Organizing Committee


Poster Presentations


Poster Presentations


Fungicide evaluations for managing Asian soybean rust and other diseases affecting Louisiana soybean

Presenter: G. B. Padgett

All authors and affiliations: G. B. PADGETT (1), M. A. Purvis (1), S. Martin (2), and C. A. Hollier (3). (1) Northeast Research Station, Macon Ridge Branch, LSU AgCenter; (2) Syngenta Crop Protection, U.S.A.; and (3) Department of Plant Pathology and Crop Physiology, LSU AgCenter

In 2005, 2.86 million bushels were lost to soybean diseases in Louisiana. While diseases are not uncommon in Louisiana, the recent report of Asian soybean rust (ASR) has spawned concern among producers. Knowledge on the performance of the newer fungicides, namely triazoles, on ASR and other diseases in Louisiana soybean is limited. Therefore, LSU AgCenter and industry scientists initiated research to address this concern. Tests were conducted during 2006 on experiment stations and in producer fields located near Alexandria, Baton Rouge, Jennings, and Winnsboro, LA. Epidemics of ASR, Cercospora leaf blight, and/or aerial blight developed in most test areas. Fungicides were applied once or twice during the R1-R5 reproductive stages using commercial or experimental spray equipment. Disease incidence and severity were quantified periodically during the growing season. When possible, test plots were harvested to assess the impact of disease on soybean yield and quality. Triazole fungicides were effective for preventing the development of ASR but varied in efficacy against other diseases (Cercospora blight and aerial blight). Strobilurin fungicides were effective for limiting ASR, as well as aerial blight and Cercospora leaf blight. At some locations, yields were 27 bu/acre more in soybeans treated with fungicides than in nontreated soybeans. More research is needed to determine the utility of the newer fungicides in Louisiana soybeans.

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