Tan spot of wheat caused by<i>Drechslera tritici-repentis</i>: Detection, transmission, and control in wheat seed

Carmona, Marcelo; Ferrazini, M.; Barreto, D.

doi:10.1556/crc.34.2006.2-3.236

Cited by 22 publications

(16 citation statements)

References 5 publications

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“…However, the interaction between the factors methods and varieties was not significant. Similar results were reported by Carmona et al. (1999, 2006) for other fungi belonging to the Dematiaceae family, such as Drechslera teres (Sacc).…”

Section: Discussionsupporting

confidence: 89%

Methods for Detection ofAlternaria padwickiiin Rice Seeds

Gutiérrez

Carmona

Reis³

2010

Journal of Phytopathology

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The fungus Alternaria padwickii has been frequently detected in seed tests of rice collected from commercial crops in Corrientes Province, Argentina. This pathogen causes germination inhibition, seedling death or spotted grains and is the causal agent of Alternaria leaf spot. The pathogen survives as mycelia and sclerotia on seeds, plant debris and soil. Four detection methods were compared in laboratory tests, to select the best for a quick identification of the fungus in seeds. The methods were (i) Blotter Test (ii) Potato glucose agar, (iii) Bean agar (BA) and (iv) Malt extract agar. Twenty seed samples of different varieties of rice collected from Empedrado, Goya, Ita´Ibate´, La Cruz, Mercedes, Paso de los Libres and Perugorrı´a localities (Corrientes, Argentina), were analyzed in the assays. The anova test and the Tukey multiple range test were applied on the data to compare the A. padwickii incidence among the varieties and detection methods. BA method was found more sensitive than other methods for A. padwickii. The incidence values ranged from 3.6 to 76%. The statistical analysis demonstrated that the BA method was the most efficient for the detection of seed pathogens, and it could be useful in studies of transmission and chemical control.

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Section: Discussionsupporting

confidence: 89%

Methods for Detection ofAlternaria padwickiiin Rice Seeds

Gutiérrez

Carmona

Reis³

2010

Journal of Phytopathology

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“…In this study, we established a maximum rate of seed transmission efficacy of 18.8% under field conditions. Both similar and higher rates of seed transmission have been reported for other leaf spots of cereals such as Drechslera avenae (Carmona et al 1999;Carmona et al 2004) and D. tritici-repentis (Carmona et al 2006;Schilder and Bergstrom 1992). Several factors are known to influence seed to crop infection, such as the number of infected seeds brought into the soil, the seeding rate, and the edaphic and climatic conditions.…”

Section: Discussionsupporting

confidence: 68%

Epidemiology and control of seed-borneDrechslera tereson barley

Carmona¹,

Barreto²,

Moschini³

et al. 2008

Cereal Research Communications

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Net blotch caused by Drechslera teres is an important disease in most barley-growing areas. To prevent the introduction of this pathogen into the field, seed treatment is recommended. The objectives of this research were to evaluate different fungicides for eradicating D. teres from the seed and the role of both infected and treated seeds in the epidemiology of the disease under field conditions. The three fungicides tested in vitro (iminoctadine, guazatine, and thiram + iprodione) were able to eliminate D. teres at the highest dose used in this study. Under field conditions, eradication of the pathogen was not achieved, but net blotch was significantly reduced.

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“…Compared with the untreated control, difenoconazole 15FS (the main ingredient of Dividend XL RTA in our study) did not increase wheat stand but increased grain yield (da Luz, 2003). In a study on the effectiveness of fungicide treatments on transmission of P. tritici-repentis to the wheat plumule, Carmona et al (2006) determined that in relation to the untreated control, iprodione (Rovral 50%) + triticonazole (Premis 2.5%) provided 71% control and difenoconazole (Dividend 3%) 36%, while tebuconazole (Raxil 2%) provided 14%. The latter results do not agree with our observations that products containing tebuconazole (Raxil MD and Raxil T) were more effective than Dividend XL RTA in improving the performance of plants derived from infected durum wheat seed.…”

Section: Resultsmentioning

confidence: 99%

“…Improving seedling vigour and plant stand is important to reduce the damage caused by P. tritici-repentis under less than optimal growing conditions, such as has occurred in Saskatchewan for most of the past decade (Environment Canada, 2009). A significant improvement in seedling emergence and grain yield, or reduced transmission of P. tritici-repentis, was previously reported in common wheat with the use of selected fungicide seed treatments (da Luz, 2003;Krzyzinska et al, 2005;Carmona et al, 2006). The effect of fungicide seed treatments currently registered in Canada on P. tritici-repentis-infected durum wheat seed is not known, and no claims regarding this disease have been made for any of these products.…”

Section: Introductionmentioning

confidence: 99%

Improvement of emergence and performance of plants derived from red-smudged durum wheat seed by fungicide seed treatments

Fernandez

Vujanovic

2011

Canadian Journal of Plant Pathology

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A controlled-environment study was conducted to determine the effectiveness of eight fungicide seed treatments registered in Canada in improving the emergence, growth and performance of durum wheat 'AC Navigator' seedlings and plants derived from red-smudged seed (Pyrenophora tritici-repentis). There were three untreated controls consisting of infected and uninfected seed grown in the greenhouse or in the field. Seedling emergence was reduced in the untreated infected control compared with the untreated uninfected controls. Relative to the untreated red smudge control, all fungicide treatments, except for Dividend XL RTA (difenoconazole and metalaxyl-M), improved seedling emergence. However, no fungicide treatment resulted in emergence as high as in the untreated uninfected controls. In all treatments, lack of seedling emergence was attributed mostly to post-germination death and poor vigour. Compared with the untreated red smudge control, most fungicide treatments did not improve the seedling and plant growth parameters measured in this study. Total number of spikes was lower in plants derived from untreated infected than from uninfected seed or from seed treated with Dynasty 100FS (azoxystrobin). The number of spikes with fully formed kernels was higher in plants derived from uninfected seed or from seed treated with Dynasty 100FS or Raxil T (tebuconazole and thiram) than in plants derived from untreated infected seed. The number of kernels was also lower in plants derived from untreated infected than from uninfected seed or seed treated with Dynasty 100FS. Grain yield was lower for plants in the untreated infected than uninfected control, while yield in the latter was similar to the yield of plants in the Dynasty 100FS, Raxil MD (tebuconazole and metalaxyl), or BASF experimental product treatments. Overall, Dynasty 100FS was most effective in consistently improving the performance and productivity of durum wheat plants derived from red-smudged seeds.Résumé Une étude phytotronique a été menée afin de déterminer l'efficacité de huit traitements fongicides des semences, homologués au Canada, visant à améliorer la levée, la croissance et le rendement des semis du cultivar de blé dur 'AC Navigator' et de plants issus de semences infectées par la carie rouge (Pyrenophora tritici-repentis). Nous avons utilisé trois témoins non traités incluant des semences infectées et non infectées, cultivées en serres et en champs. Chez les témoins infectés et non traités, la levée des semis a été retardée, comparativement aux témoins non infectés et non traités. En ce qui a trait aux témoins non traités infectés par la carie rouge, tous les traitements fongicides, sauf Dividend XL RTA (difénoconazole et métalaxyl-M), ont contribué à améliorer la levée des semis. Toutefois, aucun traitement n'a permis d'atteindre une levée aussi vigoureuse qu'ont connue les témoins non traités et non infectés. Pour tous les traitements, la faible levée des semis était principalement imputée à la mort suivant la germination ainsi qu'à un manque de v...

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Tan spot of wheat caused byDrechslera tritici-repentis: Detection, transmission, and control in wheat seed

Cited by 22 publications

References 5 publications

Methods for Detection ofAlternaria padwickiiin Rice Seeds

Methods for Detection ofAlternaria padwickiiin Rice Seeds

Epidemiology and control of seed-borneDrechslera tereson barley

Improvement of emergence and performance of plants derived from red-smudged durum wheat seed by fungicide seed treatments

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