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.
Foliage Curls, Puckers, Turns Yellow Due To Aphids. Aphids are about the size of a pinhead and have soft, pear-shaped bodies. They may be green, brown or pink. They tend to cluster on tender, new growth on zinnia stems and on the undersides of young leaves.