Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Beetles, bugs, ants, and other insects without obvious wings - Under 1/4 inch long > Oleander aphid
Jeff Hahn, University of Minnesota Extension
Description: Up to 1/8 inch long. Pear-shaped, bright yellow with black legs. They have long antennae and two cornicles ("tail pipes") on the rear of their abdomen, which are also black.
Where/When:Feeds on milkweeds throughout the spring and summer.
Significance:Rarely, if ever, damages milkweed.
More information on Oleander aphid