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POSTERS: Integrated Pest Management II

P-316 - Integrated Management Strategies for Wheat Stripe Rust

Tuesday, August 5, 2025
9:30 AM - 10:15 AM HST
Location: Exhibit Hall 3
Abstract Text: Genetic resistance and fungicide applications are key components of wheat stripe rust (Puccinia striiformis f. sp. tritici) management in the U.S. However, most studies evaluate fungicides on a susceptible variety, limiting insights into their interaction with genetic resistance. This study aimed to identify fungicide products and application timings that complement genetic resistance to enhance disease management. A split-plot design was established over two growing seasons (22/23, 23/24) in Rossville KS, with fungicide product (Prosaro 8.2 fl oz/A, Topguard 14.0 fl oz/A, Tebustar 4.0 fl oz/A, Nexicor 13.0 fl oz/A and Headline 6.0 fl oz/A) and application timing (FGS 7 and FGS 9) as whole-plot factors and genetic resistance (moderately resistant and susceptible) as the sub-plot. Stripe rust severity was assessed weekly post-flag leaf application, and the Area Under Disease Progress Curve (AUDPC) was estimated. Grain yield and test weight were measured at harvest. Results indicate that cultivar played a significant role in disease suppression, with the moderately resistant cultivar having lower AUDPC and higher yield (p < 0.01). Fungicide application timing also contributed to disease suppression (p < 0.01), with FGS 9 applications providing greater AUDPC reduction than FGS 7 (p < 0.01), particularly for the moderately susceptible cultivar. Fungicide efficacy was more influenced by timing rather than product choice. These findings highlight the importance of integrating genetic resistance with well-timed fungicide applications to enhance disease control and improve yield.