Plant age and ambient temperature: significant drivers for powdery mildew (Erysiphe cruciferarum ) epidemics on oilseed rape (Brassica napus )

2017 ◽  
Vol 67 (2) ◽  
pp. 445-456 ◽  
Author(s):  
M. B. Uloth ◽  
M. P. You ◽  
M. J. Barbetti
Keyword(s):  
Brassica Napus ◽  
Powdery Mildew ◽  
Ambient Temperature ◽  
Oilseed Rape ◽  
Plant Age ◽  
Erysiphe Cruciferarum

scholarly journals First Report of Powdery Mildew Caused by Erysiphe cruciferarum on Brassica napus in China

Plant Disease ◽  
2015 ◽  
Vol 99 (11) ◽  
pp. 1651-1651 ◽  
Author(s):  
J. T. Alkooranee ◽  
S. Liu ◽  
T. R. Aledan ◽  
Y. Yin ◽  
M. Li
Keyword(s):  
Brassica Napus ◽  
Powdery Mildew ◽  
First Report ◽  
Erysiphe Cruciferarum

scholarly journals First Report of Powdery Mildew Caused by Erysiphe cruciferarum on Brassica juncea in Australia

Plant Disease ◽  
2008 ◽  
Vol 92 (4) ◽  
pp. 650-650 ◽  
Author(s):  
P. Kaur ◽  
C. X. Li ◽  
M. J. Barbetti ◽  
M. P. You ◽  
H. Li ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Brassica Juncea ◽  
Oilseed Rape ◽  
Western Australia ◽  
Indian Mustard ◽  
Pathogenic Fungi ◽  
Research Centre ◽  
Width Ratio ◽  
Oilseed Crop ◽  
Erysiphe Cruciferarum

In Australia, Brassica juncea (L.) Czern & Coss (Indian mustard) has the potential as a more drought-tolerant oilseed crop than the B. napus L., with the first canola-quality B. juncea varieties released in Australia in 2006 and first sown for commercial production in 2007. Increased production of B. juncea is expected to result in the appearance of diseases previously unreported in Australia. In the spring of 2007 at the University of Western Australia field plots at Crawley (31.99°S, 115.82°E), Western Australia, plants of B. juncea genotypes from Australia and China had extensive stem colonization by powdery mildew at the end of the flowering period, with whitish patches ranging in size from 3 mm to 3 cm long. These patches coalesced to form a dense, white, powdery layer as they expanded. Pathogenicity was demonstrated by gently pressing infected stems containing abundant sporulation onto leaves of potted B. juncea seedlings of variety JM-18, incubating the plants in a moist chamber for 48 h, and then maintaining the plants in a controlled-environment room at 18/13°C for day/night. Signs of powdery mildew appeared at 7 days after inoculation, and by 10 days, it was well developed. Uninoculated control plants did not have powdery mildew. When symptomatic plants were examined, abundant conidia were typical of Erysiphe cruciferarum Opiz ex Junell, with cylindrical conidia borne singly or in short chains as described previously (2). Mycelia were amphigenous, in patches, and often spreading to become effused. Conidiophores were straight, foot cells were cylindrical, and conidia were mostly produced singly and measured 21.2 to 35.4 (mean 26.7 μm) × 8.8 to 15.9 μm (mean 11.9 μm) from measurements of 100 conidia. The spore size that we measured approximated what was found for E. cruciferarum (2) (30 to 40 × 12 to 16 μm), since we found 35 and 50% of spores falling within this range in terms of length and width, respectively. Conidia were, however, generally smaller in size than that reported on broccoli raab in California (1) (35 to 50 × 12 to 21 μm). We confirmed a length-to-width ratio greater than 2 as was found previously (1,2). Infected leaves showed signs of early senescence. While powdery mildew caused by E. cruciferarum is an important disease of B. juncea in India where yield losses as much as 17% have been reported (4), its potential impact in Australia is yet to be determined. To our knowledge, this is the first record of E. cruciferarum on B. juncea in Australia. In Western Australia, E. cruciferarum has been recorded on B. napus (oilseed rape) since 1986 and on B. napus L. var. napobrassica (L.) Reichenb. (swede) since 1971 (3). In other regions of Australia, it has been recorded on B. rapa in Queensland since 1913 and on B. napus (oilseed rape) in South Australia since 1973. References: (1) S. T. Koike and G. S. Saenz. Plant Dis. 81:1093, 1997. (2) T. J. Purnell and A. Sivanesan. No 251 in: Descriptions of Pathogenic Fungi and Bacteria. CMI, Kew, Surrey, UK, 1970. (3) R. G. Shivas. J. R. Soc. West. Aust. 72:1, 1989. (4) A. K. Shukla et al. Manual on Management of Rapeseed-Mustard Diseases. National Research Centre on Rapeseed-Mustard, Bharatpur, India, 2003.

Cultivar resistance offers the first opportunity for effective management of the emerging powdery mildew (Erysiphe cruciferarum) threat to oilseed brassicas in Australia

2016 ◽  
Vol 67 (11) ◽  
pp. 1179 ◽  
Author(s):  
M. B. Uloth ◽  
M. P. You ◽  
M. J. Barbetti
Keyword(s):  
Brassica Napus ◽  
Powdery Mildew ◽  
Effective Management ◽  
Cultivar Resistance ◽  
Resistant Cultivars ◽  
Progress Curve ◽  
Erysiphe Cruciferarum ◽  
Effective Option ◽  
Oilseed Brassicas ◽  
The Impact

Powdery mildew of brassicas, caused by Erysiphe cruciferarum, is an emerging threat to oilseed Brassica production in Australia. Resistance to powdery mildew was assessed in 112 current and historic Australian Brassica napus canola cultivars and five cultivars of B. juncea mustard cultivars under controlled environmental conditions. Only 18% of leaf area was infested by the end of the test on the most resistant cultivars, compared with means of up to 70% for the most susceptible cultivars as well as severe stem and pod infection. For B. napus, cultivars with the greatest potential for reducing the impact of powdery mildew in the field were Trooper, Bravo TT, Summit, Tumby, Narendra and Hyola 650TT, all ranked in the 10% of cultivars with the lowest leaf infestation (Area Under The Disease Progress Curve (AUDPC) <537) and with <10% of stem area infested. For B. juncea, the level of leaf infestation was lowest for Sahara CL and Xceed X121 CL (AUDPC 303 and 380 respectively), but the high levels of stem infestation (42% and 28% respectively) in these cultivars may reduce their usefulness in the field. The most resistant cultivars identified can be immediately deployed into regions where powdery mildew is prevalent, providing the canola industry with an immediate and effective option for management of this increasingly troublesome disease.

scholarly journals First Report of Powdery Mildew Caused by Erysiphe cruciferarum on Oilseed Rape in Korea

Plant Disease ◽  
2016 ◽  
Vol 100 (6) ◽  
pp. 1245-1245
Author(s):  
S. E. Cho ◽  
J. H. Park ◽  
Y. J. Choi ◽  
I. Y. Choi ◽  
H. D. Shin
Keyword(s):  
Powdery Mildew ◽  
Oilseed Rape ◽  
First Report ◽  
Erysiphe Cruciferarum

Identification of the powdery mildew caused by Erysiphe cruciferarum on Brassica napus in Russia

2021 ◽  
Author(s):  
Elena Mikhaylova ◽  
Michael Shein ◽  
Valentin Alexeev ◽  
Anna Sukhareva ◽  
Maria Panfilova
Keyword(s):  
Brassica Napus ◽  
Powdery Mildew ◽  
Erysiphe Cruciferarum

scholarly journals Genome Mining and Evaluation of the Biocontrol Potential of Pseudomonas fluorescens BRZ63, a New Endophyte of Oilseed Rape (Brassica napus L.) against Fungal Pathogens

2020 ◽  
Vol 21 (22) ◽  
pp. 8740
Author(s):  
Daria Chlebek ◽  
Artur Pinski ◽  
Joanna Żur ◽  
Justyna Michalska ◽  
Katarzyna Hupert-Kocurek
Keyword(s):  
Brassica Napus ◽  
Plant Growth ◽  
Pseudomonas Fluorescens ◽  
Oilseed Rape ◽  
Plant Growth Promotion ◽  
Fungal Pathogens ◽  
Growth Promotion ◽  
Genome Mining ◽  
Plant Colonization ◽  
Brassica Napus L

Endophytic bacteria hold tremendous potential for use as biocontrol agents. Our study aimed to investigate the biocontrol activity of Pseudomonas fluorescens BRZ63, a new endophyte of oilseed rape (Brassica napus L.) against Rhizoctonia solani W70, Colletotrichum dematium K, Sclerotinia sclerotiorum K2291, and Fusarium avenaceum. In addition, features crucial for biocontrol, plant growth promotion, and colonization were assessed and linked with the genome sequences. The in vitro tests showed that BRZ63 significantly inhibited the mycelium growth of all tested pathogens and stimulated germination and growth of oilseed rape seedlings treated with fungal pathogens. The BRZ63 strain can benefit plants by producing biosurfactants, siderophores, indole-3-acetic acid (IAA), 1-aminocyclopropane-1-carboxylate (ACC) deaminase, and ammonia as well as phosphate solubilization. The abilities of exopolysaccharide production, autoaggregation, and biofilm formation additionally underline its potential to plant colonization and hence biocontrol. The effective colonization properties of the BRZ63 strain were confirmed by microscopy observations of EGFP-expressing cells colonizing the root surface and epidermal cells of Arabidopsis thaliana Col-0. Genome mining identified many genes related to the biocontrol process, such as transporters, siderophores, and other secondary metabolites. All analyses revealed that the BRZ63 strain is an excellent endophytic candidate for biocontrol of various plant pathogens and plant growth promotion.

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