The Leaves On My Rhododendrons Turned Black And Fell Off. Also, The Buds Turned Brown And Dry Even Though We Have Had Rain And The

Question

soil is moist. The plants have been in this location for several years but have not had the issue before.

Answer 1

Your shrub probably has a fungal disease. You can cut out the dead parts and clean up any fallen leaves to help prevent it from recurring next year. Here is more:

https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/issues-with-rhododendrons.htm