Objective: Evaluate various fungicides for their efficacy on barley to manage Fusarium head blight (FHB).
Methods:
Location: NDSU Langdon Research Extension Center
Experimental design: Randomized complete block, replicated four times.
Previous crop: Canola
Cultivar of barley on which the treatments were tested: Tradition
Planting: 1.25 million pure live seeds/A planted on May 8, 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. Application timings: Sprayed at Feekes 10.5.1 stage repeated in treatment of Prosaro after 4-5 days of first spray. Likewise, Proline was sprayed after 4-5 days of first spray.
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 August 19th 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.
Results: Treatments of fungicides applied at different timings resulted in equal performance on managing Fusarium head blight (FHB); Prosaro applied at “Full head emergence” stage was the best treatment of the parameters tested in this research trial (Table 1).
Funded By: Bayer CropScience
Please see the supporting table with data in the attached pdf at the top of this page.
