Aphids are tiny sucking insects from the insect family Aphididae. The group includes roughly 5,000 different species, with several hundred that may be a problem for agriculture and gardening. Adult aphids are pear-shaped, measuring less than 1/8 inch in length. 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.
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