You Are Here: Management Updates 1999 Archive June 18, 1999

Date: June 18, 1999
Category: Insects
Subject: Hyperodes Weevils, White Grubs

MORE WEEVILS!
So far the story of the year for turf insects is annual bluegrass weevils. We have been getting reports of insect damage from throughout the Northeast, and populations have been developing very rapidly. At this point (16 June) it is too late to treat for the weevils in most locations. Most of the insects are in the largest larval stage or have moved on to the pupa stage. So now we are into a waiting game - wait until the new adults become active. (Often you will notice the weevils moving in the grass clippings that have been collected from greens.)

My best projection is that golf course managers in southern New England or southeastern New York will want to treat for the second generation (if there was visible damage during the past couple weeks). That treatment should be made sometime between 23 June and 30 June in the southern New England region, and perhaps about a week later further north. there are several options, including Dursban or the various pyrethroids. This list is NOT inclusive. Be careful and avoid spraying on a hot, sunny day if possible. (Treat early in the morning to avoid the worst of the heat.) Irrigate lightly, perhaps one or two passes of the sprinkler. Feel free to call the lab (413-545-0268) if you have any questions or want some guidance.

Small good news - at least the Japanese beetle grubs and their cousins should be done feeding VERY soon.European chafer adults are already flying in large numbers (often congregating in trees just as the sun sets), and we expect to see Japanese beetle adults flying within a week. Now is the time, though, to decide what you will be doing about the young grubs that will start showing up in mid July (European chafers) to mid August (Japanese beetles). If you plan to use a slow acting material, you probably should make that application during July. If you are using a more traditional material, scout to confirm presence of grubs and treat in August. Whatever you use, WATER in with at least 0.25 inch irrigation.

- Submitted by: Dr. Pat Vittum