The previous article on lawn problems mentioned that patches can often be caused by lawn diseases. One of the most common is the fungus red thread ( Laetisaria fuciformis ) , which generally develops in late summer or autumn, especially when the weather is wet. Red thread usually develops on grass that is badly aerated and low in nitrogen. Even if you regularly apply nitrogen, heavy or prolonged rain may wash it away. The patches caused by this fungus often appear reddish at first, although they will later turn to lighter brown or look bleached. The patches are usually between...
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