You Are Here: Management Updates 2004 Archive September 3, 2004

Date: September 3, 2004
Category: Insects
Subject: White Grubs

Jennifer Grant, from New York State, reports that samples collected on athletic fields in Syracuse, NY, revealed European chafer and Japanese beetle grubs. In both cases, about 25% of the grubs were first instars and 75% of the grubs were second instars.

Our own sampling in western Massachusetts has revealed a similar distribution. The grubs are out there, and beginning to grow. The rain patterns of the past summer may have masked grub activity, but we are beginning to get reports from turf managers that skunks have become active and are rummaging for those tasty grubs. As far, we have not figured out how to teach the skunks (and raccoons and crows and grackles and on and on) to put the turf back after they are finished dining.

The only option at this point is a curative treatment. The most widely available product that would work quickly is trichlorfon (Dylox™). But keep in mind that managers on school grounds in Massachusetts cannot use Dylox™. Meanwhile for the folks in Maine, as far as I know, no emergency permits have been issued. We just put out a small field test using beneficial nematodes, but we won't know the results of the test for at least four weeks.

So for now, scout your suspect areas. Even if things look reasonably "clean" right now, there may be grubs lurking underneath. Skunk damage can erupt very quickly, and the varmints are hard to discourage once they get comfortable dining on your grubs.

Submitted by: Dr. Pat Vittum