Marmalade hoverfly (Episyrphus balteatus)

The Marmalade Hoverfly: Britain’s Tiny Migrant Pollinator

There are few insects in Britain more familiar — yet more overlooked — than the marmalade hoverfly. Almost everyone has seen one hovering above a flower border, darting through a meadow, or basking in warm sunshine on a garden leaf. 

Many people mistake it for a small wasp or bee, but this harmless little insect is neither. It is a fly — and one of the most important pollinators in the British countryside.

The marmalade hoverfly, Episyrphus balteatus, is among the commonest hoverflies in the UK and can be found almost everywhere: city parks, wildflower meadows, coastal dunes, woodland rides, hedgerows, allotments and gardens. 

Despite its small size, it plays a huge ecological role. Adults pollinate flowers, while larvae consume astonishing numbers of aphids, making the species invaluable to both wildlife and agriculture.

This remarkable insect is also one of Britain’s great insect migrants. 

Every year, millions arrive from continental Europe, crossing the English Channel in vast invisible rivers high above our heads. Some years bring extraordinary influxes, with clouds of hoverflies appearing along southern coasts and spreading inland across the country.

For wildlife gardeners and nature lovers alike, the marmalade hoverfly is a species worth celebrating.

What Is a Marmalade Hoverfly?

The marmalade hoverfly belongs to the hoverfly family, Syrphidae, a group containing more than 280 species in Britain. 

Hoverflies are true flies rather than bees or wasps, although many species have evolved striking black-and-yellow patterns that mimic stinging insects.

The marmalade hoverfly is perhaps the best-known of them all. It is small, usually around 9–12 mm long, with an orange abdomen marked by neat black bands of varying thickness. These markings resemble the dark strips in thick-cut marmalade, which gives the species its wonderfully British common name.

At first glance it can easily be mistaken for a wasp. This resemblance is no accident. 

The pattern acts as a defence mechanism known as Batesian mimicry, where a harmless species imitates a dangerous one in order to deter predators. 

Birds that avoid wasps may also avoid marmalade hoverflies, even though the flies cannot sting.

Unlike bees and wasps, hoverflies possess only one pair of wings. They also have very large compound eyes and short antennae. Once you learn to recognise these features, distinguishing them becomes much easier.

Masters of Hovering Flight

Hoverflies are named for their astonishing flying abilities. The marmalade hoverfly can remain suspended almost motionless in mid-air before suddenly darting away at high speed. 

Watching one patrol a flower patch on a warm summer day is like watching a miniature helicopter.

This precision flight is possible because hoverflies have highly specialised muscles and superb visual systems. 

Their compound eyes detect movement exceptionally well, helping them avoid predators, locate flowers, and chase rivals.

Male marmalade hoverflies are often territorial. They hover in sunny clearings or over patches of flowers, defending small aerial territories from other males. If another hoverfly enters the area, the resident male may launch into a rapid chase before returning to the same hovering position moments later.

These aerial displays are not just aggressive behaviour; they are part of courtship. Females may choose males capable of maintaining the most stable and controlled hovering positions.

A Pollinator Hidden in Plain Sight

Bees receive most of the attention when pollination is discussed, but hoverflies are among Britain’s most important pollinating insects. In some habitats they rival or even exceed bees in flower visitation.

The marmalade hoverfly feeds primarily on nectar and pollen. Adults are attracted to open, shallow flowers where their short mouthparts can easily access food. In Britain they are especially fond of plants such as cow parsley, hogweed, ragwort, tansy, oxeye daisy, yarrow and many garden flowers.

Because they visit such a wide variety of plants, marmalade hoverflies are generalist pollinators. They help fertilise wildflowers as well as crops and garden plants. Their role becomes particularly important later in the year when some bee populations decline but hoverflies remain abundant.

Recent research has highlighted the enormous economic value of hoverflies worldwide. They contribute to food production by pollinating fruit, vegetables and oilseed crops, while also supporting the reproduction of countless wild plants.

In gardens, they are among the most beneficial insects a person can encourage.

The Secret Life of the Larvae

While the adults live on nectar and pollen, the larvae lead very different lives.

Marmalade hoverfly larvae are predators, specialising in aphids. Tiny green or brown maggot-like larvae creep among aphid colonies on leaves and stems, seizing prey with hooked mouthparts. A single larva can consume hundreds of aphids during its development.

This appetite makes hoverflies extraordinarily useful natural pest controllers. Gardeners and farmers benefit enormously from their presence, especially in crops vulnerable to aphid outbreaks.

Unlike ladybirds, hoverfly larvae often go unnoticed because they are well camouflaged and lack the familiar appearance of “cute” insects. Yet they are among the most effective aphid predators in Britain.

Females carefully select egg-laying sites near aphid colonies so the larvae hatch beside an immediate food source. The tiny white eggs are usually laid singly on leaves and stems.

Within days the larvae emerge and begin feeding.

A Life Cycle Built for Speed

The marmalade hoverfly has a relatively rapid life cycle. In warm weather it can progress from egg to adult in only a few weeks.

The stages are:

• Egg

• Larva

• Pupa

• Adult

After feeding extensively on aphids, the larva pupates, transforming inside a teardrop-shaped casing attached to vegetation. Eventually an adult hoverfly emerges, pumps fluid into its wings, and flies away to feed and breed.

Several generations may occur in a single year, especially during warm summers with abundant aphids. Population sizes can therefore increase dramatically under favourable conditions.

This ability to reproduce rapidly helps explain why some summers seem full of hoverflies while other years appear quieter.

Britain’s Great Insect Migration

One of the most extraordinary things about the marmalade hoverfly is that many British individuals are migrants.

Each year huge numbers travel northwards from southern Europe into Britain during spring and summer. These migrations often occur high in the sky and pass completely unnoticed by people on the ground.

Scientists now recognise hoverflies as some of the world’s most important migratory insects. Radar studies have shown that millions cross the English Channel annually, transported by favourable winds.

During migration years, coastal observers sometimes witness spectacular arrivals. Swarms may appear suddenly along cliffs, dunes and headlands, settling on flowers in huge numbers. 

Reports of these events occasionally alarm people who mistake the insects for swarming wasps or bees.

The migrants breed in Britain during summer, taking advantage of booming aphid populations in farmland and gardens. Later generations may migrate south again in autumn.

This movement transports not only insects but also ecological benefits. Migrating hoverflies pollinate plants across vast distances and help suppress aphids in agricultural landscapes.

Where Can You Find Marmalade Hoverflies?

Almost anywhere. The marmalade hoverfly is widespread across England, Scotland, Wales and Ireland. It thrives in a remarkable range of habitats, including:

• Gardens

• Wildflower meadows

• Woodland edges

• Hedgerows

• Parks

• Allotments

• Coastal grasslands

• Farmland

• Urban spaces

It is especially common in sunny areas rich in flowers.

Unlike many insects with brief flight seasons, marmalade hoverflies may be seen throughout the year in Britain, even during mild winter weather. Numbers peak during summer and early autumn.

If you want to find them, look closely at flowering plants on warm, calm days. Hogweed, cow parsley and oxeye daisies are often excellent places to search.

How to Identify One

For beginners, hoverfly identification can feel intimidating because many species resemble one another. Fortunately, the marmalade hoverfly has several distinctive features.

Look for:

• A small orange-and-black hoverfly

• Thin and thick black abdominal bands

• Large fly-like eyes

• Short antennae

• Hovering flight behaviour

• A tendency to bask on leaves and flowers

The species is highly variable, however. Some individuals appear darker than others, and females differ slightly from males.

A useful trick is to observe the wings. Hoverflies possess only one pair, whereas bees and wasps have two pairs.

Another clue is behaviour. Marmalade hoverflies hover effortlessly in place far more often than bees do.

Why Hoverflies Matter

Hoverflies are among the unsung heroes of British ecosystems.

While bees dominate public awareness campaigns, hoverflies provide many of the same ecological services. Some studies suggest hoverflies may be second only to bees as pollinators in many temperate ecosystems.

The marmalade hoverfly is particularly valuable because it combines pollination with biological pest control. Adults transfer pollen between flowers, while larvae consume aphids that damage crops and garden plants.

This dual role makes them hugely important in sustainable agriculture. Encouraging hoverflies can reduce reliance on chemical pesticides while improving pollination.

Their presence also supports wider food webs. Birds, spiders and predatory insects all feed on hoverflies at various life stages.

In many ways, they are tiny connectors holding ecosystems together.

Threats Facing Hoverflies

Although the marmalade hoverfly remains common, hoverflies as a group face growing pressures.

The biggest threats include:

Habitat Loss

Wildflower meadows, hedgerows and unmanaged field margins have declined dramatically in Britain over the past century. These habitats provide crucial nectar sources and breeding sites.

Pesticides

Insecticides reduce both adult hoverflies and their prey populations. Herbicides also remove flowering plants needed for nectar and pollen.

Climate Change

Changing weather patterns may disrupt migration timing and flowering seasons. Extreme droughts or heavy rainfall can also affect larval survival.

Gardening Practices

Highly manicured gardens with few flowers and extensive paving offer little for pollinators.

Despite these pressures, the marmalade hoverfly has adapted well to urban areas and gardens, which may help explain its continuing abundance.

Creating a Hoverfly-Friendly Garden

Anyone can help marmalade hoverflies by making simple changes in their garden or local green space.

The key is to provide flowers, shelter and aphids.

That last point may sound strange, but hoverfly larvae need aphids to survive. A completely sterile garden with no insect pests also supports few predators.

To attract hoverflies grow Nectar-Rich Flowers:

• Oxeye daisy

• Yarrow

• Marjoram

• Wild carrot

• Cow parsley

• Ragwort

• Tansy

• Verbena

• Calendula

Umbellifers such as fennel and dill are particularly attractive.

Avoid Pesticides

Chemical sprays kill beneficial insects alongside pests.

Allow Wild Corners

Long grass, nettles and untidy edges create shelter and breeding opportunities.

Plant for the Whole Season

Provide flowers from spring through autumn to support multiple generations.

Create Sunlit Spaces

Hoverflies love warm sunny patches sheltered from strong winds.

Even small urban gardens can become important feeding stations.

Fascinating Facts About Marmalade Hoverflies

It is one of Britain’s commonest hoverflies.

Adults may appear in every month of the year. 

Larvae can consume hundreds of aphids before pupating.

Massive migrations sometimes bring millions into Britain from continental Europe.

They cannot sting or bite humans.

Their wasp-like appearance is a defensive imitation called Batesian mimicry.

They are capable of remarkably precise hovering flight.

Some individuals overwinter in Britain during mild conditions.

Hoverflies are among the world’s most important insect pollinators.

Learning to Appreciate the Small Things

The marmalade hoverfly is easy to dismiss because it is common. Yet common species often perform the greatest ecological work.

Without hoverflies, British landscapes would be poorer in flowers, less productive agriculturally, and more dependent on chemical pest control. Gardens would buzz less, crops would suffer more aphid damage, and countless wild plants would struggle to reproduce.

Perhaps most importantly, hoverflies remind us that nature’s wonders are not confined to rare species in remote places. Extraordinary lives unfold all around us every day — on roadside daisies, garden marjoram, or patches of flowering ivy buzzing in autumn sunlight.

The next time you see a tiny orange-and-black insect hanging motionless in the air, take a closer look. Beneath those delicate wings is a long-distance migrant, an expert pollinator, a pest controller and one of Britain’s most successful insects.

Not bad for a fly.

Photo: Andhoj