This photo (http://www.cribmail.com/leaves.jpg) shows leaves of two
rhododendrons planted on the western foundation of my home outside Boston.
The plants have had these rust-colored spots since we bought the house six
years ago. The plants get strong afternoon sun and probably not much water
from the sprinkler system - is this heat damage or a disease? The plants
have flowered every year, but don't have many leaves.

Thanks in advance for any help.