The simple answer is no (not yet), there is no facility for moderators to delete groups right now. I do automatically delete groups that Yahoo have taken down, but not groups that still exist.
It's going to take me a little while longer to get something up and running to handle the situation where a group needs to be deleted without me being involved (this is an "outside work" project and I've got other stuff that needs doing) but in the mean-time please email me the URL of both the new and old groups on the Finder and I will arrange the 'removal' of the group.
The URLs I am interested in are the ones specific to the group, with the number before the name like in this image:

If the URL doesn't have a number in it then it's the wrong one, and don't forget I need the URLs for both the old and new groups. Contact information at the bottom of every Recycling Group Finder page.