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Also known as jumping plant lice, psyllids are small insects that feed on plants.

Minute plant-feeding insects within the super family Aphidoidea. Commonly known as greenfly, blackfly or plant lice.

Microscopic, unsegmented worms that resemble fine cotton threads. Many are parasitic and feed off plant roots.

The large group of heterotrophic, spore-bearing organisms characterised by their lack of chlorophyll, which requires them to feed on organic matter. Parasitic fungi rely upon living plants or animals to provide their nourishment, while saprophytic

Metallic element essential in the production of chlorophyll in plants. Magnesium deficiency can stunt development, but may be combated by an annual application of foliar feed.

An insect that looks like a wood louse, but which is coated in a pale, waxy substance. It feeds on plant sap, and is best controlled by systemic insecticide.

Slimy molluscs that feed by night on tender plants and some root crops. They can cause considerable destruction, and control takes many forms, from salting to the use of chemical pesticides.

A gastropod that has a coiled shell, and feeds on plants. It wreaks similar damage to slugs, and can be controlled in the same way too.

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.

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