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55

Effect of fungicide coverage on control of soybean rust

Presenter: Tristan A. Mueller(1)

Other authors and affiliations: Jim J. Marois(1), David L. Wright(1), Daren S. Mueller(2). (1)University of Florida, North Florida Research and Education Center, Quincy, FL 32351, U.S.A.; (2)Iowa State University, Ames, IA 50011, U.S.A.

Foliar fungicides are currently the only tactic to manage soybean rust. Because soybean rust typically begins in the lower canopy, it is hypothesized that improved fungicide coverage in the lower canopy will improve fungicide efficacy and soybean rust management. The objectives of this experiment were to determine if complete coverage of fungicides will improve management of soybean rust and subsequently improve soybean yields and to determine the importance of the lower canopy on yield. The treatments were (i) complete coverage of Folicur at growth stage (GS) R4, (ii) normal coverage of Folicur at GS R4, (iii) normal coverage of Folicur at GS R4 with the lower half of the canopy removed, and (iv) a nonsprayed control. Complete coverage was attained using a backpack sprayer at 70 gpa and normal coverage was attained with a boom sprayer at 15 gpa. Plots were established in a randomized complete block design in at the NFREC in Quincy, FL. There were no statistical differences between the normal and complete coverage treatments for final soybean rust severity, but it was lower than the nontreated control. There were no statistical differences between the normal and complete coverage treatments for yield. However, removal of the lower canopy significantly lowered yield. All of the treatments had less disease and higher yields than the nonsprayed control. From 1 year of data, the improved coverage of fungicides did not improve management of soybean rust or yield. While fungicide coverage is important, added efforts at maximizing coverage may not be necessary.

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