Cowpea aphids
Adult cowpea aphids are black, while nymphs are slate gray. Green aphids are probably pea aphids. (Marlin E. Rice)
This image appears in the following article:
Cowpea aphids
[1]
Source URL:
http://www.ipm.iastate.edu/ipm/icm//ipm/icm/node/401
Links:
[1] http://www.ipm.iastate.edu/ipm/icm/2006/4-24/aphids.html
