Puccinia psidii RS James & CA McMaster JULY 16 (b) (a) Lithomyrtus Lithomyrtus retusa new shoots of Fig. 1. and infecting a new host February 2015, wasobserved rust Myrtlefor theTasmania, first time in followedby the first report from 2015Maythein NT spreading Australiaacross and into damage except in guava plantations recognizedis widely as of a member the has been reported on over Since Classification Disease Name Common 27 median septum, dark yellowto brown,ellipsoidal to ovoid, 20 hyalineto light Urediniospores echinulate,a basalwith sometimes tonsure, are abundant“Uredia on the leaves,buds and fruits. Biology: cases cases it causes dieback or reduced fecundity. rangingstems from toresistant severe cases. In severe rapidit’s spread. The rust infects leaves, flowers and fruit, includingby clothing, cars and nurserystock, thus enabling over distances long or transported windby peopleby are produced largein numbers on host plants and dispersed The pathogen urediniospores byspread is primarilywhich andImpact: Range Host Africa and Indonesia. Japan, distribution (Florida), inChina, North America South and Caledonia.HawaiiAmerica, CentralNew Limited and distributedWidely SouthAmerica. inCentral and Australiaor Western Australia.Endemic to of parts South In Australia, the rust nothas yetbeen detected Southin Distribution: tonsures on urediniospores. found Australia,in including the presence/absence of Variablemorphology beenhas seen of the pandemic strain 6. 5. 4. 3. 2. 1. [email protected] KeyContact: References:
– – 43 26 Makinson PS, Machado Machado McTaggart Carnegie Carnegie Puccinia Puccinia psidii Puccinia × × 16 15 :
– –
24 22
et et et (2014) Myrtle Rust Myrtle(2014) Syzygium jambos Syzygiumjambos et al. (2015) Rust ( Rust (2015) al. et
al. al. al.
:
- μ μ
Glen M, Pereira OL, Silva AA, Alfenas AA, Silva OL, Pereira M,Glen
psidii
yellow, globose 18 yellow, (2015) (2015) ( ( m, wall0.7 m, wall1.5 m, : 2010 2015) Microsatellite analysis indicates that indicatesanalysis Microsatellite 2015) ;
K: Fungi P: BasidiomycotaC: Myrtle Rust, GuavaRust, Rust, MyrtleEucalyptusRust (g) on on (g) (c) inRust arange wide of Myrtaceoushosts :
) (a) urediniospores; urediniospores; (a) teliospores; (b)
Impact of the invasive rust invasivethe of Impact Uredo was
Eugenia Eugenia reinwardtiana Lithomyrtus first first detected in Australia rangelii – Puccinia
300 nativeAustralian – – what’s happening? Australian Plant Conservation 23(1):13ConservationPlant Australian happening? what’s 1.0 2.5
severely infected; severely infected; (e) on lesions , a taxon in the guava rust complex, newly recorded on recordednewly complex, rust guava the in taxona , μ μ
psidii m, pedicelm, 9 thick. Teliospores a withm Pathogen of Pathogenthe month – 23 Indonesia closelyrelatedwhich tois other rust outside species South America
) recorded in Indonesia poses a threat to forests and forestry in South in forestryand forests to threata posesIndonesia in ) recorded or on native retusa μ m diam. to m ovoid, Puccinia Puccinia
AC (2015)AC . In June 2015, the reported wasrust Sumatra, first from .
[image [image and e c by J.R. Liberato, NTDPIF©] –
psidii Puccinia 13 Pucciniomycetes species Myrtaceous
(d) psidii μ
Epitypification (myrtle rust) on nativeon rust) (myrtle in NSW NSW in m m long” (c) uredinia (c) uredinia and light
psidii José Liberato for guidance on the biology of this the of this use and the of images. fungus the on biology for Liberato guidance José Acknowledgments:
species complex. species complex. In theBrazil,not rust is toknown cause severe 2
. In Australia, the in Australia is mutating but not recombining. Australasian Plant Pathology 44(4):455PathologyPlant Australasian recombining.not but is mutating Australiain 5 Eugenia Eugenia reinwardtiana; in .
of
hosts 2010 Puccinia biology,or virulence specificityhost of the rust. increase ecologicalits introducingby impact variationsin newstrains management of the includestherust introduction limiting of use of fungicides. Another important principlethein use of resistant and varietiessome cases in the rotational spread, conducting research on the biology of the therust, support identifying assets and monitoring limitingat risk, the environmental management have been These formed. Numerous management plans targeting industryor Options Management host Backhousia citriodora young tree establishment. the From essential oilindustry expected theoccur greatestduring seedlingimpacts will and and industries. flowercut Inplantations, commercial is it the nursery, rust impacts timber, essential Commercially oil introduction rubescens and beenhas mortality observed in threatened species. Gradual crown loss and ultimatelytree 10%approximately of Australia’s flora; including some 140 include2250 over species of nativeMyrtaceae distribution wideof nativehosts owingto the recent introduction and the high numbers and The full impacts of this rust Australiaare within not known,
O: O: Myrtaceae . 3 1 . Microsatellite ,
- Pucciniales psidii 15 it has has it spread rapidly
Myrtaceae
- (f) (e) yellow urediniospores yellow urediniospores on
, Causal Agent of Guava of Causal Agent,
4 2
in natural ecosystems in Australia. Biological Invasions. 18(1):127Biological Invasions.in Australia. ecosystemsnatural in . Introductions mayallowtheto organism rust rust was .
Rhodomyrtus Rhodomyrtus psidioides in Australia.
(f) on on (f) F: F: analysis supports a single strain Pucciniaceae first first reported as
(Lemon is a susceptibleknown (Lemon Myrtle) : -
(g) East Asia. Australasian Plant Pathology 45(1):83PathologyPlant AustralasianAsia. East
Australasian Plant Pathology 39(5):463PathologyPlant Australasian
from from Rust. Tropical Plant Rust. –
natural stands of 2, Eugenia Eugenia reinwardtiana;
4 the first site of infection and July 2016 . Native hosts potentially
Indonesia Uredo
since thesince rusts
Pathology rangelii 6
4
representing . Rhodamnia
40:5 4 -
. In 466 but now – 12 (d) on on (d) - 462
- - 89 144