Southern rust is generally more damaging to corn than common rust due to its ability to rapidly develop and spread under favorable conditions. In a Pioneer research study conducted near Camilla, Georgia in 2014, treatment with DuPont™ Aproach® Prima fungicide significantly reduced southern rust symptoms and increased corn yield by an average of 20 bu/acre (Poston, 2014a). Fungicide yield response of individual hybrids ranged from 10 to 38 bu/acre. Yield losses in excess of 80 bu/acre due to southern rust have been reported from university research trials in Alabama (Hagan, 2017). Southern rust has increased in importance in the Southern U.S. and has appeared more frequently in Midwestern states in recent years, making careful monitoring and correct identification of the disease critical for making timely and effective management decisions.
1Mark Jeschke, Agronomy Information Manager, Corteva Agriscience, Johnston, IA.
2Bill Dolezal, Former Research Fellow, Corteva Agriscience, Johnston, IA.
3Adda Sayers, Former Research Scientist, Corteva Agriscience, Johnston, IA.
4Steve Butzen, Agronomy Information Consultant, Corteva Agriscience, Johnston, IA.
The foregoing is provided for informational use only. Please contact your Pioneer sales professional for information and suggestions specific to your operation. Product performance is variable and depends on many factors such as moisture and heat stress, soil type, management practices and environmental stress as well as disease and pest pressures. Individual results may vary.