Testing Plants for Myrtle Rust Resistance

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Below is a table of results from tests completed in association with The University of Sydney. The test was undertaken to determine the Myrtle Rust resistance of different plant and tree varieties. Testing was conducted by Dr. Karanjeet Sandhu, a Myrtle Rust Pathologist from the
Plant Breeding Institute, Faculty of Agriculture & Environment from The University of Sydney.

Competitor and common Callistemon varietifes were tested April 2013 and found to be susceptible to Myrtle Rust. This shows that our new and improved Callistemon varieties are tough and are either Moderately or Highly resistant to Myrtle Rust.

Myrtle Rust Result Interpretation

Note: This is a simplified version of the results table.

Common Name Botanical Name Notes Myrtle Rust Status
Callistemon sample 1   Fully developed pustules on leaves, low to high in frequency Susceptible
Callistemon sample 2   Fully developed pustules on leaves, low to high in frequency Susceptible
Callistemon sample 3   Fully developed pustules on leaves, low to high in frequency Susceptible
Callistemon sample 4   Fully developed pustules on leaves, low to high in frequency Susceptible
Callistemon sample 5   Small pustules without any chlorosis/necrosis and low in frequency Moderately Susceptible
Callistemon sample 6   Fully developed pustules on leaves, low to high in frequency Susceptible
Red Alert™ Callistemon viminalis Restricted pustule/dark gray surrounding/Necrosis Moderately resistant
Slim™ Callistemon viminalis No visible sign of infection Highly resistant
Better John™ Callistemon viminalis Restricted pustule/dark gray surrounding/Necrosis Moderately resistant
Green John™ Callistemon viminalis No visible sign of infection Highly resistant
Macarthur™ Callistemon viminalis Mild hypersensitivity/Dark flecks Resistant
Common form Callistemon viminalis Fully developed pustules on leaves, low to high in frequency Susceptible
Kings Park Special Callistemon viminalis Fully developed pustules on leaves, low to high in frequency Susceptible
Captain Cook Callistemon viminalis Fully developed pustules on leaves, low to high in frequency Susceptible
Little John Callistemon viminalis Fully developed pustules on leaves, low to high in frequency Susceptible


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