Google+ – Disable Posts from Public Community in Main Feed

There is nothing at the moment that will accomplish this properly (it may be possible through some script automation) as Google+ API is currently read only.

Note: The Google+ API currently provides read-only access to public data. All API calls require either an OAuth 2.0 token or an API key.

Maybe the reverse is possible if Blogger allows it. It sounds like something Google might be planning to do. See Use your Google+ profile with your Blogger blogs

You can get a json feed with Google+ API. Here is a sample request -

GET https://www.googleapis.com/plus/v1/people/100089984211197410017/activities/public?alt=json&fields=id%2Citems(kind%2Cobject(attachments%2Furl%2Ccontent%2CoriginalContent)%2Ctitle%2Curl)&key={YOUR_API_KEY}

Sample results -

{
 "id": "tag:google.com,2010:/plus/people/100089984211197410017/activities/public",
 "items": [
  {
   "kind": "plus#activity",
   "title": "Always have your stuff when you need it with @Dropbox. Sign up for free! http://db.tt/GzHFzuZ",
   "url": "https://plus.google.com/100089984211197410017/posts/BP9YtjFWTdJ"
  },
  {
   "kind": "plus#activity",
   "title": "500px for Android is here! The app doesnt have upload option. You can only view photos you or som...",
   "url": "https://plus.google.com/100089984211197410017/posts/BUfEM2wg3a2"
  },
  {
   "kind": "plus#activity",
   "title": "Reshared post from Mimi Round",
   "url": "https://plus.google.com/100089984211197410017/posts/NzSj1kBj7J8"
  },
  ...
 ]
}

You can find more details at Google+ API Documentation.