High Plains Disease (Unknown): This disease is found on the Texas High Plains on corn and wheat. It is suspected to be a virus vectored by the wheat curl mite. Symptoms consist of yellow areas that eventually form yellow bands. The earlier the infection the more destructive the disease. Early infected plants are stunted (photo6). Ears will be reduced in size and partially filled (photo 7). The disease continues throughout the season. Hybrids will differ in susceptibility (figure 1). Suggested controls for sweet corn include planting early, using resistant hybrids, plowing volunteer wheat, and in general, staying away from grain such as wheat, barley, and rye. Weeds and native grasses that serve as hosts should also be avoided.
