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One of a number of species belonging to the order Collembola. These insect-like creatures feed on living or decaying vegetation, and can be a nuisance in greenhouses. They can be controlled using insecticide.

Aphid-like insects of the family Adelgidae that are found exclusively on conifers. They feed on the sap of the host tree and cause cone-like growths, which can stunt or kill twigs and, in severe infestations, disfigure ornamental trees.

A green or brown leaf-eating bug that feeds on the sap of young growth, causing damage to flowers and leaves. It commonly affects outdoor ornamental plants, such as caryopteris, chrysanthemum, clematis, dahlia, forsythia, fuchsia, hydrangea

An organism that grows and feeds on another. Completely parasitic plants have no leaves or chlorophyll, relying entirely upon the host for nourishment. Semi-parasitic plants have leaves and are able to produce some of their own food.