Susceptible varieties of spring wheat are showing high levels of infection from stripe rust if they are not protected by fungicides. High levels are showing in Klasic, for example, from the Aberdeen area through Idaho Falls.
Some formerly resistant varieties are showing low levels of stripe rust as well. There is heavy disease pressure in southeast Idaho. As spring wheat is starting to head, please be aware that strobilurin fungicides should not be used to control stripe rust due to the potential for increased DON levels from Fusarium head blight. Choose a fungicide that will be effective for both stripe rust control and FHB suppression and if possible, target application window for FHB suppression.