Pucciniales

Pucciniales

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Rust fungi are characterised by their orange-brown pustules which are often surrounded by a yellow ring (Depending on particular rust) that appear primarily on the leaves of a plant. They can range in severity from infections that can wipe out a crop to purely aesthetic damage. There are over 4500 different species of rust fungi of which 200 are native to the UK. They attack a very wide range of hosts from food crops to ornamentals.
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Identification

Rust fungi are characterised by their orange-brown pustules which are often surrounded by a yellow ring (dependent on specific rust) that appear primarily on the leaves of a plant. They can also, however, appear on the stems and other plant organs in severe infections. Pustules on leaves can be on the top or underside of the leaf depending on the species of rust

Growth factors

Overly damp, or dry conditions. Poor air circulation.

Symptoms

Orange-brown pustules on leaves, shoots or fruits. Pustules can be on the top or underside of leaves.

Biological treatment

There are no biological treatments for rust fungi

Chemical treatment

There are some copper fungicides that can be used to treat rust but these are quickly being made illegal and so you will need to check what is available.

Lifecycle

The rust fungi produce 4 different types of spores making it one of the most complicated life cycles of fungi. They often alternate between different host plants for different stages of their life cycle producing 1 or 2 types of spore on one species, then the remaining spore types on another species.

Prevention

General plant hygiene e.g, clearing dead leaves, removing and burning infected material etc. Having good drainage in the soil. Good airflow through and around plants.

Affected plants

Thousands of different host species.
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Knowledge and advice

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