In vitroculture ofPuccinia melanocephalaSyd., causal agent of sugar cane rust disease: (Short communication)

1985 ◽  
Vol 21 (5) ◽  
pp. 415-418
Author(s):  
G. Meilán ◽  
Rita María Ojeda
Keyword(s):  
Sugar Cane ◽  
Short Communication ◽  
Causal Agent ◽  
Rust Disease

Association of a small coryneform bacterium with the ratoon stunting disease of sugar-cane

1973 ◽  
Vol 24 (6) ◽  
pp. 869 ◽  
Author(s):  
DS Teakle ◽  
PM Smith ◽  
DRL Steindl
Keyword(s):  
Cell Wall ◽  
Electron Microscope ◽  
Sugar Cane ◽  
Cytoplasmic Membrane ◽  
Causal Agent ◽  
Free Sugar ◽  
Coryneform Bacterium ◽  
Ratoon Stunting Disease ◽  
Negative Stain ◽  
Thin Cell Wall

When fibrovascular sap extracts of sugar-cane plants affected by the ratoon stunting disease (RSD) were centrifuged and the resuspended pellets negatively stained and examined in an electron microscope, cells of a small bacterium were always observed. The bacterium could be distinguished readily from other bacteria present by its small size (usually 1.0–2.5 µm long by 0.15–0.32 µm wide), the coryneform (club-shaped) morphology of some cells, and its permeability to negative stain revealing a thin cell wall surrounding a cytoplasmic membrane and coiled mesosomes. Since the small bacterium was never observed in fibrovascular extracts of RSD-free sugar-cane plants, it is a possible causal agent of RSD.

scholarly journals Occurrence of rust disease caused by Puccinia oxalidis on Oxalis triangularis in the Czech Republic – Short Communication 

2014 ◽  
Vol 50 (No. 1) ◽  
pp. 17-18
Author(s):  
I. Šafránková
Keyword(s):  
Czech Republic ◽  
Leaf Spot ◽  
Short Communication ◽  
Rust Disease ◽  
The Czech Republic ◽  
First Report ◽  
Microscopic Features

This is the first report of Puccinia oxalidis causing leaf spot diseases on ornamental Oxalis triangularis subsp. papilionaceae cv. Atropurpurea in Moravia, Czech Republic. The macroscopic symptoms and microscopic features are described.

scholarly journals Short communication. Phytophthora nicotianae, the causal agent of root and crown rot (Tristeza disease) of red pepper in La Vera region (Cáceres, Spain)

2010 ◽  
Vol 8 (3) ◽  
pp. 770 ◽  
Author(s):  
M. C. Rodríguez-Molina ◽  
M. C. Morales-Rodríguez ◽  
C. Palo Osorio ◽  
E. Palo Núñez ◽  
E. Verdejo Alonso ◽  
...  
Keyword(s):  
Short Communication ◽  
Causal Agent ◽  
Phytophthora Nicotianae ◽  
Crown Rot ◽  
Red Pepper ◽  
Root And Crown Rot

scholarly journals First Report of Orange Rust Disease of Sugarcane in the Dominican Republic

Plant Disease ◽  
2014 ◽  
Vol 98 (7) ◽  
pp. 1010-1010 ◽  
Author(s):  
G. C. Briggs ◽  
Z. Nakhid ◽  
A. T. Alleyne ◽  
J. Ayats ◽  
J. O. Despradel ◽  
...  
Keyword(s):  
Dominican Republic ◽  
Consensus Sequence ◽  
Pcr Amplification ◽  
Causal Agent ◽  
Sequence Length ◽  
Rust Disease ◽  
Distinctive Features ◽  
Economic Impact Assessment ◽  
Entire Sequence ◽  
Plant Pathol

In June 2011, uredinial leaf lesions typical of rust disease were observed on the two main commercial sugarcane (a complex Saccharum spp. L. hybrid) cultivars CR87339 (30% of acreage), CR83323 (17% of acreage) as well as cultivars BR9806, BR9816, and BT88133 at La Romana in the Dominican Republic. Morphological analysis of the lesions using both light and scanning electron microscopy identified obovoid spores (36 × 24 μm) with apical wall thickenings which are distinctive features of Puccinia kuehnii (W. Krüger) E.J. Butler, the causal agent of orange rust disease of sugarcane (4). DNA from dried leaf samples containing urediniospores was extracted and PCR-amplified using the P. kuehnii specific primers (Pk1-F/Pk1-R) (1). A 527-bp fragment representing the ITS rDNA region was obtained and sequenced. A GenBank BLAST search of the database of the consensus sequence showed 100% sequence identity to the GenBank accession GU564421 along the entire sequence length. Based on field observations, urediniospore morphology, PCR amplification, and DNA sequence analysis, the causal agent of the observed rust disease was therefore confirmed to be P. kuehnii. Since its initial discovery, orange rust disease has been observed in 15 additional sugarcane cultivars at the Central Romana Sugarcane Corp. Ltd. at La Romana and has persisted during the years 2012 and 2013. Central Romana Sugarcane Corp. Ltd. is the largest sugarcane grower (70,000 ha) and sugar producer (430,000 t annually) in the Caribbean. Although an economic impact assessment of the disease has not been performed at La Romana, orange rust disease has the potential to cause significant yield loss (1). Orange rust has been reported previously in several parts of Central America and in the neighboring islands of Cuba and Jamaica in 2010 (2,3). To our knowledge, this is the first confirmed report of orange rust disease of sugarcane in the Dominican Republic. References: (1) J. C. Comstock et al., J. ASSCT. 29:82, 2009. (2) N. C. Glynn et al. Plant Pathol. 59:703, 2010. (3) L. Pérez-Vicente et al. Plant Pathol. 59:804, 2010. (4) E. V. Virtudazo et al., Mycoscience 42:167, 2001.

scholarly journals Pathogenic Variation in Xanthomonas Albilineans (Ashby) Dowson, the Causal Agent of Leaf-Scald Disease of Sugar Cane

1973 ◽  
Vol 26 (4) ◽  
pp. 781 ◽  
Author(s):  
GJ Persley
Keyword(s):  
Sugar Cane ◽  
Causal Agent ◽  
Leaf Scald ◽  
Pathogenic Variation ◽  
Xanthomonas Albilineans

The comparative pathogenicity of four isolates of X. albilineans was examined on 13 varieties of sugar cane. The isolates could be differentiated on the basis of their aggressiveness on seven varieties. The significance of varying aggressiveness of isolates in the epiphytology of the disease, and in the screening of varieties, is discussed.

scholarly journals Short communication: Dieback of rose caused by Acremonium sclerotigenum as a new causal agent of rose dieback in Iran

2016 ◽  
Vol 14 (4) ◽  
pp. e10SC03 ◽  
Author(s):  
Maryam Mirtalebi ◽  
Zia Banihashemi ◽  
Fatemeh Sabahi ◽  
Hamze Mafakheri
Keyword(s):  
Ribosomal Rna ◽  
Internal Transcribed Spacer ◽  
Short Communication ◽  
Extended Period ◽  
Its Region ◽  
Causal Agent ◽  
Fars Province ◽  
Adverse Conditions ◽  
Brown Discoloration ◽  
Symptomatic Tissue

Severe dieback of rose has been recently observed in several rose greenhouses in Fars province of Iran. During 2014 and 2015, stems of rose plants showing yellow to brown discoloration and dieback were collected from rose greenhouses. Coniothyrium fuckelii, Botrytis cinerea and Acremonium were subsequently isolated from the margin between healthy and symptomatic tissue. B. cinerea and C. fuckelii isolates were similar to those previously reported for dieback of rose worldwide. Morphological and cultural characters along with molecular analysis based on partial sequences of the internal transcribed spacer (ITS) region of the ribosomal RNA genome allowed confirming the affiliation of the Acremonium isolates, corresponding to A. sclerotigenum as a new causal agent of rose dieback. To determine its pathogenicity on rose, Koch's postulates were fulfilled by stem inoculation of nine rose cultivars under greenhouse conditions. While A. sclerotigenum is considered as a soil-born pathogen, and produces sclerotia that are resistant to adverse conditions enables the fungus to survive extended period in soil, propagule trapping in our study revealed that conidia can become airborn, imply that an aerial phase, forms an important component of the disease cycle.

scholarly journals Identification of a rust disease of giant knapweed in the Czech Republic – short communication

2017 ◽  
Vol 53 (No. 3) ◽  
pp. 153-158
Author(s):  
Petrželová Irena ◽  
Jemelková Michaela ◽  
Doležalová Ivana ◽  
Ondřej Vladan ◽  
Kitner Miloslav
Keyword(s):  
Czech Republic ◽  
Molecular Identification ◽  
Short Communication ◽  
Nucleotide Sequences ◽  
Its2 Region ◽  
Rust Disease ◽  
The Czech Republic ◽  
Severe Infections ◽  
Ornamental Species

During the vegetation seasons 2012–2015, symptoms of severe infections by a rust disease were recorded on plants of the ornamental species Centaurea macrocephala. Based on morphology, the pathogen was identified as Puccinia jaceae or Puccinia hieracii, which have recently been considered as synonyms. However, substantial differences between P. jaceae and P. hieracii in nucleotide sequences of the ITS2 region provide evidence for the molecular identification of the specimen as P. jaceae. 

Evidence for the existence of a single race of common rust caused by Puccinia melanocephala, in Australian sugar cane cultivars

1992 ◽  
Vol 43 (3) ◽  
pp. 443 ◽  
Author(s):  
PWJ Taylor
Keyword(s):  
Sugar Cane ◽  
Generation Time ◽  
Stem Elongation ◽  
Host Reaction ◽  
Pathogen Population ◽  
Rust Disease ◽  
Detached Leaf ◽  
Puccinia Melanocephala ◽  
Physiological Race ◽  
New Races

A detached-leaf method for testing for physiological races of common rust disease, caused by Puccinia melanocephala, in Australian sugar cane cultivars is described. Single-uredium isolates collected from various locations in Queensland, Australia, between 1978 and 1986 were screened. Host reaction type was specific to individual cultivars and did not vary when these cultivars were inoculated with different rust isolates. For each cultivar there was no difference in generation time for each isolate. These results suggest that there is only one physiological race present in the pathogen population in Queensland. Reported changes in the severity of common rust disease in sugarcane cultivars were caused by changes in environmental conditions rather than the development of new races of the pathogen. Rust infection fluctuated during the growth of sugar cane, with a major peak occurring at tillering and stem elongation, following moderate rainfall and temperatures between 12 and 25�C. Rust was more severe on older leaves than on younger leaves.

scholarly journals First Report of Puccinia kuehnii, Causal Agent of Orange Rust of Sugarcane, in Brazil

Plant Disease ◽  
2010 ◽  
Vol 94 (9) ◽  
pp. 1170-1170 ◽  
Author(s):  
D. Barbasso ◽  
H. Jordão ◽  
W. Maccheroni ◽  
J. Boldini ◽  
J. Bressiani ◽  
...  
Keyword(s):  
Sao Paulo ◽  
Causal Agent ◽  
Western Hemisphere ◽  
Asia Pacific ◽  
São Paulo ◽  
Rust Disease ◽  
First Report ◽  
Southern States ◽  
Specialized Team ◽  
The City

In December 2009, on a farm located near the city of Rincão, state of São Paulo, Brazil, uredinial leaf lesions typical of a rust disease were observed to be affecting sugarcane (a complex Saccharum L. hybrid). Lesions were observed in a nursery plot of a precommercial cultivar (cv. Centauro) known to be resistant to brown rust caused by Puccinia melanocephala Syd. & P. Syd. Leaf samples, inspected under a light microscope, revealed spores identical morphologically to those described for the fungus P. kuehnii E.J. Butler, causal agent of sugarcane orange rust (1,3). Telia and teliospores were not observed. The Ministry of Agriculture was notified on 7 December 2009 in accordance with current Brazilian quarantine legislation. On 9 December, a specialized team from the Federal Phytosanitary Defense Department (DSV/MAPA) started a survey at the farm, collected leaf samples for additional analyses, and confirmed the presence of P. kuehnii E.J. Butler in Brazilian territory. During the following weeks, the disease was observed in several sugarcane-growing areas of the southern states of São Paulo and Paraná. It affected a small proportion of clones under selection in several breeding programs and the commercial cultivars SP89-1115, RB72454, and SP84-2025, which are now considered to be highly susceptible to the disease and currently cover less than 10% of the country's commercial sugarcane area. To our knowledge, this is the first report of P. kuehnii infecting sugarcane in Brazil, the largest world producer with more than 8 million ha of this crop. Orange rust is expected to expand to other important Brazilian sugarcane-producing areas, including the northeastern states and a new sugarcane expansion area in the central part of Brazil. The disease is widespread in the Asia-Pacific Region, caused a major epidemic in Australia in 2000, and was reported in the Western Hemisphere in 2007–2008 in several countries in North (1,2) and Central America (2,3) prior to this detection in South America. References: (1) J. C. Comstock et al. Plant Dis. 92:175, 2008. (2) R. C. Flores et al. Plant Dis. 93:1347, 2009. (3) W. Ovalle et al. Plant Dis. 92:973, 2008.

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