Northern corn leaf blight (NCLB) has been reported in numerous fields in Iowa. Most of the reports have come from central and western Iowa, but since the pathogen that causes this disease is spread by wind and rain, the disease could be more widespread.
Symptoms of NCLB
Typical symptoms of the disease are large (1- to 6-inch long) cigar shaped lesions that are usually tan (Figure 1). NCLB is sometimes misdiagnosed as Goss’s wilt and leaf blight although there are certain characteristics of the lesions that enable the two diseases to be differentiated.