Rhododendron damage

Doesn't look like cold damage, are those branches dying? It sort of reminds me of a fungal disease that is common with rhododendrons but can't say for certain because usually leaves turn brown and roll in. Cut off any dead branches and check to see if branches look reddish in color. Cold damage will usually leave brown spots on the leaves and most of the leaves look healthy.

I agree with Rkwright.

so just to cut off unhealthy branches´? Some leaves are rolled in on the ground, but they are not red, they are dried rolls, like cigars.

cut them off. During dry spells in winter keep them moist. Have seen few evergreen plants that dried out in winter because of lack of water.

Done!

Yeah, that's what leaves do with Botryosphaeria dieback or Phytophtora root rot but usually if they get root rot it's not long after planting them or while they are still in a pot. The stems are what get a reddish-brown color. I don't think there is a fungicide treatment for the dieback so cutting the branches as soon as you see a problem will keep it from spreading. Make sure to clean your pruners with a bleach solution or rubbing alcohol after cutting branches you think might have a fungus infection. I have forgotten to do that before and spread anthracnose to a dogwood!

What a disasterous message you have for me, Rkwright. Do you thnk it will be better to replant it, as well?