Aphids are soft-bodied insects that feed on plant juices using piercing-sucking mouthparts. There are many species of aphids and they may be white, yellow, green or black. They may be specific to a single plant or feed on many.

Plants Affected

  • Herbaceous plants, rose, maple, mayday, spruce, elm, and poplar are common host plants.
  • Almost any plant may be affected, including grasses.


The first sign of aphids is the presence of sticky spots (honeydew) on leaves, or a black appearance (sooty mould) on the bark. Heavy feeding causes leaf deformation and curling, followed by leaf death.


Cultural or Non-chemical Controls:
Can be controlled by knocking them off affected plants with a forceful stream of water when first noticed.

Chemical Controls:
Heavy infestations may require an application of insecticidal soap.

Close up of an Aphid
Juvenile and Mature Aphid
Aphid Infestation
Multiple Generations of Aphids
Spruce Tree Aphid Infestation
Wooly Elm Aphid Infection