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Transcript
Uredo rangelii Uredo rangelii the cause of myrtle rust, was reported for the first time in Australia – during April 2010 – from Agonis flexuosa (willow myrtle), Callistemon viminalis (bottlebrush) and Syncarpia glomulifera (turpentine), in New South Wales. Since then the rust has been recorded in Queensland DNA sequence data places it in the Puccinia psidii complex but this taxon is morphologically distinct from P. psidii the cause of guava rust. This complex of diseases is native to South America and is also recorded in the United States of America (Florida and Hawaii) and Mexico. The pathway by which U. rangelii was introduced into Australia in unclear but the microscopic spores are easily carried by wind, on clothes, on plants through the nursery trade, on goods etc. The rust affects plants belonging to the Myrtaceae family; a family to which many Australian native species like the Callistemons and Eucalyptus belong. The rust affects young shoots and the growing tip of plants. The leaves become curled and distorted and new growth is killed. The fungus causes spots on stems and leaves of infected plants which develop into masses of bright yellow to orange powdery spores. Based on the current distribution and spread of the disease, the Myrtle Rust National Management Group (NMG) in December 2010 concluded that it was not technically feasible to eradicate it in Australia. A series of response plans which focus on community Photo credit: Dr. Louise Morin @CSIRO [link] education and reducing the impact of myrtle rust on the natural environment and commercial plantations has been developed. Quarantine restrictions have been put in place to prevent the sale of plants that have been infected with myrtle rust and the movement of infected plants interstate References: Carnegie, A. J.; Lidbetter, J. R.; Walker, J.; Horwood, M. A.; Tesoriero, L.; Glen, M.; Priest, M. J. 2010. Uredo rangelii, a taxon in the guava rust complex, newly recorded on Myrtaceae in Australia. Australasian Plant Pathology. 39(5). 2010. 463-466. Click here to view archives of previous weeks’ species