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eturn to table of

eturn to table of contents PERFORMANCE OF SOYBEAN SEED TREATMENTS AGAINST SDS AND SCN IN ON-FARM TRIALS by Keith O’Bryan, Ph.D., Agronomy Research Manager - Seed Treatments, and Meredith Burnison, Agronomy Data Management Specialist OBJECTIVES • In 2015, DuPont Pioneer researchers conducted on-farm trials evaluating the performance of soybean seed treatments across a broad range of environments, including locations with sudden death syndrome (SDS), soybean cyst nematode (SCN), or early-season stress. • ILeVO ® fungicide/nematicide seed treatment (active ingredient: fluopyram) provides protection of soybean seedlings from Fusarium virguliforme infection, the causal agent of sudden death syndrome. ILeVO fungicide seed treatment also has activity against SCN. STUDY DESCRIPTION Year: 2015 Locations: Plot Design: Seed Treatments: 193 on-farm trials 2 replications per treatment at each on-farm location 1. FST + IST: Standard fungicide seed treatment (FST) + insecticide seed treatment (IST)* 2. FST + IST + ILeVO fungicide: FST + IST + ILeVO FST/ NST (1.18 fl oz/140k unit) *FST = EverGol ® Energy fungicide + Allegiance ® fungicide; IST = Gaucho ® insecticide PPST 34.1 bu/acre Trial location near Utica, NE, showing differences in SDS symptoms among seed treatments on an SDS-susceptible (left) and resistant (right) soybean variety, August 2015. SITE CHARACTERIZATION • On-farm research locations were characterized and results analyzed according to SDS and SCN pressure. • SCN pressure groupings: »» High = SCN > 450 eggs/100 cc of soil »» Low = SCN < 450 eggs/100 cc of soil PPST 48.6 bu/acre PPST + ILeVO fungicide 50.9 bu/acre PPST + ILeVO fungicide 63.4 bu/acre Variety A (SDS = 3) Variety B (SDS = 6) RESULTS • Soybeans treated with FST + IST + ILeVO fungicide produced significantly higher grain yield than FST + IST (4.9 bu/acre) in high SCN environments compared to 1.8 bu/acre in low SCN environments. • In moderate SDS environments, the addition of ILeVO fungicide increased grain yield 4.5 bu/ acre over the FST + IST check. Soybean Yield (bu/acre) 70 65 60 55 50 a 63.4 a 64.8 FST + IST b 52.1 FST + IST + ILeVO fungicide a a 65.6 63.8 a 57.0 b 64.4 a 68.9 Means within a group designated with the same letter do not significantly differ at α = 0.10 45 All Loc, n = 193 High SCN, n = 30 Low SCN, n = 82 Mod SDS, n = 85 154

eturn to table of contents WHEAT YIELD RESPONSE TO NITROGEN RATE by Kirk Reese, Agronomy Research Manager OBJECTIVES • Measure grain yield, moisture, test weight, and lodging of selected Pioneer ® brand soft red winter wheat varieties to increasing nitrogen (N) rates. • Determine optimum N rate influence on agronomic maximum yield and N rate by variety interactions. 0 lbs N 40 lbs N 80 lbs N STUDY DESCRIPTION Locations: 6 locations in IL, IN, MI, and OH »» Odin, IL (SO IL) » Belleville, IL (SIU) »» Princeton, IN (SO IN) » Windfall, IN (C IN) »» Blissfield, MI (SE MI) » Deshler, OH (NW OH) Factors: Wheat Variety »» 25R39 » 25R61 » 25R74 » 25R77 Nitrogen Rate »» 0, 40, 80, 120, 160, and 200 lbs N/acre • Treatments were arranged in a two way factorial design with N rate as the main plot and variety as the sub plot with three replications. The SIU location had five replicates. 120 120 lbs N 160 lbs N 200 lbs N Images of Pioneer ® variety 25R77 with different N rates (lbs N/acre). RESULTS • Yield averaged over 92 bu/acre among all varieties, N rates, and locations in this 2015 to 2016 trial. • Grain moisture averaged 12.4% and was not different among locations, N rates, and varieties. • Grain test weight averaged 55.8 lbs/bu and was not different among locations, N rates, and varieties. • Lodging varied among locations; however, there was no significant difference in lodging among N rates, which may be partially explained by above average yield levels. Grain Yield (bu/acre) 110 100 90 80 70 60 0 50 100 150 200 N Rate (lbs/acre) 25R39 25R61 25R74 25R77 Figure 1. Yield by variety and N rate averaged across all 6 locations. • Although yield varied among tested varieties when averaged across locations, yield was optimized at 120 lbs N/acre (Figure 1). • All tested varieties responded similarly in yield with increasing N rate; there was no significant variety by N rate interaction (Figure 1). 155

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