Evaluation of Fungicide Efficacy on Sunflower Rust (Puccinia helianthi) on Oilseed and Confection Sunflower
2022
Berghuis, Brandt | Friskop, Andrew | Gilley, Michelle | Halvorson, Jessica | Hansen, Bryan | Fitterer, Scott | Carruth, Dave | Schatz, Blaine | Benson, Bob | Humann, Ryan | Markell, Samuel
Sunflower rust, caused by Puccinia helianthi, is an economically and globally important disease of sunflower. Two types of sunflower are produced in the U.S. Northern Great Plains: the oilseed type and the confection type. Although approximately 80% of the acreage in this region is planted as the oilseed-type sunflower, fungicide efficacy and timing studies have been conducted primarily on the more rust-susceptible confection type. In total, 10 sunflower rust efficacy field experiments were conducted on oilseed type and confectionary type hybrid trials from 2016 to 2018. Eleven fungicides from three Fungicide Resistance Action Committee groups were evaluated for efficacy and protection of yield. Severity differences among fungicide treatments were identified in both confection and oilseed sunflower trials. A combined analysis of all confection field trials (five) indicated that rust severity was lower in all fungicide treatments as compared with the nontreated control. Despite rust severity levels below the recommended fungicide action threshold for confection sunflower, 7 of the 11 fungicide treatments had yield higher than the nontreated control. In oilseed trials, rust severity was lower in all fungicide treatments as compared with the nontreated control, similar to the findings of the confection type. Rust severity was too low to detect yield differences in oilseed trials. Additional work is needed to elucidate yield-loss potential on oilseed-type sunflower and refine the fungicide action threshold on confection-type sunflower.
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