Tar spot is a foliar disease of corn that has recently emerged as an economic concern for corn production in the Midwestern U.S. It is not a new disease, having been first identified in 1904 in high valleys in Mexico. Historically, tar spot’s range was limited to high elevations in cool, humid areas in Latin America, but it has now spread to South American tropics and parts of North America. It first appeared in the U.S. in 2015.

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Corn rootworm larvae begins hatching in late May to June. “Generally, corn rootworm hatch occurs close to the time that we begin seeing lightning bugs outside in the evenings,” said AgVenture Agronomy Lead Louis Sutton. “This is not 100% true, but it gives us a good indication of the hatch timing. When this happens, set a reminder to begin scouting in the next couple of weeks.”

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