Photo by Drees.
Winged forms have a black head and thorax and hold their wings roof-like over the back of the body.
There are many aphid species and they can be identified by looking at specific structures such as the projections on the end of the abdomen called cornicles and other features. Wingless adults overwinter in protected areas such as in field debris and soil and feed on weed hosts. In the greenhouse, they can be active year-round. In spring winged females fly to suitable host plants and produce live young nymphs through a process called parthenogenesis . Nymphs develop through several instars before becoming mostly wingless adults in 4 to 10 days depending on temperature.