About the aphid
One particular bit of info about this species that you may not hear elsewhere is how it interacts with parasitoid wasps. In laboratory host range tests of parasitoids being considered as biological control agents against soybean aphid in the Heimpel Lab, adult wasps were often found dead after contacting M. asclepiadis. After two undergraduate research projects that I helped advise (by Michael Oxendine in 2010 and Mattea Allert in 2012), we can say that adult M. asclepiadis does indeed seem to cause premature death in at least two species of Lysiphlebus parasitoid wasp adults. The exact mechanism is still under investigation. Many aphids defend themselves against their attackers, but this is an extreme case.
As will be the case with all of these posts, the species info is a combination of personal observations, things I have retained over the years from reading papers and books, and information gleaned from easily accessible web sources such as Influential Points and Aphids on the World’s Plants. I think I will skip having formal citations for everything since this is just for fun. This entry is long since it is my first real post and covers an aphid I have more experience with. Others may be much shorter.
About the photos
As you can see, these are very colorful aphids and stand out quite nicely from the leaves they live on. This first photo is what they look like with a regular macro lens at 1:1 magnification.