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Tag Archives: wasp parasitising Large white pupae

W is for whites

28 Sunday Dec 2025

Posted by sconzani in insects

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British butterflies, butterfly, Large white, Large white butterfly, Large white larvae, Large white pupae, Marbled white, wasp parasitising Large white pupae

In this 2025 countdown, W is for white, as in white butterflies, specifically Large white and Marbled white butterflies. When I found my first Large white pupae this summer, I had no idea that those finds would also lead to an interesting if rather gory tale of parasitism, of both the Large white larvae and the pupae being prey to parasitic wasps and to those wasps also becoming the prey of another species of parasitic wasp. If you dare, check out my posts: Large whites and parasitism , part 1, 23 June, and Large whites and parasitism, part 2, 24 June.

On a more positive and, for me, absolutely delightful note, this was a fabulous year for Marbled white butterfly sightings, from my first of the year seen during my first mini break in Weymouth (The Marbled white and the Skylark, 21 June); to a day wandering around Leckhampton Hill near Cheltenham, bewitched by the sight of more Marbled white butterflies than I’d ever seen before (An exuberance of Marbled whites, 8 July); and, a couple of days later, seeing even more of these stunning butterflies during a wonderful day Roaming Rodborough Common (11 July). Simply magical!

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Large whites and parasitism, part 2

24 Tuesday Jun 2025

Posted by sconzani in insects

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British butterflies, butterfly, butterfly pupae, Large white butterfly, Large white pupae, parasitic wasp, Pteromalus puparum, wasp parasitising Large white pupae, White butterfly pupal parasitoid wasp

A week after my sighting of Large white butterfly larvae that had been parasitised by wasps (see yesterday’s blog post) I returned to the same location to see what might have changed during that time and was surprised to see six pupae, beautiful sculptural objects whose markings varied depending on how long it was since they had pupated. These can’t have been the parasitised larvae I don’t think, so there must have been a large number of larvae munching unnoticed in the grassy area below the signage they were on.

This time, as well as these pupae, a few parasitised larvae and a few caterpillars that looked normal but may still have had wasp larvae in their bodies, there was a new species of parasitic wasp in residence. They looked completely different to the wasp I’d seen the previous week and, rather than the larvae, these tiny wasps were all congregating around the Large white pupae.

As usual, I took a lot of photos and, when I got home, set about researching the possibilities. This time, my guide book offered no assistance but googling produced one probable answer. There exists a wasp that is actually named the White butterfly pupal parasitoid wasp, scientific name Pteromalus puparum, which seems the likely culprit, though this hasn’t yet been confirmed by any experts. I’m intending to revisit the site to see what’s happened while I’ve been away on my little holiday.

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About me

sconzani

sconzani

I'm a writer and photographer; researcher and blogger; birder and nature lover; countryside rambler and city strider; volunteer and biodiversity recorder.

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