Help ID pest causing damage

Bridgewater, NJ

This type of leaf damage has been rampant in my yard for the last 2 years. Is it tarnished bug damage ? Other? I would appreciate suggestions on how to treat whatever pest it is that's defoliating my garden.
Thanks in advance for your help.

Thumbnail by Dunedog2010
Lititz, PA(Zone 6b)

I'm assuming you're speaking not of the rhododendron leaves but the leaves of that other plant with the black spots on it. That is probably a fungal leaf spot.

Here is a link that might be useful to you:

http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/diseases/fungal-spots/leaf-spot-shade.aspx

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