Sawfly lavae on willow

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CJohnsonOHBR
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Joined: Mon Jul 27, 2015 10:41 am

Sawfly lavae on willow

Post by CJohnsonOHBR » Fri Sep 04, 2015 1:25 pm

I was recently sent photographs of sawfly larvae on Salix.
My initial opinion was Lesser Willow Sawfly (Nematus pavidus), which is common here but under-recorded, but I now have some serious doubts.

Large Rose Sawfly (Arge pagana) has also been suggested, but I don’t that is correct either.

I am sure that most of you see a wider range of species than I do, so your opinion would be appreciated.

Many thanks

Christine
Outer Hebrides Biological Recording
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CJohnsonOHBR
Regular user
Posts: 30
Joined: Mon Jul 27, 2015 10:41 am

Re: Sawfly lavae on willow

Post by CJohnsonOHBR » Mon Sep 07, 2015 12:27 pm

This is a tough one, fortunately help was available from Jenni Stockan of the Hutton Institue.

"I would say they are Nematus ferruginea, which is common enough in the north and west. There are two similar species - N. melanocephalus and N. cadderensis. The latter doesn't have the distinct black spots but more of a black line. N. melanocephalus has more of the black spots lying within the yellow patches and is a more southern species."

Nematus ferruginea is usually found on Betula, but there are reports of Salix being used.
So now we know and it is another new species for the Outer Hebrides list.

Christine

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