Fungal and Bacterial leaf spots of soybean; How not to confuse these with soybean rust

    Institute of Ag Professionals Proceedings of the 2004 Crop Pest Management Shortcourse www.extension.umn.edu/AgProfessionals Do not reproduce or redistribute without the written consent of author(s). Foliar diseases of soybean that look like soybean rust.Jim KurleDepartment of Plant PathologyUniversity of Minnesota - St. PaulSoybean Rust in Minnesota• Unlikely that Rust will Overwinter in MN• Rust will Survive in Gulf Coastal Areas – Texas, Louisiana, Florida• Spores will Follow the “PucciniaPathway”• Risk Analysis Indicates Likelihood of Weather Conditions Favorable for Epidemic – 6 to 15 out of 30 Years.Soybean Rust Management• Currently – No Resistant Varieties Available• Management – Timely Application of Fungicides• Protectant Fungicides – Applied Before Infection• Eradicant & Curative Fungicides – Provide Control after Infection (Must be applied very early in disease cycle.)• Identification of soybean rust will be critical.Soybean Rust Identification• Identification of soybean rust requires training and experience.• A number of other foliar diseases are easily confused with soybean rust.• This presentation is intended to help you identify those diseases that can be confused with soybean rust.• By eliminating instances where “lookalike” diseases occur diagnostic resources can be focused on symptoms that might be those of soybean rust.Soybean Rust• Disease Development is favored by: – ...