Stripe Rust Alert in Johnston County, NC
Stripe rust has been found in Johnston County. It was found yesterday in a field of DG Shirley in Four Oaks. A stripe rust epidemic can develop much quicker than a leaf rust epidemic. If scouting reveals stripe rust in your field a fungicide should be applied as soon as possible to preserve yield. Wheat varieties rated susceptible (S) and moderately susceptible (MS) should be scouted immediately. Resistant (R) or moderately resistant (MR) varieties are at low risk. Apply fungicides to fields containing multiple stripe rust areas first before moving on to fields with less noticeable infections. A stripe rust focus is pictured above in Figure 1B.
When choosing a fungicide pay close attention to harvest restrictions on the label. Table 1 is abbreviated from NCERA 184 Fungicide Efficacy for Control of Wheat Diseases to include only fungicide products with an excellent stripe rust rating. The fungicides Prosaro, Caramba, and Folicur provide excellent protection against a stripe rust epidemic. Generic versions of the same active ingredient will provide equivalent control. These fungicides have a 30-day pre-harvest restriction so use caution when applying to fields nearing harvest.
Photo courtesy of Josh Joyner and Tim Britton/NC Cooperative Extension