White prunicola or white peach scale on twigs of host. Males cover the twigs and give the plant a ‘snowy appearnce’.
Close examination of an infestation (picture on the left) would reveal males (elongate and yellow), rounded and yellow, and dead male (dead from pesticide application; elongate and tannish brown). Picture on left is a close-up of the scale cover lifted off of a female white peach or white prunicola scale.
Picture on left above is of a female laying eggs with the cover still in place. Picture on right is same female but the scale covering (the ‘test’) removed. All photos were taken by Nancy Gregory, plant diagnostician and Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware
Picture on left shows banding on fir caused by Cryptomeria scale (photo by Brian Kunkel) and the picture on the right is a close-up of the infestation the undersides of the leaves (photo provided by: Lorraine Graney, Bartlett Tree Experts, bugwood.org).