Insects diurnal

Large Rose Sawfly

Arge pagana

A striking visitor to the summer garden, the Large Rose Sawfly is easily identified by its vibrant orange abdomen and glossy black wings. Watch your rose bushes closely to see these 'saw-bearing' insects in action.

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Quick Identification

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Size

Adults measure 8–10 mm (0.3–0.4 inches) in length with a wingspan of approximately 15–18 mm (0.6–0.7 inches).

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Colors

Glossy black head and thorax with a vibrant yellow to orange abdomen; wings are distinctly smoky or dark-tinted.

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Key Features

Shiny all-black thorax and head
Bright orange or yellow abdomen
Dark smoky-colored wings
Larvae are pale green with numerous small black spots

When You’ll See Them

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Activity pattern diurnal

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Peak hours 10 AM – 4 PM

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Season May–September

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Diet Larvae feed exclusively on the foliage of roses (Rosa species), while adults consume nectar and pollen from various wildflowers, particularly those in the carrot family like cow parsley.

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Habitat Suburban gardens, rose nurseries, and woodland edges where wild roses are present.

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Behavior

The Large Rose Sawfly is named for the female's specialized egg-laying organ, which functions like a tiny serrated saw. She uses this to slice into the soft green stems of rose bushes to deposit her eggs in neat rows. While the adults are often seen hovering around flowers or sunning themselves on leaves, they are relatively slow flyers compared to wasps or bees, making them easier to spot and track with a camera.

The larvae are highly social and are typically found feeding in groups on the edges of rose leaves. When disturbed, they exhibit a unique defensive posture, arching their bodies into an 'S' shape to deter predators. Despite their common name, they are not true flies or wasps, but belong to an ancient lineage of insects that lack the 'wasp waist' seen in their more famous cousins.

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Camera Tips

To capture high-quality footage of the Large Rose Sawfly, position your AI camera within 12 to 24 inches of a rose bush, specifically targeting the tender new growth or the undersides of the leaves. Because these insects are relatively small, a camera with a macro lens or a close-focus setting is ideal. Try to angle the camera so it is level with the rose stems; this increases your chances of filming the female's fascinating 'sawing' behavior as she deposits eggs inside the plant tissue.

Lighting is crucial for these shiny insects. Aim for a spot that receives dappled sunlight. Direct, harsh midday sun can create glare on their glossy black thoraxes, while too much shade may result in grainy footage. If you are using a trigger-based camera, set it to its most sensitive motion setting, as the movement of a single sawfly can be subtle. To increase the 'dwell time' of adults in front of your lens, consider placing the camera near nectar-rich white flowers like Hogweed or Elderflower planted adjacent to your roses.

For larval activity, look for rose leaves that show signs of 'skeletonization' or heavy munching along the edges. Placing your camera near these feeding sites will capture the gregarious larvae in action. Since they move slowly while feeding, this is a great opportunity to use time-lapse settings to watch them move across a single leaf over several hours. Peak activity for the first generation occurs in late spring, with a second wave often appearing in mid-to-late summer.

Similar Species

Species that look similar or are commonly confused with Large Rose Sawfly.

Rose Slug Sawfly

Look for an orange thorax and a black spot on the base of the hind legs, which the Large Rose Sawfly lacks.

Berberis Sawfly

Similar orange and black coloring, but it exclusively targets Berberis (barberry) plants rather than roses.

Frequently Asked Questions

Large Rose Sawfly adults are most active during the warmest parts of the day, typically between 10 AM and 4 PM, when they can be seen feeding on nectar or searching for egg-laying sites.

The best way to attract these insects is to plant a variety of rose species, especially wild or climbing roses, and provide nearby nectar sources like Cow Parsley, Angelica, or Hogweed for the adults to feed on.

The larvae eat rose leaves, often stripping them down to the midrib. Adults do not eat leaves; they feed on the pollen and nectar of umbelliferous plants and other wildflowers.

Yes, they are very common in suburban gardens across Europe and parts of Asia, wherever rose bushes are cultivated. They are often considered a minor pest by rose gardeners but are harmless to humans.

The Large Rose Sawfly (Arge pagana) has an entirely black thorax and smoky wings. The similar Rose Slug Sawfly (Arge ochropus) usually has some orange on its thorax and a distinct black spot on its hind legs.

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