Erin, thanks for the question.  

Blueberries do not like wet feet.  With our weather hot and dry and now too much rain, it can be hard to assess how much water to put down.  The damage is consistent with too much water but too little water can look the same.  Soggy soil can smother roots and cause root rot.  Do what you can drain water away from the plants.  For smaller transplants, roots systems can be inadequate to take up enough water even with wet soils when there are drying winds and heat.  

I hope this helps.