Pests, Diseases & Plant Problems

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Control Plant Rust


August 1, 2022


Searles Gardening Team

What are Rust symptoms on plants?

Rusts are a form of fungal disease that can affect many different species of plant from large trees, to small annuals with often individual species of rust only affecting certain species of plants.

What does rust look like on plants?

Primarily, common rust will attack the older (or lower) foliage of plants such as Pelargoniums, Gerberas and some annuals and can be noticed by raised orange, or rusty coloured spores on the undersides of the leaves. In the case of some strappy foliage plants such as Dianella, it can take on the appearance of brown, linear staining.

How to control rust on plants

Removal of all the older, lower foliage is essential to allow for a strong air flow at the base of the plants. Reduce overcrowding plants in containers or garden to allow maximum sunlight to penetrate.  Water sparingly in humid conditions and water at soil level only to reduce wetting foliage.

Control rust on plants by spraying with Searles Mancozeb Plus.