Too hot, too much water or not enough. Tell us more, where are you located ?

Too small a pot!

Some of those dark splotches look kinda weird. Sal is most likely right (as well as the pot being too small), but most symptoms caused by water show as tip burn first. Some of those leaves are dying from the middle.

But probably a watering issue.

Thanks, I will cut back on the watering ans see what happens, San Diego Coastal 10a.

sunburn?

and you need a much larger pot.

Could also be blueberry bacterial leaf scorch.

http://articles.extension.org/pages/29628/bacterial-leaf-scorch-of-blueberry

Doesn't look the same.

Thanks. I will be potting up this late winter. It is not getting full sun presently. When I pot up I will check the root ball. I will watch the water closely during the winter.

Blueberries must not go dry.

thanks.