This is a bug we were unable to identify for a long time. Its tiny size is almost beyond our camera's reach. Yet is kept on appearing on our roses. Thanks to Han Endt we now know it is Plagiognathus arbustorum. There is not much information about this species in our books or on the internet. We do know that it is sometimes considered to be a pest on strawberry. We also learned Plagiognathus arbustorum is a common species all over Europe, including the northern parts of Scandinavia.