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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Ants, Bees, Wasps and Sawflies (Hymenoptera) » "Parasitica" - Parasitoid Wasps » Cynipoidea » Rose Gall Wasps (Diplolepididae) » Rose Gall Wasps (Diplolepis) » Mossy Rose Gall Wasp (Diplolepis rosae)
Photo#451892
[edit] Diplolepis rosae. - Diplolepis rosae
Copyright © 2010 David d'Entremont

[edit] Diplolepis rosae. - Diplolepis rosae
Hopkin's Loop @ Royal Botanical Gardens, Hamilton, Hamilton-Wentworth, Ontario, Canada
August 27, 2010
I found these rather strange structures sprouting out of a rose stem in the wild as I was walking along the trail. As with many strange growths, I felt pretty confident in assuming that it had its origins in some sort of gall-forming insect (probably a gall wasp).
[Edit] Thanks go to M. Zhang for confirming the species resoponsible for these strange growths, Diplolepis rosae. [Edit] COOL! Due to the proper identification of the gall wasp, which was previously not on the BugGuide taxonomy chart, the species D. rosae was added to BugGuide!

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[edit] Diplolepis rosae. - Diplolepis rosae [Edit] Diplolepis rosae - Diplolepis rosae [Edit] Diplolepis rosae - Diplolepis rosae
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Contributed by David d'Entremont on 6 September, 2010 - 11:27am
Last updated 14 September, 2010 - 8:31pm

Moved
Moved from Diplolepis.
Thanks for your input Miles! This certainly looks like multiflora rose to me. The one in my book was on a cultivated rose; I'm not sure what species, but it wasn't a native one, so I suppose that was D. rosae too.
… Charley Eiseman, 12 September, 2010 - 6:26pm login or register to post comments

 
Multiflora rose
I agree with all of the IDs for this plant as Multiflora Rose. In the center of the upper left quadrant of this photo, there is a curved thorn (slightly out of focal plane) on the green stem, a good character for Rosa multiflora. [Edit, a few hours later] I also noticed that there is a second thorn, farther down the stem and orange-colored, in the upper left corner of the photo.
… John Pearson, 12 September, 2010 - 7:35pm login or register to post comments

Moved
Moved from ID Request.
… John R. Maxwell, 7 September, 2010 - 11:08pm login or register to post comments

Not an expert, but some info
Diplolepis spinosa forms spiny galls on the stems of roses:


Based on the feathery nature of your gall, I wonder if it is something related to this:


Maybe Charley Eiseman can ID this for you!
… John Pearson, 6 September, 2010 - 12:05pm login or register to post comments

 
Diplolepis sp.
This looks to me like the same gall shown on p. 396 of my book. After consulting various sources and an email exchange with Ron Russo, I came to the conclusion that many books (not to mention websites) depicting Diplolepis rosae are likely misidentifying the galls of one or more other Diplolepis species. So I'm not sure which one this is.

Dr. J.D. Shorthouse lives in Ontario and specializes in Diplolepis rose galls, so he would be the logical person to ask. He didn't respond when I emailed him about my gall, but perhaps you would have better luck.
… Charley Eiseman, 7 September, 2010 - 10:32pm login or register to post comments

 
Diplolepis rosae
I am very interested in these galls, do you know what rose species it is on? The natural host should be the Dog Rose (Rosa canina).

I am Dr. Shorthouse's grad student:)
… Miles Zhang, 10 September, 2010 - 11:01pm login or register to post comments

 
rose species
I believe it was the Multiflora Rose, Rosa multiflora.

We were in the middle of a vegetation survey, and that was the only rose species in that area. However, I did not pay close attention to that specific individual - it is possible that it was a different species. Whatever the case, I don't believe it to be the Dog Rose.

If you wanted, I could contact my associates at the gardens to double-check on the identity. Let me know :)

ps: thanks for the id confirmation!
… David d'Entremont, 11 September, 2010 - 7:33am login or register to post comments

 
No R. multiflora is okay, I w
No R. multiflora is okay, I was just making sure it was not on a wild rose (R. blanda or R. acicularis).
… Miles Zhang, 11 September, 2010 - 8:17am login or register to post comments

 
Sounds good. Glad to help!
Sounds good. Glad to help!
… David d'Entremont, 11 September, 2010 - 9:46pm login or register to post comments

 
hmmm...
well, at least the genus seems to be holding fast! I will email Dr. Shorthouse to see what he thinks (if he has time).

Thanks!
… David d'Entremont, 10 September, 2010 - 4:36pm login or register to post comments

 
ah, right you are...
not the first time that google has let me down haha... thanks for pointing that out.
however, I still believe it to be a Diplolepis. I checked out the genus here at BugGuide and someone had some pictures of D. rosae which are spot on. In revision to my original question... does anyone know if this is indeed Diplolepis rosae ?
… David d'Entremont, 7 September, 2010 - 9:34am login or register to post comments

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