USWBSI Abstract Viewer

2021 National Fusarium Head Blight Forum


FHB Management (MGMT)

Poster # 109

The Impact of Row Spacing, Seeding Rate, and Fungicide Timing on Leaf Disease and Fusarium Damaged Kernel Severity, Deoxynivalenol, and Productivity of Spring Wheat

Authors & Affiliations:

T.K. Turkington1, H. Klein-Gebbinck2, K. Xi3, B. Beres4, R. Aboukhaddour4, Prabhath Lokuruge5, A. Mulenga5, G. Peng6, W. May7, R. Mohr8, G. Telmosse9, D. Pageau9, A. Foster10, B. Blackwell11, H. Kubota1, B. Tidemann1, and G. Semach2
(1) Lacombe Research and Development Center, Agriculture and Agri-Food Canada, Lacombe, AB T4L 1W1, Canada (2) Beaverlodge Research Farm, Agriculture and Agri-Food Canada, Beaverlodge, AB T0H 0C0, Canada (3) Field Crop Development Centre, Olds College, Lacombe, AB T4L 1W8, Canada (4) Lethbridge Research and Development Center, Agriculture and Agri-Food Canada, Lethbridge, AB T1J 4B1, Canada (5) Scott Research Farm, Agriculture and Agri-Food Canada, Scott, SK S0K 4A0, Canada (6) Saskatoon Research and Development Centre, Agriculture and Agri-Food Canada, Saskatoon, SK S7N 0X2, Canada (7) Indian Head Research Farm, Agriculture and Agri-Food Canada, Indian Head, SK S0G 2K0, Canada (8) Brandon Research and Development Center, Agriculture and Agri-Food Canada, Brandon, MB R7A 5Y3, Canada (9) Normandin Experimental Farm, Agriculture and Agri-Food Canada, Normandin, QC G8M 4K3, Canada (10) Crops and Livestock Research Centre, Agriculture and Agri-Food Canada, Charlottetown, PEI C1A 4N6, Canada (11) Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada

Corresponding Author:

Thomas Turkington
Agriculture and Agri-Food Canada, Lacombe Research and Development Centre
kelly.turkington@agr.gc.ca

Abstract:

The impact of row spacing, seeding rate, and fungicide timing were assessed at seven Canadian spring wheat sites in 2019.  Narrow and wide row spacings (RS) were only set up at four sites.  Seeding rates (SR) of 200 and 400 seeds m-2 were used, while fungicide (Prosaro XTR) timings included: check no treatment; at the start of anthesis (early); a late application date 7-10 days after the start of anthesis (late); and a dual early and late application.  Leaf spot levels were low at four sites, while low to moderate levels occurred at the remaining three sites.  Overall in 2019, RS and its interaction with other factors generally had limited impacts on disease, crop productivity and kernel quality.  Seeding rate and fungicide tended to have the most frequent impacts on leaf disease and crop productivity.  Higher seeding rates (SR) at two of seven sites increased leaf spot severity.  Seeding rate also impacted yield, and thousand kernel weight (TKW) at four and three sites, respectively.  Yield was increased with increased SR at three sites and decreased at one site.  By increasing the seeding rate TKW was decreased at two sites, but increased at the other.  In 2019, fungicide timing impacted leaf disease and yield at three and two sites, respectively.  Here the lowest leaf disease levels were similar for all fungicide treatments, while the highest yields occurred for early and dual applications.  Fusarium damaged kernel severity was decreased by the increased seeding rate at one site only.  Elevated deoxynivalenol (DON) levels only occurred at one site and were significantly impacted by RS, the interaction of RS and SR, and fungicide timing.  At this one site DON was decreased with increased RS and SR, although there was an interaction whereby SR differences were only significant for the narrow RS.  These observed impacts were likely due to more head emergence variability and perhaps a wider window for infection.  Fungicide timing impacted fusarium damaged kernel severity at three sites and DON levels at one site.  Overall, FDK and DON levels were generally lowest for the dual application treatment, intermediate for single early or late applications and highest for the check.  Although dual post-head emergence applications did impact some parameters this treatment may be less economical, while also not being registered for use in Canada.  The funding of the Canadian Agricultural Partnership Canadian National Wheat Cluster and Prairie producer/industry groups is graciously acknowledged.

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