Integrated strategies for Fusarium head blight management in the United States

McMullen, Marcia; Halley, Scott; Schatz, Blaine; Meyer, Scott; Jordahl, James G.; Ransom, Joel K.

doi:10.1556/crc.36.2008.suppl.b.45

Cited by 50 publications

(48 citation statements)

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“…prothioconazole application at anthesis (MR_TR) over resistance alone (MR_UT) and fungicide treatment alone (S_TR), and the superior efficacy of moderate resistance alone (MR_UT) over fungicide alone (S_TR) against DON, were consistent with results from some other studies conducted across fewer environments and wheat classes (1,22,43). This is not surprising because, by definition, the moderately resistant cultivars would be expected to have lower levels of index and DON than the untreated susceptible check, and treating these cultivars with a fungicide would be expected to reduce disease and toxin levels even further relative to S_UT.…”

Section: Discussionsupporting

confidence: 77%

“…Integrated management of FHB is often recommended as the most effective strategy for minimizing losses due to FHB and DON (22). In general, combining an appropriately timed fungicide application with a moderately resistant cultivar usually results in the greatest reductions in disease intensity and toxin accumulation (46).…”

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confidence: 99%

“…Year-to-year or location-to-location variations among studies conducted using the same cultivar-fungicide combinations provide circumstantial evidence that fungicide-environment and genotypeenvironment interactions may affect the magnitude of disease and DON reductions or the relative effect of different combinations of cultivar resistance and fungicide treatment (1,22,(43)(44)(45)(46). Understanding the efficacy and stability of integrating cultivar resistance and fungicide treatment across environments is vital for making general best-management recommendations to growers.…”

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confidence: 99%

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Efficacy and Stability of Integrating Fungicide and Cultivar Resistance to Manage Fusarium Head Blight and Deoxynivalenol in Wheat

et al. 2012

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Willyerd, K. T., Li, C., Madden, L. V., Bradley, C. A., Bergstrom, G. C., Sweets, L. E., McMullen, M., Ransom, J. K., Grybauskas, A., Osborne, L., Wegulo, S. N., Hershman, D. E., Wise, K., Bockus, W. W., Groth, D., Dill-Macky, R., Milus, E., Esker, P. D., Waxman, K. D., Adee, E. A., Ebelhar, S. E., Young, B. G., and Paul, P. A. 2012 [MR_UT]) were used in multivariate meta-analyses, and mean log response ratios across trials were estimated and transformed to estimate mean percent control ( C ) due to the management combinations relative to S_UT. All combinations led to a significant reduction in index and DON (P < 0.001). MR_TR was the most effective combination, with a C of 76% for index and 71% for DON, followed by MS_TR (71 and 58%, respectively), MR_UT (54 and 51%, respectively), S_TR (53 and 39%, respectively), and MS_UT (43 and 30%, respectively). Calculations based on the principle of treatment independence showed that the combination of fungicide application and resistance was additive in terms of percent control for index and DON. Management combinations were ranked based on percent control relative to S_UT within each trial, and nonparametric analyses were performed to determine management combination stability across environments (trials) using the Kendall coefficient of concordance (W). There was a significant concordance of management combinations for both index and DON (P < 0.001), indicating a nonrandom ranking across environments and relatively low variability in the within-environment ranking of management combinations. MR_TR had the highest mean rank (best control relative to S_UT) and was one of the most stable management combinations across environments, with low rank stability variance (0.99 for index and 0.67 for DON). MS_UT had the lowest mean rank (poorest control) but was also one of the most stable management combinations. Based on Piepho's nonparametric rank-based variance homogeneity U test, there was an interaction of management combination and environment for index (P = 0.011) but not for DON (P = 0.147), indicating that the rank ordering for index depended somewhat on environment. In conclusion, although the magnitude of percent control will likely vary among environments, integrating a single tebuconazole + prothioconazole application at anthesis with cultivar resistance will be a more effective and stable management practice for both index and DON than either approach used alone.

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Section: Discussionsupporting

confidence: 77%

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confidence: 99%

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confidence: 99%

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Efficacy and Stability of Integrating Fungicide and Cultivar Resistance to Manage Fusarium Head Blight and Deoxynivalenol in Wheat

et al. 2012

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“…The cited authors demonstrated that DON biosynthesis was nearly completely inhibited in the grain of wheat cultivars characterized by increased resistance to FHB. In a study by McMullen et al (2008), the use of triazole fungicides contributed to a two-fold reduction in DON accumulation in grain, but only in treatments where crops were grown after oilseed rape and not wheat. According to Willyerd et al (2012), a combination of fungicides and moderately-resistant wheat cultivars offered the most effective protection against FHB.…”

Section: Introductionmentioning

confidence: 98%

Fusarium Head Blight and Mycotoxin Concentrations in a Moderately Resistant Winter Wheat Cultivar Under Different Nutrient Regimes

Sobieraj

Cwalina-Ambroziak

WaÅ›kiewicz³

et al. 2017

JAA

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I S S N 2349-0837 V o l u m e 7 N u m b e r 3 J o u r n a l o f A d v a n c e s i n A g r i c u l t u r e 1083 | P a g e h t t p s : / / c i r w o r l d . c o m S e p t e m b e r , 2 0 1 7 ABSTRACTWinter wheat cv. Boomer was grown in a field-plot experiment in Tomaszkowo near Olsztyn. During the growing season, the severity of Fusarium head blight (FHB was evaluated on a 5-point scale. The quantitative and qualitative composition of Fusarium fungi colonizing wheat grain was evaluated in a laboratory. The content of Fusarium mycotoxins (deoxynivalenol, DON, nivalenol, NIV, zearalenone, ZEA, fumonisins FB1 and FB2) and ergosterol (ERG) in grain was determined by high-performance liquid chromatography (HPLC). The relationships between the severity of FHB and mycotoxin concentrations in grain were determined by calculating Pearson's correlation coefficient r in the CORR SAS procedure. The effect of microelement fertilizers on the severity of FHB, the species composition of Fusarium fungi colonizing winter wheat grains and mycotoxin concentrations in grain were determined.Analyses of winter wheat spikes revealed that FHB was less severe in 2012 (healthy ears in the NPK+Mn treatment and the lowest value of the infection index 1% was noted in the absolute control treatment) than in 2013 (the most evident symptoms of FHB in the NPK+Nano-Gro treatment -infection index of approx. 12%). Mineral fertilization, i.e. NPK, NPK with microelements (Cu, Zn, Mn) and NPK with the Nano-Gro® organic growth stimulator, reduced the production of trichothecenes, ZEA and fumonisins B1 and B2 in both years of the study. The highest levels of DON and NIV were noted in winter wheat grain in 2012 in control, control/NPK, NPK+Cu and NPK+Mn treatments. Toxin-producing fungi: Fusarium culmorum, F. poae, Gibberella avenacea, G. zeae were isolated most frequently from winter wheat grain in the above treatments. The severity of FHB was not significantly correlated with the concentrations of ERG, FB1, FB2 and ZEA in grain. A negative correlation was observed between the severity of FHB vs. DON and NIV levels in grain.

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“…Though FHB disease outbreaks cannot be prevented, lower disease severity, lower DON contaminations and higher yields can be achieved with a combination of intensive tillage, the most resistant cultivars, avoiding consecutive wheat or maize rotations and the application of azole fungicides at the right timing (Beyer et al, 2006;McMullen et al, 2008). Growers have to avoid using fields in which wheat had been planted the previous two years, because these contain increased F. graminearum inoculum levels (Guo et al, 2010), as the fungus survives the winter on the crop residues left in the fields.…”

Section: Fields Of Research (For) Classificationmentioning

confidence: 99%

Regulation and cell biology of secondary metabolite production in Fusarium graminearum and Fusarium pseudograminearum

Blum¹

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1 AbstractAscomycete fungi have the potential to produce a vast array of secondary metabolites, which are metabolites not required for normal growth and development. In any one species there is typically the potential for production of upward of fifty of these compounds. Many fungal secondary metabolites are used as medicines (e.g. penicillin or cyclosporine), or are of importance due to their toxicity in humans or animals (e.g. aflatoxins), or because they are virulence factors during crop plant infection (e.g. deoxynivalenol). Despite the vast potential encoded in ascomycete genomes, the vast majority of fungal secondary metabolites are yet to be discovered. This is in part due to our lack of understanding of how the production of these compounds is regulated. Moreover, even for the compounds we do know, we are just beginning to understand the complex interaction of external stimuli, signalling pathways, cellular and developmental biology that leads to their production. In this thesis, biological insights into these aspects of two fungal secondary metabolites, deoxynivalenol (DON) and fusatin are provided.In chapter II a high-throughput fluorescence activated cell sorting (FACS) based mutant screen was developed and the regulation of DON production in Fusarium graminearum was analysed. DON is an economically very important mycotoxin, as it is the most common contaminant of wheat, barley and corn worldwide. It is produced by plant pathogenic filamentous fungi of the Fusarium family, which can cause Fusarium head blight as well as Fusarium crown rot. During plant infection, DON is an important virulence factor and it can be toxic for humans and animals. The regulation of DON production is not yet fully understood. To identify regulators, a mutant screen was developed using FACS to allow high throughput screening, coupled with whole genome sequencing to identify mutations.Segregation analyses were performed to determine the mutation causing the phenotype.The mutant screen identified an adenylyl cyclase allele, which resulted in production of DON under normally repressive conditions. In addition, the mutant developed cellular structures associated with toxin production under repressive conditions. The levels of the fundamental second messenger cAMP, which adenylyl cyclases produce, were increased in the identified mutant, suggesting it might be a gain-of-function adenylyl cyclase mutant. This mutant screening methodology can be adapted to identify regulators of different secondary metabolites as well as to identify mutants overproducing yet unknown secondary metabolites. Abstract 2In chapter III the cell biology of DON production in Fusarium graminearum was elucidated with quantitative super resolution microscopy. During the last five years the first insights into the cell biology of DON production were gained, indicating complex cell biological mechanisms. During toxin production, F. graminearum develops endoplasmic reticulum proliferations, called toxisomes, at which two DON biosynthesis enzymes, TRI1 a...

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Integrated strategies for Fusarium head blight management in the United States

Cited by 50 publications

References 9 publications

Efficacy and Stability of Integrating Fungicide and Cultivar Resistance to Manage Fusarium Head Blight and Deoxynivalenol in Wheat

Efficacy and Stability of Integrating Fungicide and Cultivar Resistance to Manage Fusarium Head Blight and Deoxynivalenol in Wheat

Fusarium Head Blight and Mycotoxin Concentrations in a Moderately Resistant Winter Wheat Cultivar Under Different Nutrient Regimes

Regulation and cell biology of secondary metabolite production in Fusarium graminearum and Fusarium pseudograminearum

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