You Are Here: Management Updates 1999 Archive May 21, 1999

Date: May 21, 1999
Category: Insects
Subject: White Grubs, Hyperodes Weevils

As we approach the end of May, white grubs are still active but it is too late to treat for those grubs in all but the most unusual circumstances. Keep in mind that the European chafer grubs (particularly damaging in eastern Massachusetts) will only be feeding for another couple weeks or so before they begin to clear out their digestive systems in preparation for pupating. European chafer adults will start emerging in the middle of June in many locations. Japanese beetle grubs will be a little behind that schedule, and adults will start flying in early July. For now, manage the damage - water affected areas when possible, roll areas that have been "rototilled" by grubs or scavenging animals.

Annual bluegrass weevils (Hyperodes weevils) appear to be right on schedule in most of southern New England. Based on observations from pitfall traps in the Hartford and Danbury (CT) areas, we know that adult weevils have finished migrating from overwintering sites and have begun to lay eggs in areas from Hartford south. Egg laying seems to be beginning in much of Massachusetts. It is too late for treatments directed toward adult weevils from most of Massachusetts south. spot treating for larvae should begin when larvae first become apparent (turf wilting and not responding to water), probably in early June in the metropolitan area and slightly later further north.

Lawn pests - we have had no direct reports on billbug or chinch bug adult activity, but from past experience, we can guess that both insects are "on the move". Keep turf growing vigorously and encourage homeowners to raise the height of mowing.

- Submitted by: Dr. Pat Vittum