What time of year is the larval damage from Bluegrass Billbugs usually visible?

The timing of larval damage from Bluegrass Billbugs is primarily observable from mid-June through July. During this period, the larvae are actively feeding on the grass blades and root systems, leading to the characteristic signs of damage such as thinning or dead patches in the turf. Warm temperatures coupled with the life cycle of the billbugs allow for this peak in visible damage, as the larvae have emerged and are in their feeding stage.

While other times of the year, such as early spring or late summer, may have activity or issues, the significant and noticeable damage occurs when the larvae reach a size and density that impacts the quality of the turfgrass. This timing aligns with the developmental cycle of the billbugs, confirming why mid-June through July is the crucial period for recognizing their impact on cool-season turfgrass.