spots on Hew Bush
It's always difficult to provide an accurate diagnosis on the basis of a single picture but based on what I see it appears that your yew may be infested with the wooly adelgid which is common to hemlock trees in this area. The following link provides additional information on the diagnosis and treatment of wooly adelgid. http://ento.psu.edu/extension/factsheets/hemlock-woolly-adelgid
It would be best to take a sample of your shrub with the infestation in a plastic bag to your local Penn State extension office located at:
1015 Bridge Road, Suite H
Collegeville, PA 19426-1179
Office HoursMonday-Friday 8:30 a.m. - 4:30 p.m.
The local extension office will be able to provide a more definitive diagnosis.