Army Worms in western PA.


LawnSite Member
At the end of last week I noticed some browning in the new turf around my building and saw army worms on my sidewalk. To be honest, I've never seen them before. From what I understand is that they are usually a southern problem. I have since seen them on the last 3 lawns that I have done service calls for brown areas. I treated with bifenthrin at 1oz per 1000 and it seemed to do the trick but, the devastation that is done in 24hrs is insane! What is everyone's protocol on these? I have 1600 accounts and I'm wondering how the hell to deal with them? Is it too late once I see the damage?


LawnSite Senior Member
Treat as they show up, usually i get some lingering control from the bifen app.

But if its a bad year and this one sure is, you just have to go out again in about a month with the Bifen. They operate on a monthly cycle.

Might get some control with something else like Imidacloprid.


LawnSite Bronze Member
Akron area is getting hit. Mostly on invasive creeping bent but may have to spray a new KBG yard that looks to be getting hit.


LawnSite Senior Member
Onalaska, WI
I do believe merit controls them , but for the most part they dont kill the grass it will come back

I have a product for the orchard, Wrangler that is Imidacloprid that is a fantastic for use in the orchard. Treats an acre of trees in the orchard for about $3/acre but it is not labeled for turf. I have to think it would work very well for grubs and army worms but sadly the label is the law.


LawnSite Member
Spent the majority of the day fielding calls, diagnosing then treating with bifenthrin @1oz/1000. Hoping the lawns bounce back. I would say half look like they will and half look toast


  • 20210830_113704.jpg
    579.5 KB · Views: 105
  • 20210830_114130.jpg
    615.7 KB · Views: 103


LawnSite Fanatic
Pittsburgh PA
How long did it take to go brown like that???

I just mowed a property today and it had multiple, large, browned out areas that were green last week.
Initially I blamed it on the fert guys because there were some "spinouts" in the grass (last week) - I assume someone new who didn't know how to operate the stand on spreader. I figured he may have burned the grass with too much fert.

Then I saw a bunch of "holes" in the grass - I'll assume it was skunks digging for bugs. "Grubs" may be the culprit, but I'm not sure how long it takes for grub damage to appear - or if it's similar to army worms - don't know anything about those at all.


LawnSite Fanatic
Grand Rapids MI
More likely it is bird-peck holes. Commonly seen when flocks of starlings or similar birds start feeding on gurbs. I mean grubs.
Do you have pictures?
Can anyone shows us a picture of bird-peck holes?
I have pictures somewhere. Probably posted in one of my old threads.

Dig up a couple sqft of the affected turf. Search for white grubs. Five or more per square foot are considered a problem. This needing treatment.
Frequently, you will also see digging in spots caused by skunks feeding on the grubs. And sometimes armadillos. I am sure there are pictures on Lawnsite.


Top Forums