What is a key indicator of pest infestation in turfgrass?

A key indicator of pest infestation in turfgrass is the presence of irregular patches of dead or stressed grass. This condition typically arises when pests such as grubs, billbugs, or other soil-dwelling insects damage the root system or cause stress to the grass. These pests may either feed on the roots or create environments conducive to diseases that can further harm the grass.

The appearance of dead areas or stress symptoms, which may include yellowing, wilting, or thinning of the grass, often serves as a visual cue for the presence of underlying pest issues. Turfgrasses are particularly susceptible to damage from pests, and recognizing these signs can lead to timely intervention, thus preventing more extensive damage to the turf.

In contrast, green lush patches may indicate healthy growth and are typically not associated with pest problems. Excessive flower growth can be a sign of specific plant stress or other environmental factors rather than direct pest infestation. Increased insect activity in the air could suggest that insects are present, but it does not specifically indicate damage to the grass or confirm a pest infestation in the turf itself, making it a less direct indicator compared to the irregular patches of dead or stressed grass.