Sycamore Moth: All You Need to Know for a Fluttering Experience

The Sycamore Moth is a fascinating creature that you might have encountered in your garden or during a walk in the woods. With its striking appearance and unique life cycle, it’s an insect that often captures the attention of nature enthusiasts.

When you first spot a Sycamore Moth, you’ll likely notice its distinctive features. The adult moths have bright white wings with dark brown markings, creating an eye-catching contrast. As for the caterpillars, they are adorned with bright, colorful hairs that help to deter predators.

In addition to their appearance, Sycamore Moths have an interesting life cycle. They lay their eggs on the leaves of sycamore trees, which provide the growing caterpillars with an abundant food supply. As the caterpillars feed, they eventually grow large enough to spin a cocoon and transform into adult moths, starting the cycle anew.

General Overview

The Sycamore Moth (Acronicta aceris) is a unique moth species belonging to the Noctuidae family. With their distinct white, grey, light yellow color pattern, these moths are easily recognizable.

Their wingspan typically ranges between 40 and 50 millimeters, giving them an elegant appearance. As a part of the Systema Naturae, this species showcases intriguing characteristics.

Some features of the Sycamore Moth include:

  • Distinct color pattern on their wings
  • White, grey, and light yellow shades
  • Wingspan ranging from 40 to 50 millimeters

The Sycamore Moth is often compared to other moths within the Noctuidae family. To give you a better understanding, here’s a comparison table:

Feature Sycamore Moth Other Noctuidae Moths
Wingspan 40-50 millimeters Variable
Color Pattern White, grey, light yellow Variable

By learning more about the Sycamore Moth, you can appreciate its unique characteristics, and further understand its place within the diverse world of moths.

Lifestages of Sycamore Moth


During the reproduction season, female sycamore moths lay their eggs on the leaves of their prefered host plants, such as sycamores, horse-chestnut, maples, poplars, and large-leaved limes. These eggs hatch into caterpillars within a short period.

Larva Stage

The larva, also known as a caterpillar, has distinct features such as:

  • Bright orange hairs on their body
  • A preference for munching on sycamore, horse-chestnut, and maples

They may also feed on mulberry, pedunculate oak, and poplar leaves as alternatives. As the caterpillar matures, it goes through a series of molts, shedding its old skin for a new one to accommodate its growth.

Pupa Stage

After the caterpillar has grown and reached its final instar, it’s time for the pupa stage. During this phase, the caterpillar:

  • Seeks a safe and secluded spot, such as leaf litter or tree crevices
  • Forms a cocoon using silk and hairs

Inside the cocoon, the caterpillar undergoes metamorphosis and transforms into an adult moth. This process may take a couple of weeks.

Adult Moth Stage

Once the transformation is complete, the adult sycamore moth emerges from its cocoon. This nocturnal insect has unique features, such as:

  • Forewings and hindwings with dark streaks and indistinct markings
  • Slight sexual dimorphism, with males having a larger wingspan

The ground colour on the wings often varies between individuals, ranging from dark sooty-grey to pale grey. The scientific name for the species is Acronicta aceris.

In summary, the sycamore moth goes through four distinct stages: eggs, larva (caterpillar), pupa (cocoon), and adult. Each stage plays an essential role in the development and survival of these fascinating creatures. Understanding these lifestages allows for better insights into the world of sycamore moths and their impact on the ecosystem.

Distribution and Habitat

The Sycamore Moth (Acronicta aceris) can be found in various regions throughout its distribution range. In Europe, it’s widespread across central England and extends to the British Isles, Cyprus, and Morocco1. The moth also inhabits areas in the Middle East and Western Asia, including the Near East.

The natural habitat of the Sycamore Moth is primarily in deciduous forests, where its primary host plant, the sycamore tree (Platanus occidentalis), grows abundantly2. These moths have adapted well to various climates and environmental conditions, including urban landscapes with green spaces.

They prefer spaces where:

  • Sycamore trees are abundant
  • Deciduous forests with a mix of tree species
  • Open, green areas in urban environments

Here’s a brief comparison of different distribution areas:

Region Distribution Habitat
England Central and South Deciduous forests, urban green spaces
Europe Widespread Deciduous forests, wooded areas, urban parks
Middle East Western Asia Forested regions, mixed woodlands
British Isles Common Woodlands, hedgerows, gardens
Cyprus Occasional Deciduous forests, urban green spaces
Morocco Limited Highland forests, wooded areas

In summary, the Sycamore Moth is widely distributed across various regions, with a preference for deciduous forests and areas abundant in sycamore trees. They can also adapt to urban environments, making them a versatile species.

Behaviour and Characteristics

The Sycamore Moth is an intriguing species, and understanding its behavior can be quite fascinating. Let’s explore some aspects of its life and characteristics.

Season and Flight Pattern

You’ll usually spot Sycamore Moths during their active season, which is from June to August. As we enter late summer and early autumn, their population starts to decline. When observing their flight, you’ll notice that they tend to have a distinguishable flight pattern.

Lifespan of Adults

One aspect to consider is the lifespan of adult Sycamore Moths. While their time as adults may be brief, you’ll find it interesting to know that they each play their part in the life cycle of the species.

Cookies and Sycamore Moths

While you may wonder how cookies fit into the picture, it’s important to keep in mind the overall goal of understanding Sycamore Moths in a wholesome manner. In this context, cookies may not seem relevant. However, exploring all aspects of this species can truly help improve your knowledge and appreciation for these fascinating creatures.

So, there you have it—a brief yet informative overview of the behavior and characteristics of Sycamore Moths. Keep an eye out for them in the months of June to August and observe their flight patterns to truly appreciate the beauty of their existence.

Predation and Defenses


Sycamore Moth caterpillars can fall prey to various predators, such as birds, spiders, and parasitic wasps. To protect themselves, these caterpillars have evolved some defense mechanisms.

Skin Irritation

One key defense mechanism is the potential to cause skin irritation. The caterpillar’s hairs, or setae, can cause itching and discomfort when they come into contact with a predator or human skin. This can deter predators from further attacking or consuming the caterpillar. It is important to be careful while handling these caterpillars and avoid direct contact with bare skin.


Sycamore Moths can also protect themselves by overcoming harsh weather conditions. The caterpillar stage of this moth overwinters, which means they can survive colder seasons when food resources are scarce and predators may struggle to find sustenance. This ability helps in increasing their survival chances.

Fully Grown Caterpillars

When fully grown, these caterpillars display a bright and distinct color pattern. This could serve as a form of warning coloration, signaling potential predators that it’s not an ideal meal. Additionally, fully grown caterpillars are more prepared to defend themselves against predators and face the environmental challenges they may encounter.

Key Features:

  • Predators: birds, spiders, parasitic wasps
  • Defense mechanisms: skin irritation, overwintering, warning coloration
  • Fully grown caterpillars have better survival chances

In conclusion, the Sycamore Moth’s caterpillars have evolved several defense mechanisms to protect themselves against predators and environmental challenges. Remember to handle them carefully and appreciate their unique adaptations as they play a crucial role in their survival.

Other Species of Interest

In the fascinating world of moths, you might come across various intriguing species. Some of them closely resemble the Sycamore Tussock Moth (Halysidota harrisii), while others belong to similar subfamilies, like Acronictinae. Let’s briefly look at some of these captivating creatures.

1. The Miller

  • Also known as Acronicta leporina
  • Similar to dagger moths
  • Spotted forewings and furry body

2. Poplar Grey

  • Scientific name: Acronicta megacephala
  • Specialized for nocturnal environments
  • Beautiful combination of grey, brown, and white shades

3. Acronictinae Owlet Moths

  • Large, diverse subfamily of Noctuidae
  • Includes popular species like Alder Moths, Dark Dagger, Grey Dagger, and Knot Grass Moths
  • Unique wing patterns and body shapes

4. Dagger Moths

  • Categorized as Acronicta species
  • Distinct dagger-shaped marks on their wings
  • Brown coloring with varied shadow patterns

5. Sycamore Tussock Moth

  • Official name: Halysidota harrisii
  • Attractive appearance with tufts of hair and bold patterns
  • Caterpillars feed on sycamore leaves

Here’s a comparison table to help you appreciate the key features of these captivating moth species:

Species Scientific Name Key Features
The Miller Acronicta leporina Spotted forewings, furry body
Poplar Grey Acronicta megacephala Nocturnal adaptation, grey shades
Acronictinae Owlet Moths Diverse patterns, large subfamily
Dagger Moths Acronicta species Dagger shapes, brown coloring
Sycamore Tussock Moth Halysidota harrisii Bold patterns, tufts of hair

With this information, you can now distinguish these fascinating moth species from each other and appreciate their unique characteristics. Happy moth-watching!


In summary, the Sycamore Moth is a fascinating creature. It can thrive in various environments, including urban areas and woodland habitats. You might have encountered its distinctive caterpillars with their vibrant colors and hair tufts.

Here are a few key takeaways about the Sycamore Moth:

  • Sycamore Moths belong to the Drepanidae family.
  • The larvae feed on sycamore and maple leaves.
  • The adult moths are nocturnal, making them more challenging to spot.

In the world of moths, the Sycamore Moth stands out with its unique caterpillars and interesting life cycle. Next time you’re outdoors near sycamore or maple trees, keep an eye out for these fascinating creatures.




Reader Emails

Over the years, our website, has received hundreds of letters and some interesting images asking us about these insects. Scroll down to have a look at some of them.

Letter 1 – Sycamore Borers


Subject: Mystery Bugs. Temporary Name: Fuzzy Fellas
Location: Close to the beach In Solana Beach
October 26, 2015 9:28 am
Hi i found this bug over the summer while volunteering at a camp. These little bugs were all over. They look like a wasp but where the stinger was suppose to be there was fuzz. Because I was a helper to children we named them fuzzy fellas. I held them all the time and they never bit me or stung, just to be safe I didn’t let any of them hold it. These can fly but are pretty calm. I found that the most came out in the late morning, and less than that in the afternoon. I have searched everywhere to find out what theses little bugs are. Help please? Thanks!
Signature: -Kara Beth

Sycamore Borer
Sycamore Borer

Dear Kara Beth,
You are quite brave.  Though they are very effective wasp mimics, Clearwing Moths in the family Sesiidae are quite harmless, though they really do resemble stinging wasps.  Your individuals are Sycamore Borers,
Synanthedon resplendens, a species we originally identified from Encinitas in 2014.  According to University of California Integrated Pest Management System:  “The sycamore borer, Synanthedon resplendens, occurs in the southwestern United States. It is prevalent in sycamore and also infests oak and ceanothus. The male is mostly yellow with a brownish-black head and black bands on its body. Its legs are yellow, except for black along the margins on the portions nearest to the body. The mostly clear wings have orangish to yellow margins. Sycamores tolerate extensive boring by this insect, and generally no control is recommended.”

Sycamore Borers
Sycamore Borers

Letter 2 – Sycamore Moth Caterpillar


Peculiar Hairy Orange Caterpillar Found in Belgium
Hello dear bugsir,
Recently, my parents witnessed a peculiar orange caterpillar falling from out of the tree in our garden, right here in Kapellen, province of Antwerp, in Belgium, and they took some pictures of it. I would like to apologize for the bad, blurry, unclear quality of 3 of those pictures, since my parents aren’t professional photographers (they aren’t even amateurs …). The only clear one is the last one (and it almost can be used as a decent wallpaper!). I was very intrigued when i looked at those pictures, because here in Belgium, our insects dont look that colourful, or exotic. It does seem very out of place here. I’ve tried searching some sites (i even looked at all of the caterpillar pictures on your site) but no info came up about this species. I really want to know what type of caterpillar it is, and if those hairs are venomous or not, because i have a little phobia of caterpillars. So if i walk under under tree and this beast falls in my neck, i really want to know its name and what effect those hairs give, before i start to run off and scream like a girl. Regards,
Bart from Belgium

Hi Bart from Belgium,
We did identify this species of Punk Rock Caterpillar in August 2006. It is on our caterpillar 6 page. It is a Sycamore Moth Caterpillar, Acronicta aceris. Sadly, the link to the UK website where we originally identified it is no longer active.

Letter 3 – Sycamore Moth Caterpillar from UK


Strange Orange Caterpillar
Dear Bugman!
This little beastie was found at work in Thame in Oxfordshire. I was wondering what species it was so I could go back to my colleagues with a suitably impressive answer See what you think and if you get a chance, let me know. Kindest Regards
Tom Sherifi

Hi Tom,
While web searching to identify your Punk Rock Caterpillar, we found a great UK Caterpillar site that lead us to the Sycamore Moth, Acronicta aceris.


  • Bugman

    Bugman aka Daniel Marlos has been identifying bugs since 1999. is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

  • Piyushi Dhir

    Piyushi is a nature lover, blogger and traveler at heart. She lives in beautiful Canada with her family. Piyushi is an animal lover and loves to write about all creatures.

1 thought on “Sycamore Moth: All You Need to Know for a Fluttering Experience”

  1. Hi! I think I may have one of these in my bedroom. We brought in some branches from a downed sycamore and there is a chewing scratching noise coming from inside one of them. The only thing is I live in NJ! Could it be the same bug?


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