Plant Diseases: Rust

Plant disease: fungal rust

Photo Credit: Flickr, IITA Image Library

Rust is one of the most common fungal plant diseases. The rust fungi will cause unsightly, small, yellow spots on the surface of the leaves and a brown, orange or black powdery residue underneath. The disease is not deadly, but can cause leaves to fall off early and weaken the plant.

Unlike other fungi, rust tends to affect healthy plants, usually during late summer or early fall. The disease is spread by spores in the air. As a fungal disease, the rust will flourist in wet conditions.  Rust can affect trees, flowers, grasses and plants such as hollyhocks, fuchsias, roses, and chrysanthemums. The disease generally affects the leaves, but symptoms can also show up on the stems, flowers and fruit.


  • Prevention is the best cure for rust. Choose disease-resistant plants.
  • Remove affected leaves immediately.
  • Prune crowded plants to improve the air circulation.
  • Try to avoid over fertilizing the plant, as too much nitrogen will produce more leaves for the disease to affect.
  • Avoid overhead watering.
  • Neem oil, a natural fungicide and pesticide, can help control rust.
  • Chemical fungicides can also be used to treat the rust, but is often used as a last resort.

Other Plant Diseases:

About Connor Lowry

I love flowers! I enjoy writing about them as well as gardening. Mostly I love finding new and unique flower gardening ideas I encourage you to post regularly on this blog, and send in guest blogs or ideas for new blogs as well. New and exciting blogs are always welcome I intend to post a lot of interesting facts and fun stuff about flowers, as well as info on many varieties of flowers.
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2 Responses to Plant Diseases: Rust

  1. Pingback: Types of fungus and how to cure it | Fungal diseases in plants -

  2. Pingback: Plant Diseases: Rust | Grower Direct Fresh Cut ...

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