Azalea spreading disease? Help!!!
I have 3 Autumn Sunset Encore Azaleas planted in one area and 6 Autumn Sunset Encore Azaleas planted in another area. All are on the same side of my house and receive about the same amount of sun. I had previously 7 Autumn Sunset Encore Azaleas but after the frost this past Spring, the leaves started turning brown and falling off. They eventually all dried up and died. I removed all of the previous azaleas except for 2 that looked like they were going to be fine, even though they did have some mild frost damage. My new azaleas are doing great except for the one that planted near the 2 old azaleas. Individual branches are just drying up. The leaves will start turning a golden brown then it just appears to dry up to the point that you can just snap off the branch. It does not affect the entire plant, just individual branches. The 2 older ones are starting to have more leaves drop too. This was only affecting the azaleas on the one side, but this morning I noticed one of the azaleas on the other side had a single branch turning the dreaded brown color. Now I am not sure if the frost is what actually killed the original azaleas or if they have some spreading disease. Please help so that my second go round with azaleas doesn't die too!!!
Front of plant.
Back of plant.
Close up of affected area