I have always found these treehoppers on Nannyberry (Viburnum lentago), but assume they use a variety of shrubs. They are cryptically coloured and shaped, making them hard to find. Today I decided to look for the egg masses instead and this worked as I found several adults near the egg masses, and this one in the process of laying eggs. They usually deposit 4 to 6 or more white clusters that look like little white blobs on the stems. The covering hardens and forms a protective cover, although I noticed that some seemed to have been opened.