White flecks killing my boxwood
I have a four-foot tall boxwood (I think) bush that is about 10 years old and is planted next to the front porch. In the last two years white flecks have started invading the bush, starting in the back. The flecks are narrow and less than a tenth of an inch long. They cover the stems and the leaves and eventually kill them. Can you please help me identify if it is pest or disease, and recommend treatment? Picture is attached. Thank you!