Welsh poppies are generally trouble free, but these capsid bugs have a particular taste for them. They eat through a feeding tube that they poke into the flowers at bud stage. Their saliva causes the tissue around the hole to toughen, discolour and die. Then, as the flower opens, the wound sites will often tear. Consequently, the flowers are marked with discoloured spots and little holes.
These bug aren’t a major pest or problem, and if possible (as always), it is best to tolerate them.