Sawfly Larvae? #798417

Asked June 29, 2022, 1:14 AM EDT

For the second year in a row I have had this Larvae decimating my stonecrop. Stripping the stems completely bare and I'd love to know what it is. After asking in FB groups and much Googling the only thing we can find that looks like it are 2 types of European Sawfly Larvae Athalia Cornubiae and Athalia Rosae. I found them around our neighborhood on other's sedum too. They seem to prefer this specific sedum. I have 3 different variety and they will eat the other but barely. Can you help?

Multnomah County Oregon

Expert Response


What an interesting find and great research.

There are no established sedum insect pests listed in OSU's insect management book or from the University of California.

I suspect you've found saw fly larvae. To know for sure, you could put some plant material and larvae in a jar (with a breathable lid) and rear the insects to see what develops.

There's no pest alerts from the Oregon Department of agriculture and otherwise about this pest. Because it seems to prefer only specific sedums, it's not likely a pest of concern for the region.

If you're wanting to control the insect, you can hand pick the larvae or use insecticidal soap or need to spray the larvae directly.
Weston Miller Replied June 29, 2022, 3:58 PM EDT

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