Can anyone identify this bug for me please? Sorry for the quality of the photo but these things are tiny, barely 2mm long. There are lots of them living on carrot leaves in my veg plot. We've had them before and they seem to cause the leaves to go yellow and die back. I can't find any info on them on gardening sites.
Thank you for looking at this for me. None of them seem to move - there are quite a few on each carrot leaf and they just sit there. I photographed one a few days later and it appeared to have a hole in it as did quite a few others. I wasn't sure if it had been attacked by something but presumably the hole could have been caused by something getting out.
They seem to appear quite suddenly - I'd been watching the carrots for signs of pests as we've had these before. We seemed to go from clean leaves to lots of these pests in a very short time.