Ohia Rust or Puccinia Rust

Photo: Brian Bushe, CTAHR

Photo: Brian Bushe, CTAHR

Problem

Red spots on the leaves of some ornamental trees; orange powdery pustules on the underside of leaves.

Hosts

Members of the Myrtaceae family which include Ohia, Rose Apple, Guava and Eucalyptus. Ohia Rust has decimated the rose apple trees on the Big Island.

Photo: Brian Bushe, CTAHR

Information

• Disease Index for the Rust Puccinia psidii on Ohia (Metrosideros polymorpha) in Hawai‘i [PD-38]
• Disease Index of the Rust Puccinia Psidii on Rose Apple in Hawaii [PD-37]
• Plant Doctor – Photograph Gallery – Ohia – Rust  (Photos are excellent here)
• Plant Doctor – Top Crops, Top Diseases

Kendal Lyon, Hawaii Island Master Gardeners