By Erick DeWolf
There were a few more reports of stripe rust from Oklahoma this week and a twitter report of the disease in southeast Kansas bordering Missouri. Several colleagues made visits to research sites in south central Texas and reported severe leaf rust on varieties known to be susceptible to that disease. To date, extension agents, crop consultants and growers all indicate that rust is not widely active in Kansas.

Figure 1. Adult wheat leaves with symptoms of stripe rust. Notice the characteristic rectangular shaped lesions containing yellowish-orange reproductive structures of the fungus. Photo by Erick DeWolf, K-State Research and Extension.
With the wheat crop in south central and southeast Kansas approaching or already at the flag leaf emergence stages of growth, growers are encouraged to be on the lookout for diseases. When people think of stripe rust, they often visualize the characteristic bright yellowish-orange lesions on adult plants (Figure 1). Symptoms of stripe rust on younger leaves are often less rectangular because the fungal growth within the plant is not limited by the veins of younger leaves (Figure 2).