Invasion! - Aprostocetus

Moved

… Miles Zhang, 3 April, 2021 - 9:18pm

The gall is D. ignota, but th

The gall is D. ignota, but these should be Aprostocetus. They are the only gregarious parasitoids of Diplolepis galls in North America.

… Miles Zhang, 3 April, 2021 - 9:19pm

Moved

Moved from Unidentified Galls.

… Charley Eiseman, 21 August, 2009 - 8:53pm

Galls

These are called galls; they are caused by the plant reacting to the insect inside them. I've searched the internet and can find nothing that looks like your rose galls. If you keep some uncut ones in a jar the adults insects (wasps, or beetles, or flies) will emerge and these probably can be identified. In any case, your first resort should be your local cooperative extension office.

… Michael C. Thomas, 1 May, 2009 - 8:07pm

Great idea keeping them in a

Great idea keeping them in a jar to see what emerges. I will probably also stop by the county extension agent's office and see how to get rid of them -- tho the consensus seems to be that it is some kind of rose gall.
Thank you for stopping to investigate the pictures and leave your suggestions!

… Dawne Olson, 4 May, 2009 - 8:55am

Cynipids most likely

http://bugguide.net/node/view/84397

These were found on hansa roses.

… Natalie Hernandez, 1 May, 2009 - 9:17pm

Thanks

Hello,
Thank you for the response you left for my post -- I checked out the link and it does indeed look like the same type of gall. I have yet to find a way to completely get rid of it but at least I know what it is now.
THanks again!
Dawne

… Dawne Olson, 4 May, 2009 - 8:56am

Probably Diplolepis

As far as I know, all cynipid galls on rose are caused by the genus Diplolepis. Note that galls are not merely a reaction of the plant to the insects, but are specialized symbiotic structures that have evolved to allow the insects to feed on the plant tissue while causing minimal damage to the plant. Therefore, they are mainly a cosmetic problem, and I think it's unlikely that they would kill the plant. If you've observed a decline in blooms (unrelated to removing the galls), though, that's another story.

… Charley Eiseman, 2 May, 2009 - 10:21am

Thanks !

You're right that the roses don't seem to be adversly affected... they are still growing well and blooming as much as ever. They are unsightly but its good to know they aren't going to kill the plant. I would still like to get rid of them (permanently) somehow! Thank you very much, for your informative and helpful reply!
Dawne

… Dawne Olson, 4 May, 2009 - 8:59am