoon or early evening and mate at night. Fertilization is internal. The
following dusk, females lay their fertilized eggs. Females lay their eggs on the underside
of host tree leaves, such as the leaves of the sugar maple tree (
Acer saccharinum
). Rosy maple moths have a polygyandrous mating system where females and males mate
with different partners throughout the breeding season. For each new brood, rosy maple
moth females find a different male.
- Mating System
- polygynandrous (promiscuous)
Sexually mature adult rosy maple moths emerge from pupae from mid-May through mid-July.
Oviposition peaks in early July. Rosy maple moths are oviparous, and females lay eggs
24 hours after internal fertilization by the male. Females lay 150 to 200 eggs after
fertilization and deposit them in clusters of 10 to 30 on the underside of the host
leaf. The larvae hatch after 2 weeks and live and feed gregariously until the final
instars. Larvae feed until mid-August at the latest. Overwinter pupation can occur.
If this happens, the pupae burrow into the soil and wait for more favorable conditions
to emerge. Rosy maple moths are sexually mature at 2 to 9 months.
Egg-laying occurs at different times in the year depending on the region inhabited
by the females. In Canada and northern regions of the United States, females lay one
brood from May to August. In the southern states, females lay two broods from April
to September. In the Deep South including Florida, females lay three broods from March
to October.
- Key Reproductive Features
- seasonal breeding
- sexual
- fertilization
- broadcast (group) spawning
- oviparous
Parental care is nearly absent in rosy maple moths. During the 24 hours after fertilization
but before the female lays her eggs, she will yolk and protect her eggs inside her
body. Females lay their eggs on the underside of the leaves of the host tree and leave.
Males do nothing more than fertilize the eggs.
- Parental Investment
- female parental care
-
pre-fertilization
- provisioning
-
protecting
- female
-
pre-hatching/birth
-
provisioning
- female
-
protecting
- female
-
provisioning
Lifespan/Longevity
Lifespan of rosy maple moths ranges from 2 to 9 months in the wild if overwinter pupation
occurs. Typically, rosy maple moths raised in captivity have a shorter lifespan of
around 2 to 5 months. In the wild, much of their life is spent overwintering in the
pupal stage. In captivity, there is no need to overwinter due to unfavorable conditions.
Behavior
Rosy maple moths are nocturnal and mainly solitary except during mating. Adults enter
a stage of torpor during the morning and afternoon. They come out in the late afternoon
and mate in the late evening. At night, females emit pheromones to attract males.
Females lay eggs at dusk the day after mating. Adult rosy maple moths usually fly
during the first third of the night. Early rosy maple moth larvae feed together but
are not considered to feed in colonies. The larvae become solitary feeders as they
develop into late-stage caterpillars. Fully-grown caterpillars use the winter to pupate
in shallow holes underground.
- Key Behaviors
- arboreal
- flies
- nocturnal
- motile
- hibernation
- daily torpor
- solitary
Home Range
Adult rosy maple moths inhabit a large range since they do not require food, but the
exact size of the range is unknown. Larvae and caterpillars live on the same tree
they hatched on. The larvae eat only the leaves and usually stay on the underside
of the leaves.
Communication and Perception
Sensory receptors of rosy maple moths are concentrated in the antennae, legs and palps.
Adults use receptors to smell pheremones of the opposite sex when it is time to mate.
Because adult rosy maple moths do not feed, their receptors are not used for finding
food and are concentrated for reproductive purposes. Rosy maple moths are equipped
with compound eyes and simple eyes, which allow them to see ultraviolet rays. However,
the complexity of the eye changes with each developmental stage. Green-striped maple
worms, their caterpillars, only have simple eyes that can differentiate between light
and dark. Thus, their vision is poor. Adults and caterpillars both use their many
setae to relay tactile information about their environment to the brain. Adults also
use their body and antennae setae to sense the direction of the wind while flying.
Rosy maple moths lack organs to process auditory sounds. As caterpillars and adults,
rosy maple moths use their bright coloration as a warning sign and to seem distasteful
to predators.
- Other Communication Modes
- pheromones
Food Habits
Adult rosy maple moths do not feed. The trees that females laid their eggs under become
the host for the developing larvae. The early larvae feed in union, however, larvae
become solitary feeders in the later stages. During the molting process, caterpillars
feed on the undersides of the maple tree (
Acer
) or leaves of oak trees (
Quercus
). The larvae and caterpillars are folivorous, and consume the entire leaf blade.
- Plant Foods
- leaves
Predation
Rosy maple moths lay eggs on the underside of leaves so as to shield them from the
eyes of hungry birds. Green-striped mapleworms exhibit aposematic coloring in their
black spikes and red head. They also have cryptic coloration since they are a bright
green; typically the color of the leaves they live and feed on. Adult rosy maple moths
exhibit aposematic behavior with their bright yellow and pink coloring. Among bluejays
(
Cyanocitta cristata
), black-capped chickadees (
Poecile atricapillus
), and tufted titmouses (
Baeolophus bicolor
), bluejays are the most successful predators of rosy maple moths. Field studies have
shown that rosy maple moths have low acceptability to birds. The main predators of
rosy maple moths and caterpillars are the local birds.
- Anti-predator Adaptations
- aposematic
- cryptic
Ecosystem Roles
Since adult rosy maple moths do not eat, they not impact the ecosystem as predators.
Larvae and caterpillars, however, can be pests when occurring in large numbers on
the leaves of maple and oak species, including sugar maples (
Acer saccharum
), red maples (
Acer rubrum
), silver maples (
Acer saccharinum
), elder box maples (
Acer negundo
), and oak trees (
Quercus cerris
). Several bird species prey on rosy maple moth larvae, but bird predation is not
intense enough to slow the population buildup. Some parasites have accumulated in
the larvae, such as one species of parasitic wasp (
Hyposoter fugitivus
) and one species of fly (
Achaetoneura frenchii
). The parasites are not abundant enough to affect the population size of the green-striped
mapleworms.
- sugar maples ( Acer saccharum )
- red maples ( Acer rubrum )
- silver maples ( Acer saccharinum )
- elder box maples ( Acer negundo )
- oak trees ( Quercus cerris )
- flies ( Achaetoneura frenchii )
- wasps ( Hyposoter fugitivus )
Economic Importance for Humans: Positive
There are no known positive economic impacts of rosy maple moths on humans.
Economic Importance for Humans: Negative
Adult rosy maple moths are not known to have negative economic impacts on humans.
However, larvae are defoliators capable of defoliating their host trees during a population
explosion. If two generations are produced in a single year, host trees can be completely
stripped of leaves twice. Typically this does not kill or permanently damage the tree.
Nonetheless, this can defoliate acres of trees in a short time period if accompanied
by another other hardwood defoliator, saddled prominent moths (
Heterocampa guttivitta
). In addition rosy maple moth larvae can be a nuisance to decorative trees as house
pests.
- Negative Impacts
- household pest
Conservation Status
Rosy maple moths are not considered threatened or endangered.
Additional Links
Contributors
Alicia Damele (author), University of Michigan-Ann Arbor, Catherine Kent (editor), Special Projects.
- Nearctic
-
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.
- native range
-
the area in which the animal is naturally found, the region in which it is endemic.
- temperate
-
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).
- forest
-
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
- suburban
-
living in residential areas on the outskirts of large cities or towns.
- ectothermic
-
animals which must use heat acquired from the environment and behavioral adaptations to regulate body temperature
- bilateral symmetry
-
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. Synapomorphy of the Bilateria.
- polymorphic
-
"many forms." A species is polymorphic if its individuals can be divided into two or more easily recognized groups, based on structure, color, or other similar characteristics. The term only applies when the distinct groups can be found in the same area; graded or clinal variation throughout the range of a species (e.g. a north-to-south decrease in size) is not polymorphism. Polymorphic characteristics may be inherited because the differences have a genetic basis, or they may be the result of environmental influences. We do not consider sexual differences (i.e. sexual dimorphism), seasonal changes (e.g. change in fur color), or age-related changes to be polymorphic. Polymorphism in a local population can be an adaptation to prevent density-dependent predation, where predators preferentially prey on the most common morph.
- sexual ornamentation
-
one of the sexes (usually males) has special physical structures used in courting the other sex or fighting the same sex. For example: antlers, elongated tails, special spurs.
- metamorphosis
-
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.
- polygynandrous
-
the kind of polygamy in which a female pairs with several males, each of which also pairs with several different females.
- seasonal breeding
-
breeding is confined to a particular season
- sexual
-
reproduction that includes combining the genetic contribution of two individuals, a male and a female
- fertilization
-
union of egg and spermatozoan
- internal fertilization
-
fertilization takes place within the female's body
- oviparous
-
reproduction in which eggs are released by the female; development of offspring occurs outside the mother's body.
- female parental care
-
parental care is carried out by females
- arboreal
-
Referring to an animal that lives in trees; tree-climbing.
- nocturnal
-
active during the night
- motile
-
having the capacity to move from one place to another.
- hibernation
-
the state that some animals enter during winter in which normal physiological processes are significantly reduced, thus lowering the animal's energy requirements. The act or condition of passing winter in a torpid or resting state, typically involving the abandonment of homoiothermy in mammals.
- solitary
-
lives alone
- visual
-
uses sight to communicate
- tactile
-
uses touch to communicate
- chemical
-
uses smells or other chemicals to communicate
- pheromones
-
chemicals released into air or water that are detected by and responded to by other animals of the same species
- visual
-
uses sight to communicate
- tactile
-
uses touch to communicate
- chemical
-
uses smells or other chemicals to communicate
- aposematic
-
having coloration that serves a protective function for the animal, usually used to refer to animals with colors that warn predators of their toxicity. For example: animals with bright red or yellow coloration are often toxic or distasteful.
- cryptic
-
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.
- herbivore
-
An animal that eats mainly plants or parts of plants.
- folivore
-
an animal that mainly eats leaves.
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