2019: Evaluate Miravis Ace Efficacy at Different Timing Applications to Manage Fusarium Head Blight in Hard Red Spring Wheat
(Research Report, Langdon REC, December 2019)Objectives:
1. Evaluate Miravis Ace vs Prosaro on Fusarium head blight (FHB) in hard red spring wheat (HRSW).
2. Evaluate Miravis Ace efficacy at different timings.
Methods:
Location: NDSU Langdon Research Extension Center
Experimental design: Randomized complete block, replicated four times.
Previous crop: Canola
Cultivars of HRSW tested: WB Mayville
Planting: 1.5 million pure live seeds/A planted on May 9, 2019. A border plot was planted between treated plots to minimize interference from spray drift.
Plot size: Seven rows at six inch spacing, 5 ft. x 20 ft., mowed back to 5 ft. x 16 ft.
Herbicides applied: Axial XL (16.4 Fl. oz/A) + Huskie (15 Fl. oz/A) + Prowl H2O (36 Fl. oz/A)
Inoculation: Plots were inoculated by spreading corn spawn inoculum at around boot stage (Feekes 9-10) at the rate of 300 g/plot.
Disease development: Supplemental moisture was provided by running overhead irrigation from Feekes 9 to 11.2.5 at the rate of one hour per day to create a conducive environment for FHB development.
Fungicide treatments: Fungicides were applied with a CO2-pressurized backpack sprayer with a three nozzle boom (XR-8002) and the water volume used was 20 GPA. Fungicide (Miravis Ace) application was made at full head emergence on July 3rd. Miravis Ace, Prosaro and Caramba were applied at Feekes 10.5.1(anthesis) on July 5th and repeated 5 days after the first spray (July 10th) based on protocol recommendations. Refer to Table 1 for the treatments, dosages and application timings.
Disease assessment: Data on FHB incidence was obtained by counting the number of heads showing FHB symptoms out of 50 heads. FHB head severity was rated using 0-100% scale on arbitrary 50 heads, excluding two outer rows. FHB index (Index) was calculated using formula: Index = (SEV*INC)/100.
Harvest: Plots were harvested on September 4th with a small plot combine and the yield was determined at 13.5% moisture.
Data analysis: Statistical analysis was done using Agrobase. Fisher’s least significant difference (LSD) was used to compare means at p (α = 0.05). Actual means were presented in the table for simplicity of understanding.
Table 1: Efficacy of Miravis Ace at various application timings in comparison to commercial fungicides to manage Fusarium Head Blight on Hard Red Spring Wheat.
* Indicates treatments are statistically significant.
Note: All treatments were applied with NIS @ 0.125 v/v.
Results: Treatments of Miravis Ace applied at full head emergence and at anthesis resulted in equal performance on managing Fusarium head blight. However, Miravis Ace applied at 3-7 days after anthesis was the best performer of the parameters tested such as FHB Index, DON content and yield in this research trial (Table 1).
Funded by: US Barley and Wheat Scab Initiative Project and Syngenta.
