Efficacy of Foliar Fungicides for Control of Stripe Rust on Winter Wheat in Pullman, WA, 2025

Stripe rust is a destructive disease of wheat, and its damage can be reduced by applying fungicides. This study was conducted in a field near Pullman, WA, under both natural infection and artificial inoculation of Puccinia striiformis f. sp. tritici in 2025 to determine the efficacy of 23 fungicide treatments on the control of stripe rust on a susceptible winter wheat variety. All fungicide treatments significantly reduced relative area under the disease progress curve (rAUDPC); three of them had significantly higher test weight; and 19 of them produced significantly higher grain yield than the nontreated check. The significant yield differences compared with the nontreated check ranged from 15.2 bushels/acre (14.5%) to 46.6 bushels/acre (44.7%). The results are useful for growers to select fungicides and the timing of application for controlling stripe rust on winter wheat.