Sawfly larvae on Birch

09 Saturday Jul 2022

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British sawflies, larvae eating Birch leaves, Nematus septentrionalis, sawfly larvae, sawfly larvae on Birch

When I spotted these mini-beasties, they were doing a very good job of munching their way through about half the tasty young leaves of a Birch sapling. I knew they were sawfly larvae – that bottom-in-the-air pose is very characteristic of sawfly larvae – and, naturally enough, I assumed they were the Birch sawfly (Cimbex femoratus), but a quick image google showed I was wrong. It took a while to track them down but it seems these are the larvae of Nematus septentrionalis (formerly Craesus septentrionalis).

220709 Nematus septentrionalis

I was rather concerned for the health of the Birch as it is one of a relatively new plantation at the local country park but, when I revisited the site just a few days later, all but a couple of the larvae had disappeared. I don’t think they would have grown to pupation stage that quickly, so I assume a local bird or two had enjoyed them.

Cool cats

19 Thursday May 2022

Posted by sconzani in insects

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butterfly caterpillars, butterfly larvae, caterpillars, larvae, moth caterpillars, moth larvae, sawfly caterpillars, sawfly larvae

Butterflies, moths, sawflies – all have larvae that look like caterpillars, cats. It’s that time of year when I feel compelled to check any leaves with holes to try to find the hole-maker, and so I’m finding lots of cool cats. These are just a few of the recent leaf-munchers I’ve discovered, some I can identify, some I can’t but that’s not always important: Lackey, unknown, Mirificarma lentiginosella, unknown, unknown, Drinker, Orange-tip, and Copper underwing.

220519 caterpillars

The return of Zorro

14 Saturday May 2022

Posted by sconzani in insects, leaves, trees

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Aproceros leucopoda, Elm zigzag sawfly, sawfly larvae, sawfly on Wych elm, Wych elm

If you’ve been following along here for a while, you might remember last year’s ‘first for Wales’ find, the distinctive marks on leaves of Wych elm trees of the Elm zigzag sawfly (Aproceros leucopoda) (Zorro comes to Wales, October 2021). For the past couple of weeks I’ve been monitoring the trees where I first saw those marks and, yesterday, found them again, with the larvae that create them in situ, happily munching away on the elm leaves. In fact, following a good look around the area, I found larvae on six Wych elm trees (and there were other trees I couldn’t access), and then found a single larva on a Wych elm at Cosmeston, perhaps half a mile away. It will be interesting to see how quickly these creatures spread through the local landscape.

220514 elm zigzag sawfly larvae

Leafmines: Fenella nigrita

07 Monday Feb 2022

Posted by sconzani in insects, plants

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British leafmines, Creeping cinquefoil, Fenella nigrita, Fenella nigrita larval mines, leafmines on cinquefoil, sawfly larvae, sawfly leafmines

When reviewing my leafmine records yesterday and comparing them to those I’ve blogged, I realised there are several I’ve yet to cover here. Most are spring- and summer-time finds so I’ll post about them at the appropriate time but this is one I found in December – I didn’t cover it then as I was in the middle of my A-to-Z end-of-year countdown.

220207 Fenella nigrita (1)

These are the leafmines of the sawfly Fenella nigrita. Its larval mines can be found on Agrimony and on the various cinquefoils – I found these on Creeping cinquefoil (Potentilla reptans). Though the British Leafminers website reports that the mines are normally seen in summer and autumn, I found these on 3 December and the mines are occupied (I’ve added a pointer to one of the larvae in the photo below right). Presumably the mild weather meant a longer breeding season for these sawflies, as with many other creatures.

Pillars of the insect community

30 Thursday Sep 2021

Posted by sconzani in insects

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British insects, moth caterpillars, moth larvae, mystery caterpillars, mystery larvae, sawfly caterpillars, sawfly larvae

To showcase their diversity, in colour, size, shape, pattern, habits and hairiness, I’ve been gathering photos of these (cater)pillars of the insect community, the larvae of moths, sawflies, and some mysteries, which could be one of these … or something other. Here they are:

Moths: 5-spot burnet (Zygaena trifolii), Drinker (Euthrix potatoria), and the delightfully named Maiden’s blush (Cyclophora punctaria).

Sawflies: a possible Allantus species (its identity cannot be confirmed as it was on the wrong plant), and the fluffy looking Eriocampa ovata.

Mysteries: if you can ID any of these, please leave a comment below. Thanks!

Bizarre larvae

18 Saturday Sep 2021

Posted by sconzani in insects, leaves, trees

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British sawflies, holes in Alder leaves, Platycampus luridiventris, sawfly larvae, sawfly larvae on Alder

I don’t know about you but when I see a leaf with holes in it, I feel a compulsion to turn over that leaf to try to determine what caused those holes. And that’s how I discovered today’s rather bizarre-looking creature.

210918 Sawfly Platycampus luridiventris (2)

And once I realised that the holes it made were smaller than many of the other holes in the surrounding leaves, I looked for other leaves with similar sized holes. And so I found several more.

210918 Sawfly Platycampus luridiventris (1)

And then I looked at other Alder trees in the same park, and I found even more.

210918 Sawfly Platycampus luridiventris (3)

It took a bit of googling when I got home but I eventually found a name for my mystery creatures, and that identification has now been confirmed by a national expert. These are the larvae of a sawfly called Platycampus luridiventris, a rather non-descript fly when you consider the larva it develops from. You can see that adult fly and read the scientific information about this species on The Sawflies (Symphyta) of Britain and Ireland website.

210918 Sawfly Platycampus luridiventris (4)