Holy fruit trees, Bugman!
My friend has several young fruit trees (sorry, I'm not sure exactly how old) - apple, pear, cherry, and plum. The leaves are being eaten. He believes it is by this bug shown in the photo. Can you give your opinion on the culprit and any advice on remediation?
We viewed your photos. This looks like a type of beetle but we could not make an accurate diagnosis based on the photo. There is not a major beetle defoliator of fruit trees this time of year. You can look at the link for the oriental beetle to see if this is what you may be dealing with. http://extension.umd.edu/hgic/grubs-lawns
Also, look under the leaves for possible caterpillars which can make holes n leaves.
The insect in the photo may be guilt by association and was not the insect causing the damage. It is too late to do anything about this. No control is necessary.
In general fruit trees are susceptible to several insect and disease issues and eventually require a spray schedule for control in the spring and throughout the growing season. A large number of problems may be cultural and environmental too. You will have to identify what you are dealing with. Take a look at care and common problems of stone and pome fruit for more information. http://extension.umd.edu/growit/fruit-profiles/getting-started-tree-fruits