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

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

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

Of the leaf beetle family, flea beetles are small, jumping insects, which feed mainly on root vegetable crops and brassicas.

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

An insect of the order Hymenoptera. They're considered a pest in the summer when they feed on ripe fruit.

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.