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.
Suzanne Wold-Burkness and Jeff Hahn. Aphids are one of the most common insects found on plants. There are over 300 species of aphids found in Minnesota; they can be common in home gardens on vegetables, annuals and perennials.