Stopping git-svn pulling a particular branch

G'day

An svn developer created a branch from a subdirectory of the trunk
rather than by copying trunk itself.

I want to avoid pulling this branch into my git repo with git svn
fetch because the re-rooting pulls in too much history and content
that I don't want.

Is there any easy way to achieve this? I tried used the --ignore-paths
option, but this doesn't seem suited to the purpose.

I can delete the SVN branch if that will help, but past experience
suggests that it won't.

jon.