Are aphids decomposers? (What do they eat?)

Aphids are small, soft-bodied insects that are typically green or black. They have long antennae and two short tubes (cornicles) protruding from their backs. Aphids feed on plant juices, sugars, and nectar by piercing plant tissues with their needle-like mouthparts and sucking out the fluid.

Aphids are not decomposers, but rather primary consumers as they feed on living plants and their sap. This does, however, not make them less important for the ecosystems as they are important prey for many other insects and larger animals.

Aphids are considered small insects, but they are actually very tiny! They are about 1/10 of an inch long and 1/16 of an inch wide. Their body has tiny hairs on it, which help them to stick to plants. Aphids also have a body that is light tan or cream colored, and they have flat, oval-shaped bodies.

Aphids are able to reproduce both sexually and asexually. In sexual reproduction, male aphids fertilize female aphids, which lay eggs that hatch into nymphs.

Nymphs mature into adults without going through a pupal stage like many other insects. In asexual reproduction, female aphids give birth to live nymphs that mature into adults without being fertilized by a male.

Aphid populations can increase rapidly because of this ability to reproduce asexually. But I’m sure you have experienced that if you have a garden or a balcony with plants…

Habitat of the Aphids

Aphids can be found all over the world, in both warm and cold climates. They are often found on plants such as roses, lilies, and dandelions. They mostly live outdoors on plants in a protected, damp environment, but may also find their way to your indoor plants if you are not careful!

Primary Diet of the Aphids

Aphids are herbivores. They mostly eat plant sap and juices. Aphids damage plants and cause disease by sucking plant juices. They also transmit plant viruses. Aphids have no teeth and use their mouthparts (labium and stylet) to pierce plants and suck sap.

Basically, aphids eat:

  • Sap
  • Leaf juices
  • Fruit juices
  • Nectar
  • Honeydew from other aphids (yep, a bit nasty!)

From various different parts of plants e.g. leaves, seeds, stems and fruits.

Feeding Habits and Digestion of the Aphids

Aphids pierce plants with their stylets and suck sap. Once they have eaten enough, they store the sap in their bodies. Aphids have chewing mouthparts, but they cannot chew their food.

Are Aphids Considered Decomposers?

Aphids are not considered decomposers because they only eat plants. Aphids cannot survive without a host plant to feed on. Their primary food source is plant sap or juices, which they get from piercing the plant

While aphids are not decomposers they can play an important role in the decomposition process.

Aphids have been shown to help break down organic matter in soil.

In studies of soil treated with aphids or with their droppings, levels of carbon, nitrogen, and phosphorus in the soil decreased over time. They may achieve this by breaking down the fresh plant material and subsequently releasing sugars that the decomposing bacteria and fungi can easily digest.

Are Aphids Carnivores, Herbivores or Omnivores?

Aphids are herbivores because they eat only plants. Aphids do not eat other animals.

Is an Aphid a Producer or a Consumer organism?

Aphids are primary consumers because they eat other living organisms. Aphids are herbivores, primary consumers, consumers and decomposers.

Where are Aphids in the Food Chain?

Aphids are herbivores. They eat plant juices that are produced by plants. Aphids, like most insects, are on the 2nd trophic level in the energy pyramid. However, some insects (like beetles) are also at the 3rd level if they eat other animals.

Are aphids an Autotrophic or a Heterotrophs?

Aphids are heterotrophs because they eat other living organisms. That is, animals like aphids cannot make their own energy, but need to eat other plant sap as their energy and carbon source.

What Animals Prey on Aphids?

Aphids have many predators. Birds, lizards, spiders, ladybugs and other beetles, lacewings, centipedes and ants will prey on aphids. Aphids have many predators because they reproduce rapidly and are easy to catch.


In this blog post I have taken you through some of the most interesting parts of the aphid diet as an insect that is often thought of as being a nuisance when found in our gardens!

Aphids are often thought of as pests, but they are actually fascinating animals!

Aphids live in many different stages of their existences and each life stage feeds on a different chemical in the plant.

The aphid life cycle starts with an egg on the leaf of the plant, which hatches, a nymph then hatches from that. The nymph then drops to the ground and starts to grow, and eventually it moults and becomes a winged adult aphid.

The adult fly feeds on the plant and eventually dies, and in the process secretes another egg. If the plant is disturbed the nymphs will moult, grow wings and dropped to the ground to start a new life stage cycle!

I hope you enjoyed reading this article as much as I enjoyed writing it! I always enjoy writing blog posts about other animal diets, so please do keep an eye out for new blog posts on my site!