leaf troubles on Buddleia

Hello Folks:
In the early spring when I was pruning back my Buddleia davidii 'Black
Knight', I noticed that the older leaves were quite ravaged by something I
assumed to be a pest.  There were large holes all through the leaves, and a
very dark sticky sap was at the edge of some of these holes.  I wasn't sure
if the sap was from an insect or the plant itself.  I didn't see any visible
insects or frass, and I asked an entomologist at UC Davis if the damage
brought any pests immediately to mind.  It did not, BUT he works mostly with
crop plants.  So, I've perused the UC IPM site and found nothing
particularly helpful, and the pages on both physiological and fungal
shothole didn't quite seem to match the look of things on my plant, i.e.
there were not reddish brown spots on the newest leaves, and no lesions I
can find on the stems.  I took off all the damaged leaves at pruning time,
but there is quite a bit of foliage damage tonight, and I am wondering if
anyone out there has had butterfly bush troubles of the same kind.  I have
attached a link to photos on Flicker of the front and back of a leaf.  I
apologize for the quality, as I have very unsteady hands and close-ups are
tricky for me.  It gives you the idea, though.  It may be significant that
most of the damage seems to be along veins, but I am not entirely sure.
Thanks in advance!
Karrie Reid
Folsom Foothill Gardener
Zone 9

http://www.flickr.com/photos/26571762@N02/
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