This isn’t one for the squeamish. Not quite ‘Pod People’ – hawthorn would hardly make a comfy bed for them to mature in. It was a beautiful early morning, and I was admiring the roses when I caught site of this large sprawling web between my hawthorn bush and climbing roses. The light was filtering through the neighbour’s cherry tree so I could not quite make out what I was seeing at first. I thought, gosh there must be some big spider in there somewhere. But I could not see the wood for the trees, as they say.
And then I saw a wriggling, teeming mass of squirminess (I don’t even know if that is a word or not?). I was both revolted and fascinated at first. What an earth were they? Never mind that, I needed to get my camera. The first image shows it as how I first saw the web in the partial shade, which is kind of creepy, and I was creeped out at first to be sure. With the others images I upped the ISO a little to get more detail.
At first I though they were Ermine caterpillars/larvae, as they form masses of silken webs on vegetation. Yet they didn’t look like caterpillars of any moth. I discovered they are actually Social Pear Sawfly (Neurotoma saltuum) larvae, which not only feed on pear, but also apple and hawthorn and cotoneaster, amongst other trees and shrubs. The web must protect them from predation, for wherever they go the web is there with them.
They appear to be stripping the leaves off the bush within the webbing. Since these photos were taken a few days ago the mass has split into two opposing groups going in opposite directions on the bush. Despite their rampant appetite, the trees are not usually permanently harmed. The larvae will reach a length of 25mm (1in) when fully grown, and then they will go down into the soil to pupate. In the following spring the black coloured adult sawflies will emerge.
Click once to expand view, click again to get that little bit closer
July 2018, rear garden, Staffordshire, England. © Pete Hillman.
What a complicated form of communal living!
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Entirely yukky but fascinating! 😊🌿
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Thank you, Diana 🙂 I couldn’t agree with you more, lol! 🙂
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Ha! Those are so funny! The only bit I find revolting is all the little black blobs in the web without a body which I assume are dung!
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You got it in one, Liz!
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Your title is well chosen. A rather unsettling bunch. Glad they don’t seem to cause any permanent damage.
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Thank you, Belinda 🙂
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I had a load of sawfly on my twisted hazel last year chomping their way through the foliage. I keep checking but no sign of them this year thank goodness. At least they don’t come with that web – it is gross!
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And that web is so strong, too!
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I did push the like, great photos. However, I don’t like those things, or others like them. They have destroyed entire forest of fruit trees in the US.
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Thank you for pushing the like, Ted 🙂 Some larvae can cause devestation to trees and crops, which is obviously never a good thing.
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Eew. Interesting, but gives me the shivers.
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Thank you, Candice 🙂 Even I found that at first sight my stomach churned a little.
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As Candice says…..gives me the shivers. I don’t like spiders or creepy crawly things very much. Butterflies and moths are both beautiful and fascinating.
I know of 3-4 tales of seriously creepy things, (one of which happened to me), so I would need no cautions on un-identified little critters. I’m happier to view them from afar.
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Squirminess is a great word for that, LOL!
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Thank you 🙂
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Sawflies are pretty gross – but they feed the birds very well!
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I went to check on these sawflies the other day and they were all gone! Maybe the birds had got them, all they had all gone to ground to pupate.
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Yes, I read that they drop off to pupate. Did they leave any hawthorn leaves in their wake?
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They did very little damage, thankfully.
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Haha the Social Pear sawflies really are social, aren’t they. I’ve seen these webby things around my cotoneaster and compost bin, and the squimy little critters too. Fortunately I’m not put off by squirminess. Great images to have captured.
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Thank you, Jill 🙂 They hardly did any damage and was gone after a few days. I don’t know if the birds had them for protein or whether they all slid off the bush to the ground to pupate.
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How interesting!
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The light in the first shot is amazing! First glance I would have thought caterpillars for sure. Surprising that the tree is not usually permanently damaged ..
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Thank you, Julie. 🙂 I always like the way light filters through trees, so couldn’t resist putting that shot in. They all disappeared a couple of days later, and the hawthorn had little damage.
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How amazing!
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I was amazed it had survived after such a collison with the glass! But it was only stunned for a while.
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