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Ohia Rust or Puccinia Rust

Ohia rust. Photo: Brian Bushe

Photo: Brian Bushe, CTAHR

Puccinia rust on ohia. Photo: B. Bushe

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.

Ohia rust. Photo: B Bushe

Photo: Brian Bushe, CTAHR

Information

Kendal Lyon, Hawaii Island Master Gardeners