I'm almost certain your pictures show fireblight, and on that third one it has gone well past the blossom into the new wood on this year's growth. Shown below is a tree in my yard that has a mild case of blossom blight like I was talking about earlier. This is on a Summer Champion cultivar, Note how that it got some of the blossoms but not all, and it doesn't go into the wood. You can see an apple on one blossom but blight on one nearby.
PS - I can't explain the weeds like you were talking about. Maybe that damage is something else.
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