Uredo rangelii, a taxon in the guava rust complex, newly recorded on Myrtaceae in Australia

2010 ◽  
Vol 39 (5) ◽  
pp. 463 ◽  
Author(s):  
A. J. Carnegie ◽  
J. R. Lidbetter ◽  
J. Walker ◽  
M. A. Horwood ◽  
L. Tesoriero ◽  
...  
Keyword(s):  
Guava Rust

Puccinia psidii. [Descriptions of Fungi and Bacteria].

1965 ◽  
Author(s):  
G. F. Laundon
Keyword(s):  
Puerto Rico ◽  
South America ◽  
Dominican Republic ◽  
Central America ◽  
Geographical Distribution ◽  
Psidium Guajava ◽  
Eucalyptus Citriodora ◽  
Puccinia Psidii ◽  
Guava Rust ◽  
Rain Splash

Abstract A description is provided for Puccinia psidii. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: On Pimenta officinalis and Psidium guajava, also on Callistemon speciosus, Eucalyptus citriodora, Eugenia jambos, E. malaccensis, E. uvalha, Marlierea edulis, Myrcia spp., Myrciaria jaboticaba and Pimenta acris. DISEASE: Guava rust. Attacks foliage, inflorescences and young succulent twigs of pimento and Eucalyptus, and foliage and fruit of guava, causing severe defoliation under certain conditions. GEOGRAPHICAL DISTRIBUTION: Central America and Caribbean (Cuba, Dominica, Dominican Republic, Jamaica, Puerto Rico, Trinidad); South America (Argentina, Brazil, Colombia, Ecuador, Paraguay, Uruguay, Venezuela). (CMI Map 181, Ed. 2, 1949 & Herb. IMI.) TRANSMISSION: Urediospores disseminated by rain-splash in Jamaica (41: 569).

Invasive Syzygium jambos trees in Puerto Rico: no refuge from guava rust

2017 ◽  
Vol 33 (3) ◽  
pp. 205-212 ◽  
Author(s):  
Erin Burman ◽  
James D. Ackerman ◽  
Raymond L. Tremblay
Keyword(s):  
Puerto Rico ◽  
Species Distribution Modelling ◽  
Negative Consequences ◽  
Tropical Regions ◽  
Mountainous Regions ◽  
Syzygium Jambos ◽  
Guava Rust ◽  
Invasive Tree ◽  
High Precipitation ◽  
Austropuccinia Psidii

Abstract:Biological invasions can have negative consequences for resident biota, particularly when disease-causing organisms are involved. Austropuccinia psidii, or guava rust, has rapidly spread through the tropics affecting both native and non-native Myrtaceae. In Puerto Rico, the rust has become common on Syzygium jambos, an invasive tree native to South-East Asia. What are the drivers of infection, and do refugia exist across a heterogeneous landscape? We address these questions using species distribution modelling and beta regressions. The realized and potential distribution of Syzygium jambos is extensive. The model produced an AUC of 0.88, with land-use categories and precipitation accounting for 61.1% of the variation. Predictability of S. jambos is highest in disturbed habitats, especially in mountainous regions with high precipitation. All 101 trees surveyed and measured across Puerto Rico showed signs of infection to varying extents. Infection severity was consistently associated with annual mean temperature in all top beta regression models, but was also commonly associated with tree size and precipitation variables. We found no safe sites for S. jambos. Many trees were extremely unhealthy and some were dead, suggesting that S. jambos may soon become extinct on the island or reduced to persistent stump sprouts. Native vegetation may benefit from the local demise of S. jambos. While the rust has not jumped to native Myrtaceae, vigilance is required, as host-shifts have occurred in other tropical regions.

scholarly journals Chemical control of guava rust (Puccinia psidii) in the Northern Region of Rio de Janeiro State, Brazil

2010 ◽  
Vol 40 (1) ◽  
pp. 48-54 ◽  
Author(s):  
M. V. V. Martins ◽  
S. F. Silveira ◽  
L. A. Maffia ◽  
J. M. A. Rocabado ◽  
V. Mussi-Dias
Keyword(s):  
Chemical Control ◽  
Rio De Janeiro ◽  
Northern Region ◽  
Puccinia Psidii ◽  
Guava Rust ◽  
Janeiro State

Epitypification of Puccinia psidii, Causal Agent of Guava Rust

2015 ◽  
Vol 40 (1) ◽  
pp. 5-12 ◽  
Author(s):  
Patrícia da S. Machado ◽  
Morag Glen ◽  
Olinto L. Pereira ◽  
Arthur A. Silva ◽  
Acelino C. Alfenas
Keyword(s):  
Causal Agent ◽  
Puccinia Psidii ◽  
Guava Rust

Taxonomic uncertainty and decision making for biosecurity: spatial models for myrtle/guava rust

2012 ◽  
Vol 42 (1) ◽  
pp. 43-51 ◽  
Author(s):  
J. Elith ◽  
J. Simpson ◽  
M. Hirsch ◽  
M. A. Burgman
Keyword(s):  
Decision Making ◽  
Spatial Models ◽  
Guava Rust ◽  
Taxonomic Uncertainty

scholarly journals Rusts on Ornamentals in Florida

EDIS ◽  
2009 ◽  
Vol 2009 (5) ◽  
Author(s):  
Philip F. Harmon ◽  
Carrie L. Harmon ◽  
Aaron J. Palmateer ◽  
Stephen H. Brown
Keyword(s):  
Plant Pathology ◽  
Fact Sheet ◽  
Rust Diseases ◽  
Guava Rust

PP-256, a 6-page illustrated fact sheet by Philip F. Harmon, Carrie L. Harmon, Aaron J. Palmateer, and Stephen H. Brown, presents information on four representative rust diseases of ornamentals, including gladiolus rust, daylily rust, frangipani rust, and guava rust. Includes references. Published by the UF Department of Plant Pathology, May 2009. PP256/PP172: Rusts on Ornamentals in Florida (ufl.edu)

scholarly journals A Recurrent Epiphytotic of Guava Rust on Rose Apple, Syzygium jambos, in Hawaii

Plant Disease ◽  
2009 ◽  
Vol 93 (4) ◽  
pp. 429-429 ◽  
Author(s):  
J. Y. Uchida ◽  
L. L. Loope
Keyword(s):  
Southeast Asia ◽  
Fire Hazard ◽  
Strain Differences ◽  
Psidium Guajava ◽  
Metrosideros Polymorpha ◽  
Melaleuca Quinquenervia ◽  
Mature Trees ◽  
Syzygium Jambos ◽  
Dead Trees ◽  
Guava Rust

A Neotropical rust of the Myrtaceae, Puccinia psidii Winter, was described from Psidium guajava L., or guava, in Brazil in 1884 (1). It was first discovered in Hawaii on potted Metrosideros polymorpha Gaud. on Oahu in April 2005 (2) with pathogenicity and identity established (3). It spread quickly, and by January 2006, severe outbreaks of this rust occurred statewide on new leaves of Syzygium jambos (L.) Alston, or rose apple. Rose apple, a native to South and Southeast Asia, was introduced to Hawaii in 1825 and is locally abundant to invasive from just above sea level to as high as 1,000 m in elevation in wet sites. Healthy, reddish green immature leaves on new twigs become deformed, yellow-red, and covered with masses of yellow urediniospores following infection. As the disease progresses, infected leaves are blackened and defoliate, with no functional leaves formed. Stem tips and branches are killed and the canopy becomes progressively smaller. Repeated mortality of juvenile leaves was observed to kill 8 to12 m tall trees in the Haiku area of Maui. Wind dispersal of urediniospores resulted in heavy infection of even small groups of S. jambos isolated by 1 km or more and billions of urediniospores covered the ground under diseased trees. On Hawaii, Maui, and Oahu, trees with many dead branches are becoming common with concerns about the fire hazard of these dead trees surrounded by dry grasses. At low humidity levels, or on more mature leaves characterized by soft expanded yellow-green tissue, fewer, mostly circular spots are formed that do not expand. S. jambos is an example of a highly vulnerable host in Hawaii and represents one of approximately 3,500 species of Myrtaceae outside the Neotropics growing in Australasia, Southeast Asia, the Pacific, and tropical Africa, which have evolved unexposed to P. psidii. Severely infected S. jambos plants have been the major source of spores in the environment, exposing many Myrtaceae hosts to P. psidii. The pathogenicity of P. psidii has been consistent among and within islands with S. jambos severely infected and M. polymorpha, Melaleuca quinquenervia, Rhodomyrtus tomentosa, Myrtus communis, and Eugenia species commonly infected. Other hosts such as S. cumini, S. malaccense, and Myriciaria cauliflora are also infected, although guava and Eucalyptus spp. are rarely infected. Strain differences within P. psidii are suspected (4). In the tropics, it is rare for mature trees to be killed by a foliar pathogen, but given the devastation of new growth, death of more S. jambos trees is likely. References: (1) T. A. Coutinho et al. Plant Dis. 82:819, 1998. (2) E. M. Killgore and R. A. Heu. New Pest Advisory No. 05-04. Hawaii Department of Agriculture, 2007. (3) J. Y. Uchida et al. Plant Dis. 90:524, 2006. (4) S. Zhong et al. Mol. Ecol. Res. 8:348. 2008.

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