There are multiple metric units to choose from! This tutorial goes through the process of choosing the best metric unit to use for measuring the mass of a given object.
The most common aphids on houseplants are the light green ones (pear aphids), but aphids can also be found colored pink, white, grey and black. Additionally, winged aphids can appear when colonies are established and fly to infect new plants. Juvenile aphids (nymphs) look like smaller versions of the adults.
Common aphid species found in Minnesota include the green peach aphid, potato aphid, cabbage aphid, melon aphid, and brown ambrosia aphid. The green peach aphid feeds on 100s of different plants including potato, pepper, cabbage, spinach, asparagus, aster, dahlia, iris, and verbena.