My best guess is a fugal leaf spot called Cercospora. Generally only an
aesthetic issue. Make sure to =remove fallen leaves to partly interrupt the
transmission cycle. There fungicides that can be used, but these only
effective if used as a preventative, and thus must be used every year, The
disease is gen worst when humidity is high in the spring, and when temps.
hover near 50 deg F during these humid times.

Good luck

--
Mike LaMana, MS
Heartwood Consulting Services, LLC
Toms River, NJ
www.HeartwoodConsulting.net



"Twobtold" wrote in message
...
Hi --
Seeking opinions on what to do, if anything, about brown spots
and discoloration on Rhododendron leaves. I found info about brown
spots with white in the middle but there is no white spots on these
leaves. Well-establishes plants in Zone 6, NJ

http://members.aol.com/twobtold/Garden/1Rhodo_leaf.jpg

Thanks for any insight.