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D'Angelo MS Thesis.pdf (359.6 KB)

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Effects of Fungicide Chemistry and Application Timing on Fusarium Head Blight and Deoxynivalenol in Soft Red Winter Wheat

D'Angelo, Daisy L
http://rave.ohiolink.edu/etdc/view?acc_num=osu1386024180

Abstract Details

2013, Master of Science, Ohio State University, Food, Agricultural and Biological Engineering.
Demethylation Inhibitors (DMI) and Quinone Outside Inhibitors fungicides are important components of wheat disease management programs. However, only members of former group are usually recommended for the control of Fusarium head blight (FHB) and deoxynivalenol (DON). Since wet, humid conditions during anthesis and early grain fill are highly conducive to FHB development, DMI fungicides are commonly recommended for FHB management when anthesis coincides with wet weather. However, there are several practical limitations to applying a fungicide at anthesis. Research is needed to determine whether applications made after anthesis will provide adequate control of this disease and its associated toxins in soft red winter wheat under field conditions in the U.S. Midwest. In the case of the QoI, these are not usually recommended to FHB and DON management because some members of this group have been reported to increase instead of decrease DON in harvested grain. However, it is unclear whether all QoIs affect DON in the same manner and whether DON response to QoIs vary with application timing. The objectives of this study were to: 1) determine the effect of post-anthesis applications of 19% tebuconazole + 19% prothioconazole and 8.6% metconazole on FHB and DON in soft red winter wheat (SRWW) under different naturally infected and artificially inoculated field conditions, 2) determine whether the magnitude of FHB and DON responses to post-anthesis fungicide applications varied with active ingredient, cultivar, and baseline disease and toxin levels, and 3) estimate the efficacy (based on mean percent control of FHB index and DON) of post-anthesis treatments relative to untreated and anthesis reference treatments.; 4) determine the effects of two QoI active ingredients (22.9% azoxystrobin and 23.6% pyraclostrobin), relative to untreated checks and DMI (19% tebuconazole + 19% prothioconazole) reference treatments, on DON contamination of wheat grain and spikes; 5) determine whether the effect of QoIs on FHB index and DON was influenced by application timing; and 6) determine whether the relationships among index, DON, and Fusarium damaged kernels varied with active ingredient and application timing.
Pierce Paul (Advisor)
Laurence Madden (Committee Member)
Michael Ellis (Committee Member)
103 p.
Plant Pathology

Recommended Citations

Citations

  • D'Angelo, D. L. (2013). Effects of Fungicide Chemistry and Application Timing on Fusarium Head Blight and Deoxynivalenol in Soft Red Winter Wheat [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1386024180

    APA Style (7th edition)

  • D'Angelo, Daisy. Effects of Fungicide Chemistry and Application Timing on Fusarium Head Blight and Deoxynivalenol in Soft Red Winter Wheat. 2013. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1386024180.

    MLA Style (8th edition)

  • D'Angelo, Daisy. "Effects of Fungicide Chemistry and Application Timing on Fusarium Head Blight and Deoxynivalenol in Soft Red Winter Wheat." Master's thesis, Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1386024180

    Chicago Manual of Style (17th edition)

osu1386024180
1,391
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This open access ETD is published by The Ohio State University and OhioLINK.