Home

Organizing Committee

Presentations

Poster Presentations

Outcomes




Poster Presentations


40

Evaluation of fungicide spray programs for control of Asian soybean rust in Alabama

Presenter: Edward J. Sikora(1)

Other authors and affiliations: Dennis P. Delaney(2), Mary A. Delaney(1), Katheryn S. Lawrence(1), Malcolm Pegues(3). (1)Auburn University, Entomology and Plant Pathology, Auburn, AL 36849-5624, U.S.A.; (2)Auburn University, Agronomy, Auburn, AL 36849-5624, U.S.A.; (3)Auburn University, Gulf Coast Research and Education Center, Fairhope, AL, U.S.A.

Asian soybean rust (ASR), caused by the fungus Phakopsora pachyrhizi, has been a recurring problem for soybean growers in southwestern Alabama. Most growers have adopted a fungicide spray program that consists of two fungicide applications applied at the R2 and R4-5 growth stages. Because of the many fungicides available to growers, we decided to evaluate various fungicide spray programs under the relatively high ASR pressure in this area. The trial was conducted in 2006 in Fairhope, AL. The experiment was planted on June 1 with the soybean cultivar DP 7870RR. Thirteen sequential fungicide spray programs and an unsprayed control were evaluated in a RCB design with four replications. Fungicide treatments were applied as a foliar spray at R2 and repeated 21 days later at R4-5. The disease was first detected in the unsprayed control at the R6 growth stage. All fungicide treatments reduced the severity of ASR and percent leaf defoliation and increased the yield compared with the unsprayed control. Severity of ASR was higher for the Quilt-Quilt, Quilt-Folicur, and Quilt-Laredo programs compared with the Headline SBR-Headline SBR, Headline SBR-Folicur, Headline SBR-Laredo, Headline SBR-Topguard, Quilt-Topguard, and Stratego-Topguard programs on September 27. Severity of ASR was higher for the Quilt-Quilt, Stratego-Folicur, Quilt-Folicur, and Quilt-Laredo programs compared with the Headline SBR-Headline SBR, Headline SBR-Folicur, Headline SBR-Laredo, Headline SBR-Topguard, Quilt-Topguard, and Stratego-Topguard programs on October 9. The Stratego-Topguard program produced a higher yield compared with the Stratego-Stratego, Quilt-Quilt, and Stratego-Laredo programs. The trial was repeated in 2007.

View Poster                                         Back to Poster Presentations