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

The larval damage from Bluegrass Billbugs is typically visible from mid-June through July. During this period, the larvae are actively feeding on grass, particularly within the crown and roots, leading to noticeable damage. This damage often manifests as wilting or thinning of the turf, and patches may appear dead or drought-stressed.

The lifecycle of the Bluegrass Billbug involves adults laying eggs in the spring, and by mid-summer, the larvae have developed enough to cause significant harm. Understanding this timing is crucial for effective pest management, as this is when control measures are needed most to protect the health of cool-season turfgrass in Pennsylvania. The damage is less detectable outside of this time frame, making mid-June through July the most critical period for observation and intervention.