This is the time of year to see these gorgeously coloured little weevils. They don't seem to be particular about which plants they hang out on, although they are said to prefer willow, birch and poplar. This one (and several others) was on a red-osier dogwood, and I've seen them in great numbers on hazel shrubs (Corylus). This is a European species that was accidentally introduced (how often have we heard that about so many species!).