Effects of fungicide on growth of Leptosphaeria maculans and L. biglobosa in relation to development of phoma stem canker on oilseed rape (Brassica napus)

Huang, Yongju; Hood, J. R.; Eckert, Mária; Stonard, J. F.; Cools, H. J.; King, Graham J.; Rossall, S.; Ashworth, M.; Fitt, Bruce D.L.

doi:10.1111/j.1365-3059.2010.02416.x

Cited by 29 publications

(50 citation statements)

References 51 publications

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“…Efficacy of triazole fungicide metconazole was likely to have also been influenced by the proportions of L. maculans and L. biglobosa, the 2 coexisting Leptosphaeria species on oilseed rape in Lithuania (Brazauskienė et al, 2011b). It was shown by Eckert et al (2010) and Huang et al (2011) that triazole fungicides flusilazole and tebuconazole were more effective against L. maculans than against L. biglobosa. Winter rape cultivars showed significant differences in their susceptibility to basal phoma canker and upper stem lesions; however, neither of the cultivars showed high resistance to this disease.…”

Section: Discussionmentioning

confidence: 99%

“…Fungicide use in 2010 gave effective control of fungal diseases; however, seed yield increase was not significant, which was probably due to insufficient control of sclerotinia stem rot during that season. Huang et al (2011) reported that cultivars differ in their yield response to the fungicide treatment. During our research, significant and positive yield response to the fungicide application was obtained in almost all tested cultivars in 2008 and 2009; however, the cultivars that were higher yielding without treatment (Insider, Sunday, Monalisa, Rally, and Titan) showed lower response to the fungicide application in 2008 but not in 2009.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Susceptibility of winter rape cultivars to fungal diseases and their response to fungicide application

Brazauskienė¹,

Petraitienė²,

Brazauskas³

et al. 2013

Turk J Agric For

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Susceptibility of winter rape cultivars to fungal diseases and their response to fungicide application

Brazauskienė¹,

Petraitienė²,

Brazauskas³

et al. 2013

Turk J Agric For

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“…A few studies have investigated the effect of fungicide on L. maculans and L. biglobosa, and most of these studies revealed that L. maculans was more sensitive to fungicides than L. biglobosa (Griffiths et al 2003;Eckert et al 2010;Huang et al 2011). Among different L. maculans isolates, variations in sensitivity to QoI fungicides (fungicides with the action mode of action of Quinone outside inhibitor) were observed in Canada (Liu 2014).…”

Section: Integrated Blackleg Management Strategiesmentioning

confidence: 99%

“…Foliar fungicide applications have been proven to be of limited value to maintain canola yield (Huang et al 2011;Liu 2014). A few studies have investigated the effect of fungicide on L. maculans and L. biglobosa, and most of these studies revealed that L. maculans was more sensitive to fungicides than L. biglobosa (Griffiths et al 2003;Eckert et al 2010;Huang et al 2011).…”

Section: Integrated Blackleg Management Strategiesmentioning

confidence: 99%

Insights into fighting against blackleg disease of Brassica napus in Canada

Zhang

Fernando

2018

Crop Pasture Sci.

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Abstract. Blackleg disease, caused by the ascomycete fungal pathogen Leptosphaeria maculans, is a devastating disease of canola (Brassica napus) in Australia, Canada and Europe. Although cultural strategies such as crop rotation, fungicide application, and tillage are adopted to control the disease, the most promising disease control strategy is the utilisation of resistant canola varieties. However, field populations of L. maculans display a high evolutionary potential and are able to overcome major resistance genes within a few years, making disease control relying on resistant varieties challenging. In the early 1990s, blackleg resistance gene Rlm3 was introduced into Canadian canola varieties and provided good resistance against the fungal populations until the early 2000s, when moderate to severe blackleg outbreaks were observed in some areas across western Canada. However, the breakdown of Rlm3 resistance was not reported until recently, based on studies on R genes present in Canadian canola varieties and the avirulence allele frequency in L. maculans populations in western Canada. The fact that Rlm3 was overcome by the evolution of fungal populations demands canola breeding programs in Canada to be prepared to develop canola varieties with diversified and efficient R genes. In addition, frequent monitoring of fungal populations can provide up-to-date guidance for proper resistance genes deployment. This literature review provides insights into the outbreaks and management of blackleg disease in Canada.

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“…Huang et al (2011) have shown that effects of fungicide on interactions between L. maculans and L. biglobosa in autumn play an important role in determining the relationship between autumn fungicide treatments and severity of phoma stem canker in the following summer. Quantitative real-time PCR could be used to detect spores and mycelium of numerous phytopathogens.…”

Section: Microscopic and Molecular Detection Of Leptosphaeria Maculanmentioning

confidence: 99%

Microscopic and molecular detection of Leptosphaeria maculans and L. biglobosa ascospore content in air samples

Piliponytė-Dzikienė

Kaczmarek

Petraitienė

et al. 2014

Zemdirbyste-Agriculture

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Airborne sexual spores of Leptosphaeria maculans and L. biglobosa are primary inoculum of fungi causing phoma stem canker of oilseed rape. In this study ascospore release of these two species was compared between Lithuania (of autumn 2010 and 2011) and Poland (autumns of 2009 till 2012), using identical equipment and methods. Dynamics of L. maculans and L. biglobosa ascospore dispersal was investigated using volumetric samplers followed by microscopic and molecular methods of detection. In Lithuania, the earliest detection of Leptosphaeria ascospores, using microscopy was on 1 st September (2010) and on 2 nd September (2011), whereas in Poland the earliest detection was on 5th September (2009 and and the latest on 11 th October (2011), which demonstrates that differences between the seasons may exceed a month (36 days). In the case of molecular detection performed for the Polish samples, the dates of the earliest and the latest release of the first ascospores ranged from 5 th September to 15 th October (40 days). The number of days with ascospores detected in the air samples ranged from 6 (2012) to 25 (2009). At earliest, the detection of the highest concentration of ascospores was on 6 th September (2010) and the latest -on 28 th October (2009). These results demonstrate big differences between the results of spore monitoring between the years and the importance of aerobiological studies to follow the development of the pathogen in natural infection. The fluctuations in quantities of spores and fungal deoxyribonucleic acid (DNA) strongly depended on the weather conditions, mainly rainfall, air temperature and relative humidity. Ascospore release was observed immediately after the rainfall events, but not later than two days after the rainfall. On days without rain, spores were present in the air samples when average relative air humidity exceeded 90% and day temperature was below 15°C. In 2009, molecular detection revealed the presence of both fungal species in the air samples, whereas in 2010-2012 only L. biglobosa DNA was found. Molecular detection with a quantitative real-time polymerase chain reaction (qPCR) was identified as a fast and accurate method of pathogen detection and identification from air samples. The highest coefficient of correlation between microscopic and molecular detection of Leptosphaeria species was 0.828 (2009) and the lowest was 0.483 (2011); in all years both techniques of detection were statistically correlated. We have demonstrated that the correlation coefficient highly depended on the number of ascospores in air samples. Based on the studies performed in Lithuania and Poland, we have shown that climatic conditions in the northern part of Central Europe are favourable for the spread of Leptosphaeria spp. by ascospores; however, the patterns of ascospore release greatly differ between the both countries.

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Effects of fungicide on growth of Leptosphaeria maculans and L. biglobosa in relation to development of phoma stem canker on oilseed rape (Brassica napus)

Cited by 29 publications

References 51 publications

Susceptibility of winter rape cultivars to fungal diseases and their response to fungicide application

Susceptibility of winter rape cultivars to fungal diseases and their response to fungicide application

Insights into fighting against blackleg disease of Brassica napus in Canada

Microscopic and molecular detection of Leptosphaeria maculans and L. biglobosa ascospore content in air samples

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