BROWN SPOT

Description: Brown spot is a fungal disease that produces irregular, dark brown spots that vary from minute flecks to lesions 3/16" in diameter. Lesions coalesce, turn dark brown and may have a yellow border surrounding the blotchy brown areas.

Location: Brown spot occurs throughout Ohio and can be severe in continuous soybean production fields.

Time of infection: Spread of brown spot occurs early in the season on young seedlings and again late season as the crop begins to mature. Wet conditions with heavy rain spreads the fungus upwards in the plant canopy.

Management:
· Crop rotation
· Tillage

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Corn, Soybean, Wheat, and Alfalfa Field GuideBulletin 827