What colorful term is used for circular dead patches caused by certain fungi?

The term "fairy rings" refers to circular dead patches that appear in lawns and other grassy areas due to the activity of certain fungi. This phenomenon occurs when these fungi decompose organic matter in the soil, leading to a nutrient imbalance that affects the grass within the circle. As a result, the grass in the center of the ring often dies or fails to thrive, while the grass at the edges of the fungi's mycelial growth may appear healthier and greener. The name "fairy rings" originates from folklore, where it was believed that fairies danced in these circles, giving them a mysterious and magical connotation.

Understanding this term is important as it helps in identifying lawn problems and implementing appropriate management strategies. Identification of fairy rings enables a landscaper or horticulturist to differentiate between various lawn ailments and apply targeted remedies rather than generic treatments that may not address the specific issue.