Shrub is an Amelanchier, looks generally healthy, but a lot of leaves have these little white grubs with brown ‘faces’ on their undersides. Not scale-looking, not chafer-looking, they squish & contain beige goo. No leaf damage where they are. I’ve drawn a blank with the googling, nearest I’ve got is weevil grubs. Anyone recognise them? I can try to take a better picture if that would help.