Help with blueberry branch drying up and turning brown

[maryann_just]

Please help, we have a few small blueberry bushes about 3 or 4 years old, on one bush, all the leaves on a main branch turned a pale green over a week or so and now have started drying out and turning brown.

The edges and tips of the leaves are very brown now with the interior of the leaves the lighter green, the leaves are somewhat crunchy now too.

The other branches are now starting to turn a pale green too so I'm getting worried. So far, the other plants are don't show the same problem.

Any ideas? PH tests okay with one of those little testers with the prongs, the hole is filled with peat moss, soil, and mulch.

I have a picture I can email but couldn't figure out how to post it on the site, sorry, new to this computer posting thing.

thanks for any advice you can share