Lesion centers dry out and turn brown to black with watersoaked margins and yellow halos. Lesions may coalesce resulting in large blighted areas. Affected tissue often drops out, giving a tattered appearance to the leaves. Rarely a serious disease in Indiana soybeans. Cool, rainy weather.
Outbreaks often follow thunderstorms.
Seed, infected crop residue. Lesions eventually darken to brownish black. Lesions are primarily found on leaves, but can also occur on stems, petioles and pods. Early season infection is restricted to unifoliate and first trifoliate leaves. Extended warm, wet weather.