How to disable (or enable) Google+ Comments in Blogger:While in the blogger dashboard for your blog,
1. Click on Google+ on the left sidebar
2. Uncheck "Use Google+ Comments on this blog"
Here's a screenshot to show how simple it is:
Consequences of disabling Google+ Comments- Commenting is open to any visitor, not only those with Google+ profiles, which also includes "spam comments."
- Comments and +1s while Google+ Comments were enabled will not be visible once disabled. However, enabling Google+ Comments makes them visible on the blog again, like turning off and on a light switch. Now you see them, now you don't.
I hope this is helpful, as it was difficult for me to find answers to such a simple thing.