Efficacy and stability of integrating fungicide and cultivar resistance to manage Fusarium head blight and deoxynivalenol in wheat

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dc.contributor.author Willyerd, K. T.
dc.contributor.author Li, C.
dc.contributor.author Madden, L. V.
dc.contributor.author Bradley, C. A.
dc.contributor.author Bergstrom, G. C.
dc.contributor.author Sweets, L. E.
dc.contributor.author McMullen, M.
dc.contributor.author Ransom, J. K.
dc.contributor.author Grybauskas, A.
dc.contributor.author Osborne, L.
dc.contributor.author Wegulo, S. N.
dc.contributor.author Hershman, D. E.
dc.contributor.author Wise, K.
dc.contributor.author Bockus, William W.
dc.contributor.author Groth, D.
dc.contributor.author Dill-Macky, R.
dc.contributor.author Milus, E.
dc.contributor.author Esker, P. D.
dc.contributor.author Waxman, K. D.
dc.contributor.author Adee, E. A.
dc.contributor.author Ebelhar, S. E.
dc.contributor.author Young, B. G.
dc.contributor.author Paul, P. A.
dc.date.accessioned 2012-08-01T20:08:22Z
dc.date.available 2012-08-01T20:08:22Z
dc.date.issued 2012-08-01
dc.identifier.uri http://hdl.handle.net/2097/14117
dc.description.abstract Integration of host resistance and prothioconazole + tebuconazole fungicide application at anthesis to manage Fusarium head blight (FHB) and deoxynivalenol (DON) in wheat was evaluated using data from over 40 trials in 12 U.S. states. Means of FHB index (index) and DON from up to six resistance class–fungicide management combinations per trial (susceptible treated [S_TR] and untreated [S_UT]; moderately susceptible treated [MS_TR] and untreated [MS_UT]; moderately resistant treated [MR_TR] and untreated [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 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. en_US
dc.relation.uri http://apsjournals.apsnet.org/doi/abs/10.1094/PDIS-09-11-0763 en_US
dc.subject Fusarium head blight en_US
dc.subject Deoxynivalenol en_US
dc.subject Wheat en_US
dc.subject Host resistance en_US
dc.subject Fungicide en_US
dc.title Efficacy and stability of integrating fungicide and cultivar resistance to manage Fusarium head blight and deoxynivalenol in wheat en_US
dc.type Article (publisher version) en_US
dc.date.published 2012 en_US
dc.citation.doi doi:10.1094/PDIS-09-11-0763 en_US
dc.citation.epage 967 en_US
dc.citation.issue 7 en_US
dc.citation.jtitle Plant Disease en_US
dc.citation.spage 957 en_US
dc.citation.volume 96 en_US
dc.contributor.authoreid bockus en_US

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