Garden Pests and Diseases: Help my rhododendron are looking very brown, 1 by rox_male

rox_male wrote:
After a very difficult winter - freeze, thaws and heat- the rhododendron is looking awful. Many of the old leaves are brown. This might have happened awhile ago. I just noticed it last week when the weather got warm enough for me to go outside again and garden.

I haven't noticed increasing browning over the last few days, so I don't know if it is progressing or not.
The new growth looks healthy.

Any help is greatly appreciated.