Asclepias syriaca ?
I don't understand how this species can be considered a pest? I have a gravelly, weedy spot w/a few A. syriaca plants growing in it. They grow big beautiful leaves, equally beautiful flowers, LOTS of seed pods but no seeds...WHY? because the larvae of beetles (not sure what species)eat them before they ever leave the pod. How do these things even survive much less become pests?!