What symptom typically indicates a grubbing pest presence in lawns?

The symptom that typically indicates the presence of grubbing pests in lawns is the grass turning yellow to brown. Grubbing pests, such as grubs, feed on the roots of the grass, which disrupts the plant's ability to absorb nutrients and water. As this damage occurs, the grass becomes stressed, leading to a yellowing and browning appearance. This discoloration is a clear indicator that the grass is not thriving, often due to root damage caused by these pests.

Stunted growth can result from various issues, including nutrient deficiencies and environmental stressors, but it is less specific to grubbing pests. Fungus growth may indicate other problems, such as excessive moisture or poor drainage. Leaves falling off could suggest a different type of pest or environmental issue, such as disease or drought stress, rather than being directly related to root-feeding pests like grubs. Understanding these symptoms helps lawn care professionals diagnose issues and take appropriate action against grubbing pests effectively.