Azaleas have been losing leaves and branches dying. Azaleas are very mature and have never had issues like this before.

Question

Leaves turn yellow and die and seems to be spreading to other plant.

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Answer 1

It does seem to have a blight. From my research it appears that blights and crop destruction is quite common in Texas.

Treatment will be simple. Apply WETTABLE SULFUR and DOLOMITIC LIME according to the package instructions. This will kill off the infection, as well as recondition the soil back to how it should be.

You will also want to treat the top with a fungicide. This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

This article will help you to care for the plants: https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azaleas-noteworthy-shrubs-for-any-garden.htm