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light gray worms on yellow loosestrife

light gray worms on yellow loosestrife
MidCoast, Maine, USA
August 19, 2007
Size: 1/2"
Skelatonized yellow loosestrife 3 years running. Half inch light gray worm. If you tap the plant they fall off. There are usually about 30 per plant.


Maybe sawfly larvae, were any coiled up under the leaves like this? Do you have any close-ups of just one, maybe showing the legs?
click and see the other images too.

Gray larvae
Thank you for your quick responses. Sorry about image quality. This year I'll do better. Although very similar in appearance and the fact that these guys curl up if they sense movement, they are very, very pale gray-from a foot out they look nearly white. That is why I call them ghost worms. Could the color difference be the result of what they are eating? I just did a search on sawfly larvae and they look just like those in the 8th row down, extreme right column. So, these are bad guys? What would you suggest to get rid of them?

gray larvae
I also have these almost white worms on my loosestrife. Hoe do you get rid of them?

I'd agree.
Monostegia abdominalis is known to feed on yellow loosestrife. Now, if we could just get them to eat PURPLE loosestrife! LOL!

Link for Monostegia abdominalis
See this note for another image of sawfly larvae on yellow loosestife and a link to a Monostegia abdominalis page.

Hi; I'm glad you asked this. We have exactly the same problem a little North of you in Quebec, now I know what it is. I sympathize, they really ruin the plants.

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