Thank you for your question. Have you checked the soil pH? It needs to be acidic. Here is more information: https://extension.psu.edu/blueberry-establishment-getting-off-to-the-right-start Good luck!

Yes, I checked the soil and it is acidic.  Same soil as two blueberry bushes on either side in the row, but those bushes are fine.  

Thanks. So the following article has a photo of bushes that could be yours, along with the cause: https://www.canr.msu.edu/news/drought_symptoms_in_blueberries Drought stress is just one of the leaf problems discussed in this article: https://blogs.cornell.edu/berrytool/blueberries/leaves-are-unusually-colored-spotted-or-necrotic-browning/ If you cannot distinguish among these in your plant, I suggest you visit your county Extension office, where staff can examine them closely. Often, the undersides of the leaves, or use of a microscope are necessary to get an accurate diagnosis. Here is their webpage: https://extension.psu.edu/ Good luck!

Thank you for the link to county extension offices.  Since my problem is definitely not drought stress, I will take a sample to my extension office and see if they can diagnose the problem.  Thanks again, for the help with this problem.

Good luck! Maybe the problem is just too small for us 2000 miles away!