Stripe rust (caused by Puccinia striiformis f. sp. tritici) is a damaging disease of wheat and can be controlled by planting resistant cultivars and/or applying fungicides. This study was conducted in a field near Pullman, WA in 2025 with artificial inoculation of the pathogen to determine yield losses by stripe rust and yield protection by the applications of fungicides Trivapro and Tilt on 23 commercially grown spring wheat cultivars, plus a susceptible check (AvS). The fungicide applications significantly reduced stripe rust in AvS and two commercial cultivars but did not increase test weight or yield in any tested cultivars including AvS. This was likely due to slow and low rust development under dry weather conditions. These results indicate that fungicide application is not necessary when stripe rust pressure is low.
Chen et al. (Thu,) studied this question.