Wish I could help you, but I don't have a clue. For something like this I would hope you have someone half way knowledgeable at a nearby extension service or perhaps a top end nursery.

Effective treatment and prevention are going to depend upon on positive ID of what you are dealing with. Could be viral, fungal or bacterial. A copper spray is probably a reasonable choice if you can't get a positive ID for some reason.

Now, having said that please make sure what you are dealing with is actually a problem. It is normal for blueberries to have branch tips turn dark and die. In year one green wood, usually unbranched forms. Then the tip turns dark and dies. It won't grow further. The next year branches form on the cane and the tips of these will also turn dark/black and die. It's just what blueberries do.

Well more than the tips were doing it. The first few were half of the branch and included new leaves and flowers/berries. Looked exactly like the pictures I found.

I found some fugus and disease prevention/treatment at Houston Garden Center I'm going to try. Its specified for fruit trees and vegetables. I'll spray that and take some pictures over the weekned. Whatever it is probably isn't going to be very active over the next 2-3 days. The Highs were in the mid 80's and just dropped into the lower 50's with lows in the upper 40's and pretty much no sun. Not much of anything should be growing.

Have you fertilized recently?

Al

Update. When I got home that day and looked there were no bad spots left and nothing major since. Actually the blueberries that are left are good size and starting to change color from light blue to dark blue. I picked/ate one the other day but it was still mostly green inside. Suprisingly didn't taste bad just more like a kiwi than a blueberry.

Al I think I did scatter about 1 spoon of fertilizer on top a few weeks before that. It was a very light scatter mostly near the outside of the container so it would just soak in slowly.