An aphid is a small, soft-bodied insect that survives by sucking the sap from plants and consuming it.
Aphids come in all colors, although pale white or light green are the most common. They can also be black, or yellow.
In fact, there are more than 4,000 different aphid species in the world today. They are also sometimes called plant lice, greenflies, blackflies, and whiteflies.
When present in small numbers, aphids do little damage to plants. However, they can quickly multiply, and heavy infestations can do significant damage.
Note that aphids reproduce multiple times during the growing season, giving birth to live young.
In the fall, male and female aphids develop, mating and laying eggs that will overwinter, only to hatch a new colony in the spring.
They can cluster thickly, depriving garden plants of the sap needed to carry nutrients through tissues, causing wilting, poor fruiting, and even plant death.
Aphids also excrete honeydew, which can attract yellow jackets.