scholarly journals CHEMICAL CONTROL OF ASIAN SOYBEAN RUST AS A FUNCTION OF CULTIVAR, ROW SPACING AND SPRAY BAR SUPPORT SYSTEMS

2019 ◽  
Vol 39 (4) ◽  
pp. 504-511
Author(s):  
Laercio L. Hoffmann ◽  
Rafael Roehrig ◽  
Walter Boller ◽  
Carlos A. Forcelini
Keyword(s):  
Chemical Control ◽  
Support Systems ◽  
Soybean Rust ◽  
Row Spacing ◽  
Asian Soybean Rust

scholarly journals Phosphate Fertilization Reduces the Severity of Asian Soybean Rust Under High Disease Pressure

2018 ◽  
Vol 11 (1) ◽  
pp. 261
Author(s):  
Ana Claudia R. Mochko ◽  
Laércio Zambolim ◽  
Douglas F. Parreira
Keyword(s):  
Chemical Control ◽  
Good Control ◽  
Plant Diseases ◽  
Low Fertility ◽  
Soybean Rust ◽  
High Fertility ◽  
Asian Soybean Rust ◽  
Progress Curve ◽  
Phosphate Fertilization ◽  
Disease Pressure

Mineral nutrition of plants is a strategy that can be used in the management of plant diseases. Therefore, the objective of this work is to determine which phosphorus dose reduces the severity of Asian soybean rust (Phakopsora pachyrhizi) with or without chemical control. Two trials were conducted under field conditions with six P doses (0, 25, 50, 100, 200 and 400 mg/dm³), and two trials in 100 L pots at P doses 0, 100, 200 and 400 mg/dm3. The inoculation of border rows and inoculation directly on plants in pots was performed with 105/mL of fungus urediniospores 15 days before the application of fungicide to increase the disease pressure. The application of fungicide (azoxystrobin + ciproconazole) was carried out at the R1 stage, and afterwards the mixture was reapplied three times in chemical control treatments. The results showed that the application of triazol + strobilurin fungicides in the presence of P decreased the severity of the disease (area under disease progress curve and disease infection rate) greater than in the absence of the fungicides. The productivity and levels of chlorophyll a, b and total also increased with chemical control in the presence of P. The dose 400 mg/dm3 of P was the most efficient in a soil with a low fertility, and 200 mg/dm³ was efficient in a soil with a high fertility. In conclusion the application of the fungicides triazol + strobilurin was very important to get good control of Asian soybean rust; phosphate fertilization contributed to the amelioration of Asian soybean rust.

scholarly journals Integration between genetic and chemical control on the progress of Asian soybean rust and yield

2020 ◽  
Vol 46 (3) ◽  
pp. 198-204
Author(s):  
Deivid Sacon ◽  
Aline Netto ◽  
Michele Fochesatto ◽  
Francine Spitza Stefanski ◽  
Alessandra Gallina ◽  
...  
Keyword(s):  
Genetic Control ◽  
Chemical Control ◽  
Yield Components ◽  
Block Design ◽  
Soybean Rust ◽  
Rio Grande Do Sul ◽  
Thousand Grain Weight ◽  
Asian Soybean Rust ◽  
Progress Curve ◽  
Randomized Block Design

ABSTRACT The objective of this study was to evaluate the genetic control integrated to the chemical control of Asian soybean rust (ASR) and the effects of these measures on crop yield. The experiment was conducted in Erechim, Rio Grande do Sul State, Brazil, in 2016/17 and 2017/18 crop years, under a randomized block design, in a subdivided plot scheme (cultivars in the plots and fungicides in the subplots), with four replicates. The following cultivars were used: BMX Vanguarda (without ASR tolerance); TMG 7062; TMG 7262, and TMG 7161, tolerant to ASR (Inox™ Technology cultivars). The fungicides used were: T1) control (without application of fungicides); T2) azoxystrobin + benzovindiflupyr; T3) difenoconazole + cyproconazole; T4) trifloxystrobin + prothioconazole, and T5) epoxiconazole + fluxapyroxad + pyraclostrobin. Four fungicide applications were carried out at the V6, R1, R5.1 and R6 stages. During the experiment, for the calculation of the area under disease progress curve (AUDPC), disease severity was assessed at 7-day intervals in a random sample of 10 trifolia per plot. After harvest, yield components were determined: number of grains per plant, thousand grain weight (g), and yield (kg ha-1). In 2017/18 crop year, the fungicide difenoconazole + cyproconazole was not efficient for ASR control. The soybean cultivars TMG 7062, TMG 7161 and TMG 7261 delayed the disease progression; however, only TMG 7161 presented tolerance in the presence of the inoculum in 2016/17 and 2017/18 crop years. The association between chemical and genetic control is shown to be efficient for ASR control.

The combined use of spray volumes and droplet sizes in the chemical control of Asian soybean rust in cultivars with different leaf area indices

2020 ◽  
Vol 136 ◽  
pp. 105212
Author(s):  
Amanda Chechi ◽  
Rafael Roehrig ◽  
Bruna Piton ◽  
Magda Ribeiro da Luz ◽  
Carolina Cardoso Deuner ◽  
...  
Keyword(s):  
Leaf Area ◽  
Chemical Control ◽  
Soybean Rust ◽  
Asian Soybean Rust ◽  
Combined Use ◽  
Droplet Sizes

scholarly journals Potassium Fertilization Reduces the Severity of Asian Soybean Rust Under High Disease Pressure

2019 ◽  
Vol 11 (11) ◽  
pp. 116
Author(s):  
Laércio Zambolim ◽  
Ana Claudia R. Mochko ◽  
Douglas Ferreira Parreira ◽  
Samuel Vasconcelos Valadares
Keyword(s):  
Chlorophyll A ◽  
Chemical Control ◽  
Block Design ◽  
Soybean Rust ◽  
Cellular Processes ◽  
Asian Soybean Rust ◽  
Potassium Fertilization ◽  
Progress Curve ◽  
Severity Of The Disease ◽  
Disease Pressure

Potassium (K) is one of the essential nutrients for plants and is involved in many cellular processes which might influence the severity of diseases. There are few reports of the effect of increasing concentrations of K in the field on the severity of the Asian soybean rust (ASR) caused by Phakopsora pachyrhizi. In this context, the objective of this work was to verify the influence of increasing concentrations of K on ASR, in the absence and presence of chemical control, in conditions that highly favored the development of the disease. Two experiments were conducted under field conditions and two also in the field but in pots with a capacity of 100 L. Evaluated concentrations of K were 0.0, 100, 200, and 400 mg/dm³, respectively in a randomized complete block design. The application of the fungicide mixture azoxystrobin (200 g/L) + cyproconazol (80 g/L) was performed at 45, 60, and 75 days after emergence. The severity of the disease, area under the disease progress curve (AUDPC), rate of disease progression (r), soybean productivity, and contents of chlorophyll a, b and total were evaluated. The severity, AUDPC, and r decreased with the increase of the concentration of K and fungicide application, while the rate of disease control and soybean productivity increased. Contents of chlorophyll a, b and total also had higher values according to the increase in the concentration of K. Potassium fertilization reduced the severity of ASR and grain yield under high disease pressure with or without chemical control.

Asian Soybean Rust Sentinel Plots

2006 ◽  
Author(s):  
Ralph von Qualen ◽  
Xiao-Bing Yang
Keyword(s):  
Soybean Rust ◽  
Asian Soybean Rust

Asian Soybean Rust Sentinel Plots

2006 ◽  
Author(s):  
Ralph von Qualen ◽  
Xiao-Bing Yang
Keyword(s):  
Soybean Rust ◽  
Asian Soybean Rust

Identification and classification of Asian soybean rust using leaf-based hyperspectral reflectance

2021 ◽  
Vol 42 (11) ◽  
pp. 4177-4198
Author(s):  
Renato Herrig Furlanetto ◽  
Marcos Rafael Nanni ◽  
Monica Sayuri Mizuno ◽  
Luís Guilherme Teixeira Crusiol ◽  
Camila Rocco da Silva
Keyword(s):  
Soybean Rust ◽  
Hyperspectral Reflectance ◽  
Asian Soybean Rust

Registration of Asian Soybean Rust-Resistant Soybean Germplasm G01-PR16

2011 ◽  
Vol 5 (1) ◽  
pp. 118-122 ◽  
Author(s):  
H. Roger Boerma ◽  
Maria J. Monteros ◽  
Bo-Keun Ha ◽  
E. Dale Wood ◽  
Daniel V. Phillips ◽  
...  
Keyword(s):  
Soybean Rust ◽  
Soybean Germplasm ◽  
Asian Soybean Rust

scholarly journals Transcriptome analyses and virus induced gene silencing identify genes in the Rpp4-mediated Asian soybean rust resistance pathway

2013 ◽  
Vol 40 (10) ◽  
pp. 1029 ◽  
Author(s):  
Aguida M. A. P. Morales ◽  
Jamie A. O'Rourke ◽  
Martijn van de Mortel ◽  
Katherine T. Scheider ◽  
Timothy J. Bancroft ◽  
...  
Keyword(s):  
Gene Expression ◽  
Transcription Factors ◽  
Gene Silencing ◽  
Differentially Expressed ◽  
Soybean Rust ◽  
Phakopsora Pachyrhizi ◽  
R Gene ◽  
Virus Induced Gene Silencing ◽  
Asian Soybean Rust ◽  
Defence Responses

Rpp4 (Resistance to Phakopsora pachyrhizi 4) confers resistance to Phakopsora pachyrhizi Sydow, the causal agent of Asian soybean rust (ASR). By combining expression profiling and virus induced gene silencing (VIGS), we are developing a genetic framework for Rpp4-mediated resistance. We measured gene expression in mock-inoculated and P. pachyrhizi-infected leaves of resistant soybean accession PI459025B (Rpp4) and the susceptible cultivar (Williams 82) across a 12-day time course. Unexpectedly, two biphasic responses were identified. In the incompatible reaction, genes induced at 12 h after infection (hai) were not differentially expressed at 24 hai, but were induced at 72 hai. In contrast, genes repressed at 12 hai were not differentially expressed from 24 to 144 hai, but were repressed 216 hai and later. To differentiate between basal and resistance-gene (R-gene) mediated defence responses, we compared gene expression in Rpp4-silenced and empty vector-treated PI459025B plants 14 days after infection (dai) with P. pachyrhizi. This identified genes, including transcription factors, whose differential expression is dependent upon Rpp4. To identify differentially expressed genes conserved across multiple P. pachyrhizi resistance pathways, Rpp4 expression datasets were compared with microarray data previously generated for Rpp2 and Rpp3-mediated defence responses. Fourteen transcription factors common to all resistant and susceptible responses were identified, as well as fourteen transcription factors unique to R-gene-mediated resistance responses. These genes are targets for future P. pachyrhizi resistance research.

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