Bipolaris Leaf Spot
(Bipolaris setariae)
Symptoms:
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Foliar symptoms vary, as brown lesions, fine linear streaks, small oval spots, large irregular oval, oblong, or almost rectangular spots measuring 1-10 x 0.5-3 mm. Large fusiform lesions are sometimes produced. Lesions may expand and coalesce. Lesions may be solid dark brown but usually become tan or greyish brown with a more or less distinct dark brown border (Luttrell 1954).
Pathogen and disease characteristics:
The pathogen causes seed decay, seedling blight, leaf spot, and head mold of bermuda grass. Young plants and maturing plants most susceptible to foliar blight (Wells and Burton 1967). Seedling blight is more pronounced at temperatures of 77F and less.
Control
Bipolaris leaf spot can be controlled with fungicide treatment.