DISEASES OF CORN
Tar Spot
Tar spot of corn (caused by the fungus Phyllachora maydis) was first confirmed in the United States in 2015 on dent corn in seven counties in northwest Indiana and 10 counties in north-central Illinois. The disease was detected very late in the growing season and no yield loss was reported in fields where the disease was first confirmed. In 2018, a yield-reducing epidemic of tar spot occurred in northern Indiana and in surrounding states. Following this epidemic, tar spot was detected in 172 counties across six states in the Midwest (Kleczewski et al., 2019). Tar spot was confirmed in 38 Indiana counties in 2018 (Figure 1).
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