Disease resistant Rhododendron.
A customer of mine has two problem Rhododendron that always plagued with a variety leaf diseases. They are planted, watered and fertilized properly, receive the correct light, are in good soil and the PH is correct. Other Rhododendron in the same development look fine, and are not receiving fungicide treatments. I don't know what variety they are. I told her I could treat them every few weeks, but it would make more sense to replace them with a more disease resistant variety. Which Rhododendron, preferably white, are more disease resistant to the general leaf diseases? It is not important to know what the problems are at this point, I would ID them if I thought it were worth the trouble, these are just a problem variety. Oh it is Zone 5.