scholarly journals Modeling of Yield Losses and Risk Analysis of Fungicide Profitability for Managing Fusarium Head Blight in Brazilian Spring Wheat

2019 ◽  
Author(s):  
Maíra Rodrigues Duffeck ◽  
Kaique dos Santos Alves ◽  
Franklin Jackson Machado ◽  
Paul David Esker ◽  
Emerson Medeiros Del Ponte
Keyword(s):  
Fusarium Head Blight ◽  
Field Trials ◽  
Random Coefficients ◽  
Review Of Literature ◽  
Head Blight ◽  
Planting Dates ◽  
Yield Data ◽  
Population Average ◽  
Damage Coefficient ◽  
Serious Disease

AbstractFusarium head blight (FHB), caused by theFusarium graminearumspecies complex, is a serious disease of wheat in Brazil. A review of literature on fungicide efficacy for field trials evaluated in Brazil was conducted to obtain FHB-yield data and explore their relationship. Thirty-seven studies (9 years and 11 locations) met the criteria for inclusion (FHB index ≥ 5% and max-min range ≥ 4 percent points [p.p.]). Studies were group into two production situations: low (Yl≤ 3,631 kg ha−1) or high (Yh> 3,631 kg ha−1) yield, based on the median of maximum yields across trials. Population-average intercepts, but not the slopes, from fitting a random-coefficients model, differed significantly betweenYl(2,883.6 kg ha−1) andYh(4,419.5 kg ha−1). The calculated damage coefficient was 1.05 %−1and 1.60 %−1forYhandYl, respectively. A crop model simulated attainable wheat yields for 10 planting dates within each year during a 28-year period, including prior (1980-1989) and after (1990-2007) FHB resurgence. Simulated losses using disease predictions to penalize yield were in general agreement in magnitude with literature reports, for both periods. Economic analysis for scenarios of variable fungicide costs and wheat prices, and one versus two sprays of tebuconazole, showed that the probability of not-offsetting the costs was higher (> 0.75) prior to FHB resurgence than after the 1990. Our approach may be useful for designing of longlasting, yet profitable, contingency tactics to management FHB in wheat. Currently one spray of triazole fungicide during flowering is more likely a profitable decision than applying two sprays, for which there is greater uncertainty.

Evaluation of Application Timing of Miravis Ace for Control of Fusarium Head Blight in Wheat

2021 ◽  
pp. PHP-01-21-0007-
Author(s):  
Lovepreet Singh ◽  
Taylor Schulden ◽  
Jason P. Wight ◽  
Joseph Crank ◽  
Louis Thorne ◽  
...  
Keyword(s):  
Fusarium Head Blight ◽  
Weather Conditions ◽  
Head Blight ◽  
Flowering Stage ◽  
Technical Problems ◽  
Application Timing ◽  
Significant Control ◽  
Small Window ◽  
Three Stages ◽  
Serious Disease

Fusarium head blight (FHB) is a serious disease of wheat and barley that not only lowers yield but also contaminates the grain with associated mycotoxins such as deoxynivalenol (DON). Chemical control options for FHB and DON include application of triazole fungicides at the anthesis or flowering stage. This presents practical challenges for growers in managing FHB, as the appropriate timing window typically lasts only 3 to 4 days. If this small window is missed, due to weather conditions or technical problems, fungicide application is less effective in controlling FHB and DON. The present work was conducted over 2 years (2019 and 2020) to test the efficacy of a new fungicide (pydiflumetofen + propiconazole) from Syngenta labeled as Miravis Ace in controlling FHB and DON content at 50% head emergence (Feekes 10.3), anthesis (Feekes 10.5.1), and end of flowering (Feekes 10.5.3) stages. Prosaro 421 SC, a standard FHB control triazole fungicide, was used at all three stages for comparison with the test fungicide. Miravis Ace application at 50% head emergence provided significant control over the nontreated check for FHB incidence (2020), FHB severity (2019), and DON content (2019) with control efficacies as high as 51, 69, and 52%, respectively. However, mean control percentages relative to the check were highest with Miravis Ace at anthesis in both 2019 and 2020 for all the FHB parameters. In conclusion, 50% head emergence provides statistically significant control on FHB and DON, but anthesis was the most effective application stage for Miravis Ace.

Impact of the biofungicide tetramycin on the development of Fusarium head blight, grain yield and deoxynivalenol accumulation in wheat

2020 ◽  
Vol 13 (2) ◽  
pp. 235-246
Author(s):  
W.Q. Shi ◽  
L.B. Xiang ◽  
D.Z. Yu ◽  
S.J. Gong ◽  
L.J. Yang
Keyword(s):  
Fusarium Head Blight ◽  
Fusarium Graminearum ◽  
Spore Germination ◽  
Field Experiments ◽  
Synergistic Effects ◽  
Field Trials ◽  
Head Blight ◽  
Mycelium Growth ◽  
Key Aspects

Fusarium graminearum causes Fusarium head blight (FHB), a devastating disease that leads to extensive yield and quality loss in wheat and barley production. Integrated pest management (IPM) is required to control this disease and biofungicides, such as tetramycin, could be a novel addition to IPM strategies. The current study investigated in vitro tetramycin toxicity in Fusarium graminearum and evaluated its effectiveness for the control of Fusarium head blight FHB. Tetramycin was shown to affect three key aspects of Fusarium pathogenicity: spore germination, mycelium growth and deoxynivalenol (DON) production. The in vitro results indicated that tetramycin had strong inhibitory activity on the mycelial growth and spore germination. Field trials indicated that tetramycin treatment resulted in a significant reduction in both the FHB disease index and the level of DON accumulation. The reduced DON content in harvested grain was correlated with the amount of Tri5 mRNA determined by qRT-PCR. Synergistic effects between tetramycin and metconazole, in both the in vitro and field experiments were found. Tetramycin could provide an alternative option to control FHB.

Biological management of Fusarium head blight and mycotoxin contamination in wheat

2009 ◽  
Vol 2 (2) ◽  
pp. 193-201 ◽  
Author(s):  
A. Xue ◽  
H. Voldeng ◽  
M. Savard ◽  
G. Fedak
Keyword(s):  
Fusarium Head Blight ◽  
Field Experiments ◽  
Control Measure ◽  
Field Trials ◽  
Management Program ◽  
Gibberella Zeae ◽  
Head Blight ◽  
Wheat Field ◽  
Mycotoxin Contamination ◽  
Better Than

Fusarium head blight (FHB), caused by Gibberella zeae is a harmful disease of wheat. To manage FHB and mycotoxin contamination in wheat, field experiments were conducted from 2007 to 2008 to evaluate a total of 20 selected bioagents for their ability to inhibit perithecial production of G. zeae and for the control of FHB and deoxynivalenol (DON) contamination, in comparison with the registered fungicide Folicur (tebuconazole). All 20 bioagents significantly reduced the perithecial production compared to the untreated control. Clonostachy rosea strain ACM941 was the most effective treatment, reducing the production of perithecia by 63.7% in 2007 and 67.5% in 2008. These effects were significantly better than Folicur fungicide, which reduced perithecial production by 30.4% and 20.5%, for 2007 and 2008, respectively. When sprayed on to wheat heads, seven of the 20 bioagents significantly reduced the FHB index, one reduced Fusarium damaged kernels (FDK), and six reduced DON content in grains in 2007. ACM941 was the only treatment that significantly reduced FHB index, FDK, and DON, by 46.4%, 29.0% and 28.7%, respectively. Among the six bioagents and three formulated products evaluated in two separate field trials in 2008, ACM941 and its formulated product ACM941-CU were the only treatments that significantly reduced FHB index, FDK, and DON. The treatments reduced FHB index by 30.8% and 31.4%, FDK by 17.8% and 43.8%, and DON by 30.8% and 37.1%, for ACM941 and ACM941-CU, respectively. These effects were less marked than those of the Folicur fungicide that reduced FHB index by 98.8%, FDK by 94.2%, and DON by 92.1%. Results of this study suggest that ACM941 is a promising bioagent against G. zeae and may be used as a control measure in organic farming and in an integrated FHB and DON management program for wheat production.

Comparative yield, disease resistance and response to fungicide for forty-five historic Canadian wheat cultivars

2014 ◽  
Vol 94 (2) ◽  
pp. 371-381 ◽  
Author(s):  
Gary Martens ◽  
Lakhdar Lamari ◽  
Ardelle Grieger ◽  
Robert H. Gulden ◽  
Brent McCallum
Keyword(s):  
Disease Resistance ◽  
Fusarium Head Blight ◽  
Leaf Rust ◽  
Fusarium Head Blight Resistance ◽  
Leaf Rust Resistance ◽  
Field Trials ◽  
Wheat Cultivars ◽  
Head Blight ◽  
Fungicide Application ◽  
Negative Effect

Martens, G., Lamari, L., Grieger, A., Gulden, R. H. and McCallum, B. 2014. Comparative yield, disease resistance and response to fungicide for forty-five historic Canadian wheat cultivars. Can. J. Plant Sci. 94: 371–381. Forty-five historic Canadian spring wheat cultivars, ranging from Red Fife (1870) to modern cultivars, were compared for yield and disease resistance in field trials from 2007 to 2010. A split-plot design was used to test yield, leaf rust and Fusarium head blight resistance, with or without a fungicide application. Older cultivars were generally lower yielding and more leaf rust susceptible than modern cultivars; this difference was greatest in 2007 and 2010 under heavier leaf rust. Response to fungicide application was highest in 2007 and 2010. In 2008, leaf rust was very low, and fungicide application had a slightly negative effect on yield overall. Cultivars that have good leaf rust resistance, such as Pasqua, AC Minto, and 5600 HR, had a negligible response to fungicide, whereas older, susceptible cultivars had a larger response. Fusarium head blight levels were too low to compare the cultivars. The highest-yielding cultivars in the untreated plots were AC Domain, 5500HR, AC Cora, Roblin and Barrie, whereas AC Cora, AC Domain, McKenzie, Roblin and AC Intrepid were the highest yielding in the fungicide-treated plots. AC Domain, AC Barrie and Roblin were among the most popular wheat cultivars in Manitoba, in terms of seeded area from the early 1990s to 2009.

scholarly journals The effects of fungicides on Fusarium spp. and their associated mycotoxins in naturally infected winter wheat grain

2011 ◽  
Vol 64 (1) ◽  
pp. 123-130 ◽  
Author(s):  
Skaidre Suproniene ◽  
Audrone Mankeviciene ◽  
Irena Gaurilcikiene
Keyword(s):  
Winter Wheat ◽  
Fusarium Head Blight ◽  
Untreated Control ◽  
Field Trials ◽  
Fusarium Avenaceum ◽  
Research Centre ◽  
Single Application ◽  
Wheat Grain ◽  
Head Blight ◽  
Fusarium Spp

The effects of fungicides on Fusarium spp. and their associated mycotoxins in naturally infected winter wheat grain Field trials conducted at the Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry (central part of Lithuania) in 2009 were aimed to evaluate the effect of fungicides on Fusarium Head Blight (FHB) in a naturally infected field. A single application of dimoxystrobin + epoxiconazole (Swing Gold), prothioconazole (Proline), metconazole (Juventus), tebuconazole (Folicur), prothioconazole + tebuconazole (Prosaro) was applied to winter wheat cv. ‘Zentos’ at the manufacturer's recommended doses at anthesis (BBCH 65). The FHB incidence and severity were assessed at milk and hard maturity stages. The percentage of Fusarium infected grain and deoxynivalenol (DON), zearalenone (ZEN) and T-2 toxin (T-2) concentrations in harvested grain were determined. In all fungicide treated plots a significant reduction of FHB incidence and severity was determined; however the fungicides did not exert any effect on the amount of Fusarium-infected grain as compared with the untreated control. A reduction of DON, ZEN and T-2 contents in grain was determined in tebuconazole treatments. Fusarium avenaceum (Fr.) Sacc, F. culmorum (W. G. Sm.) Sacc., F. poae (Peck) Wollenw, F. sporotrichioides Sherb. and F. tricinctum (Corda) Sacc were identified in wheat grain, F. poae was prevalent.

scholarly journals The Semidwarfing Alleles Rht-D1b and Rht-B1b Show Marked Differences in Their Associations with Anther-Retention in Wheat Heads and with Fusarium Head Blight Susceptibility

2016 ◽  
Vol 106 (12) ◽  
pp. 1544-1552 ◽  
Author(s):  
Maria Buerstmayr ◽  
Hermann Buerstmayr
Keyword(s):  
Fusarium Head Blight ◽  
Plant Height ◽  
Fusarium Graminearum ◽  
Hyphal Growth ◽  
Field Trials ◽  
Wheat Breeding ◽  
Head Blight ◽  
Backcross Population ◽  
Reduced Height ◽  
Haploid Population

The semidwarfing alleles reduced height (Rht)-D1b and Rht-B1b are widely deployed in wheat breeding. Both alleles have similar effects on plant height but differ in their effect on Fusarium head blight (FHB) severity. A double-haploid population and a backcross population, segregating for Rht-B1a/Rht-B1b and Rht-D1a/Rht-D1b, were evaluated for FHB severity, plant height, and anther retention in field trials in three consecutive years. The semidwarfing alleles reduced plant height and increased the proportion of retained anthers. Reduced plant height and a high proportion of retained anthers were associated with increased FHB severity. The Rht-D1b allele had a significantly greater impact on anther retention and FHB severity than the Rht-B1b allele. Fusarium graminearum establishes infection sites predominantly inside the floral cavity and retained anthers potentially support colonization and initial hyphal growth, leading to a higher disease level in genotypes with a higher proportion of retained anthers. This is the first report demonstrating that differences in disease severity associated with Rht-D1b and Rht-B1b can be partly explained by their different effect on the extent of anther retention.

scholarly journals Modeling Yield Losses and Fungicide Profitability for Managing Fusarium Head Blight in Brazilian Spring Wheat

2020 ◽  
Vol 110 (2) ◽  
pp. 370-378
Author(s):  
Maíra Rodrigues Duffeck ◽  
Kaique dos Santos Alves ◽  
Franklin Jackson Machado ◽  
Paul David Esker ◽  
Emerson Medeiros Del Ponte
Keyword(s):  
Fusarium Head Blight ◽  
Disease Model ◽  
Wheat Yield ◽  
Quality Parameters ◽  
Control Measures ◽  
Wheat Crop ◽  
Yield Losses ◽  
Head Blight ◽  
Yield Data ◽  
Profitability Analysis

Fusarium head blight (FHB) and wheat yield data were gathered from fungicide trials to explore their relationship. Thirty-seven studies over 9 years and 11 locations met the criteria for inclusion in the analysis: FHB index in the untreated check ≥ 5% and the range of index in a trial ≥ 4 percentage points. These studies were grouped into two baseline yields, low (Yl ≤ 3,631 kg ha−1) or high (Yh > 3,631 kg ha−1), defined based on the median of maximum yields across trials. Attainable (disease-free) yields and FHB index were predicted using a wheat crop and a disease model, respectively, in 280 simulated trials (10 planting dates in a 28-year period, 1980 to 2007) for the Passo Fundo location. The damage coefficient was then used to calculate FHB-induced yield loss (penalizing attainable yield) for each experiment. Losses were compared between periods defined as before and after FHB resurge during the early 1990s. Disease reduction from the use of one or two sprays of a triazole fungicide (tebuconazole) was also simulated, based on previous meta-analytic estimates, and the response in yield was used in a profitability analysis. Population-average intercepts but not the slopes differed significantly between Yl (2,883.6 kg ha−1) and Yh (4,419.5 kg ha−1) baseline yields and the damage coefficients were 1.60%−1 and 1.05%−1, respectively. The magnitudes and trends of simulated yield losses were in general agreement with literature reports. The risk of not offsetting the costs of one or two fungicide sprays was generally higher (>0.75) prior to FHB resurgence but fungicide profitability tended to increase in recent years, depending on the year. Our simulations allowed us to reproduce trends in historical losses, and may be further adjusted to test the effect and profitability of different control measures (host resistance, other fungicides, etc.) on quality parameters such as test weight and mycotoxin contamination, should the information become available.

Identification of novel QTL for resistance to Fusarium head blight in a tetraploid wheat population

Genome ◽  
2012 ◽  
Vol 55 (12) ◽  
pp. 853-864 ◽  
Author(s):  
Yuefeng Ruan ◽  
André Comeau ◽  
François Langevin ◽  
Pierre Hucl ◽  
John M. Clarke ◽  
...  
Keyword(s):  
Durum Wheat ◽  
Fusarium Head Blight ◽  
Fusarium Graminearum ◽  
Triticum Turgidum ◽  
Tetraploid Wheat ◽  
Field Trials ◽  
Gibberella Zeae ◽  
Head Blight ◽  
Wheat Population ◽  
Fhb Resistance

Most tetraploid durum wheat (Triticum turgidum L var. durum) cultivars are susceptible to Fusarium head blight (FHB). This study reports novel quantitative trait loci (QTL) associated with FHB resistance. A backcross recombinant inbred line (BCRIL) population was developed from the cross BGRC3487/2*DT735, and 160 lines were evaluated for resistance to Fusarium graminearum Schwabe (teleomorph Gibberella zeae (Schwein. Petch) in field trials over 3 years (2008–2010) and to a F. graminearum 3-acetyl-deoxynivalenol (3-ADON) chemotype in greenhouse trials. The population was genotyped with 948 polymorphic loci using DArT and microsatellite markers. Eleven QTL were associated with FHB resistance under field conditions on chromosomes 2A, 3B, 5A, 5B, 7A, and 7B. Two of these, QFhb.usw-3B from BGRC3487 and QFhb.usw-7A2, were consistently detected over environments. The QFhb.usw-3B QTL was in a similar position to a resistance QTL in hexaploid wheat. The combination of the two QTL reduced field index by 53.5%–86.2%. Two QTL for resistance to the 3-ADON chemotype were detected on chromosomes 1B and 4B. Both BGRC3487 and DT735 could provide new sources of FHB resistance and the combination of QTL reported here could be valuable tools in breeding FHB-resistant durum wheat.

Efficacy Assessment of a New Fungicide, Miravis Ace, for Control of Fusarium Head Blight in Wheat

2020 ◽  
Vol 21 (4) ◽  
pp. 365-368
Author(s):  
Lovepreet Singh ◽  
Jason P. Wight ◽  
Joseph Crank ◽  
Louis Thorne ◽  
Yanhong Dong ◽  
...  
Keyword(s):  
Fusarium Head Blight ◽  
Genetic Resistance ◽  
Single Mode ◽  
Weather Conditions ◽  
Economic Losses ◽  
Head Blight ◽  
Efficacy Assessment ◽  
Serious Disease ◽  
Pathogen Populations ◽  
Succinate Dehydrogenase Inhibitor

Fusarium head blight (FHB) is a serious disease of wheat and barley that leads to significant economic losses and deteriorated grain quality because of the associated mycotoxins. Genetic resistance and use of fungicides are the methods used to control FHB. However, in weather conditions conducive for FHB epidemics, higher levels of genetic resistance as well as greater efficacy of fungicides are required to adequately control this disease. Due to the extensive use of a single mode of action for management of FHB, there is a need to diversify fungicides used to lower the risk of resistance development in pathogen populations. In this 2-year study, we evaluated the performance of a new fungicide, Miravis Ace (a proprietary mix of pydiflumetofen and propiconazole active ingredients produced by Syngenta) for controlling FHB. It is a mix of succinate dehydrogenase inhibitor and demethylation inhibitor fungicides and can add diversity to the fungicide toolkit for FHB management. The level of control of FHB and deoxynivalenol (DON) achieved by spraying Miravis Ace at anthesis (Feekes growth stage 10.5.1) was found to be equivalent to that provided by the currently recommended products for managing FHB and reducing DON in wheat and barley.

scholarly journals A risk infection simulation model for fusarium head blight of wheat

2005 ◽  
Vol 30 (6) ◽  
pp. 634-642 ◽  
Author(s):  
Emerson M. Del Ponte ◽  
José Maurício C. Fernandes ◽  
Willingthon Pavan
Keyword(s):  
Fusarium Head Blight ◽  
Mechanistic Model ◽  
Disease Incidence ◽  
Host Susceptibility ◽  
Infection Frequency ◽  
Head Blight ◽  
Planting Dates ◽  
Airborne Inoculum ◽  
Infection Index ◽  
Cloud Density

Fusarium Head Blight (FHB) is a disease of great concern in wheat (Triticum aestivum). Due to its relatively narrow susceptible phase and environmental dependence, the pathosystem is suitable for modeling. In the present work, a mechanistic model for estimating an infection index of FHB was developed. The model is process-based driven by rates, rules and coefficients for estimating the dynamics of flowering, airborne inoculum density and infection frequency. The latter is a function of temperature during an infection event (IE), which is defined based on a combination of daily records of precipitation and mean relative humidity. The daily infection index is the product of the daily proportion of susceptible tissue available, infection frequency and spore cloud density. The model was evaluated with an independent dataset of epidemics recorded in experimental plots (five years and three planting dates) at Passo Fundo, Brazil. Four models that use different factors were tested, and results showed all were able to explain variation for disease incidence and severity. A model that uses a correction factor for extending host susceptibility and daily spore cloud density to account for post-flowering infections was the most accurate explaining 93% of the variation in disease severity and 69% of disease incidence according to regression analysis.

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