Plumbago problems

OCATE, NM(Zone 5a)

Can anyone identify what's happening with this plumbago? The white rough spots on the undersides of the leaves do not appear to be scale. Is this the normal exudate from the chalk glands? If so, why the brown spots? Any ideas appreciated!

Thumbnail by wyldonion
Burien, WA(Zone 7b)

Looks like spider mite damage.
For treatments and comparison photos.
http://pchydro.hubpages.com/hub/How-to-Get-Rid-of-Spider-Mites

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