Are those really slugs
on the leaves? No. Caterpillars?
No. Pear sawflies, also known as pear
slugs or cherry
sawflies, are out and feeding in the North Willamette
Valley.
The are the larvae of small wasps. They
have been spotted on
cherry but have other common hosts including pears
and plums.
Look for them on the lower leaves of host plants. I've put
together
a new pear sawfly page with more information, links, and
images.
Robin
http://oregonstate.edu/dept/nurspest/pear_sawfly.html
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