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Symptoms of Pythium Blight Disease

Pythium blight disease, also known as cottony blight or grease spot, is a common fungal disease that affects turfgrass and can cause significant damage to lawns and golf courses. It is caused by the pathogen Pythium aphanidermatum.

Early Symptoms

The first signs of pythium blight disease often appear as small, circular patches of wilted or discolored grass. These patches may initially be yellow or light green in color and can quickly expand in size, merging together to form larger areas of affected turf.

Fungal Growth

As the disease progresses, a white, cottony or greasy fungal growth may develop on the affected grass blades, giving the disease its common names. This growth is most noticeable in the early morning when dew is present on the grass.

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Leaf Lesions

Infected grass blades may develop irregular, water-soaked lesions that can vary in size and shape. These lesions may initially be small and circular, but can enlarge and coalesce, causing the affected grass to appear water-soaked or slimy.

Root Rot

Pythium blight can also cause root rot, leading to the decline and death of the grass plants. Infected roots may appear brown or black and can be easily pulled from the soil. In severe cases, the affected turf may become thin and sparse, with bare patches appearing.

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Favorable Conditions

Pythium blight disease thrives in warm and humid conditions, particularly when the grass is constantly wet or overwatered. It is more common in poorly drained areas or in lawns with excessive thatch buildup. Overcrowded grass and compacted soil can also contribute to the development and spread of the disease.

Early detection and proper management practices, such as improving drainage, reducing thatch, and avoiding overwatering, can help prevent and control pythium blight disease. Fungicides may also be used as a preventative measure or to treat severe infections.

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Keywords: disease, pythium, blight, affected, common, fungal, appear, patches, growth