Billbug

Scientific Name for NJ Species: Sphenophorus parvulus (Bluegrass)

Sphenophorus venatus vestitus (Hunting)

 

 

As they grow, they molt and move to the bases of plants, where they feed on the crowns. Eventually they also feed on roots and rhizomes. In areas where bluegrass billbug larvae have been feeding actively, there will be accumulations of "frass," or insect excrement, which is white and has the texture of fine sawdust. The "frass" serves as positive identification of bluegrass billbug damage. Feeding damage usually is evident along the edges of paved areas and may resemble salt damage (except that billbug damage appears in July). Eventually the damage may spread throughout the turf grass expanse. Larvae continue to feed for most of the summer and then pass through a brief pupa ("resting") stage in the soil in late August. Young adults then emerge and seek out suitable over wintering sites during September and October. Thus the primary period for damage is in late July and most of August, while the larvae are feeding actively.

 

 

Source: http://snyderfarm.rutgers.edu/pdfs/SodWebworms.pdf

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