I am not positive maybe someone here knows, but those don't look like any aphids I have seen, but i know there are different kinds. Hope you get an answer.

ok so I think I was wrong, I found this pic online and thought it looked like your pic.

Here is a link that might be useful: viburnum pests

Aphids.

Dan

thanks!

hey, and I saw a ladybug on the viburnum this morning! I cut off the worst of the aphids into soapy water, but I'm hoping whatever aphids are left attract a nice big colony of ladybugs.