Sick Rhododendron

[carolegif]

I have two rhododendrons in my garden. Both are in bud and one is fine, but the other us looking very sad! It's leaves are drooping downward and going very pale green, some of the leaves have holes in them, but no sign if any insects on them. It is situated between a wegelia and a japonica, both of which are fine.

Any ideas or suggestions on how to make it well again?

Thanks!

[Buenchico]

All of the main diseases that affect rhododendrons are listed here:
http://apps.rhs.org.uk/advicesearch/profile.aspx?PID=573
but I can't see anything that really matches what you've described.

Perhaps it's simply caught a chill? See 'Leaf droop' here:
http://apps.rhs.org.uk/advicesearch/profile.aspx?pid=529

[Chipchopper]

From your description, it could be 'Rhododendron (leafhopper' (Graphocephala fennahi)
They are small and hard to spot due to their green and red pencil-like stripes.
They can also stop the plant from flowering due to a fungal desease which they carry, which kills the flower buds.
A difficult bug to control, as they fly about from bush to bush.
Eggs are layed in the buds which turn grey-brown.
I would recommend removing any dead or infected buds and destroying them, you should be able to do this by twisting and pulling with your fingers.