From a thread in the insect forum.

Bifen if he buys chemicals and sprays.

Something like this if he's not able to spray:

https://www.lowes.com/pd/Spectracide-Triazicide-For-Lawns-and-Landscapes-32-fl-oz-Concentrate-Insect-Killer/4736723?cm_mmc=shp-_-c-_-prd-_-lwn-_-google-_-lia-_-241-_-outdoorpesticide-_-4736723-_-0&placeholder=null&ds_rl=1286981&gclid=Cj0KCQjwpf2IBhDkARIsAGVo0D0gBspZlR-HPvOG8sdMKrNf8T4iQRBHniwhIvbNSalpL4I2VnOWQLgaAofbEALw_wcB&gclsrc=aw.ds

Something like this if granular is an option:

https://www.lowes.com/pd/BAYER-ADVANCED-24-Hour-Grub-Killer-Plus-10-lb-Insect-Killer/3353712

EDIT: The important part here is the "Kills on Contact or Kills in 24 hours" Anything that says season long control is probably the wrong product.

 

I've had good luck with the Spectracide spray bottle...read the instructions, soak the lawn early in the morning to drive them to the top of the thatch and nuke the b*stards. I'm doing a follow up this weekend...11k sqft, two bottles.

 

@Erickson89 I agree with @cyrjm The Spectracide hose attach spray bottle is easy to use and a WAY better option than granular. Best to get a few extra bottles for a second treatment as when areas start to get heavy infestation all your neighbors go to HD or Lowes for the same bottles.

 

I've been able to get them using some cheap Triazicide from the big box stores. They're not hard to kill but breaking the cycle is tough and will take multiple apps regardless of what you use.

 

I've been able to get them using some cheap Triazicide from the big box stores. They're not hard to kill but breaking the cycle is tough and will take multiple apps regardless of what you use.

Breaking the cycle? I saw a huge infestation coming this morning. It was shocking how many actually. Went to HD and got two types of "kills in contact" insecticide and put them down. I have lots of dead army worms now. Do I need to plan on killing another round or two of them soon?

 

I've been able to get them using some cheap Triazicide from the big box stores. They're not hard to kill but breaking the cycle is tough and will take multiple apps regardless of what you use.

Breaking the cycle? I saw a huge infestation coming this morning. It was shocking how many actually. Went to HD and got two types of "kills in contact" insecticide and put them down. I have lots of dead army worms now. Do I need to plan on killing another round or two of them soon?

Sadly, maybe. The moths are migratory, come and lay eggs, you get armyworms, they make more moths...etc

 

I've been able to get them using some cheap Triazicide from the big box stores. They're not hard to kill but breaking the cycle is tough and will take multiple apps regardless of what you use.

Breaking the cycle? I saw a huge infestation coming this morning. It was shocking how many actually. Went to HD and got two types of "kills in contact" insecticide and put them down. I have lots of dead army worms now. Do I need to plan on killing another round or two of them soon?

Sadly, maybe. The moths are migratory, come and lay eggs, you get armyworms, they make more moths...etc

Well I'm glad I caught them this time. I never really see any moths but my property backs up to 28 acres of woods so who knows. I ordered some Bifen XTS so I can spray instead of useing big box granulars. Is there any residual protection from the insecticide? Or can army worms only be treated when seen?

 

Well I'm glad I caught them this time. I never really see any moths but my property backs up to 28 acres of woods so who knows. I ordered some Bifen XTS so I can spray instead of useing big box granulars. Is there any residual protection from the insecticide? Or can army worms only be treated when seen?

A LOT of us spray Bifen every 30 days and Imidacloprid every 90. Yes there is some residual, few weeks to a monthish, depending on rain.

 

Thank you everyone. I went and picked up the 24 hour grub killer from Lowe's and put it down but of course we ended up having an unexpected torrential downpour like an hour after I put it down. Went outside to check this afternoon and I still see a ton of fully grown, medium sized, and baby green ones crawling about. Do I need to grab the hose end sprayer and put down a bottle or two to cull this down?

I normally use a fiskars reel mower to cut. Should I use my rotary mower to suck and kill as many worms as I can?

 

Thank you everyone. I went and picked up the 24 hour grub killer from Lowe's and put it down but of course we ended up having an unexpected torrential downpour like an hour after I put it down. Went outside to check this afternoon and I still see a ton of fully grown, medium sized, and baby green ones crawling about. Do I need to grab the hose end sprayer and put down a bottle or two to cull this down?

I normally use a fiskars reel mower to cut. Should I use my rotary mower to suck and kill as many worms as I can?

YES, to spray.

 

Just a quick update to end out the discussion. I picked up the spray and went to work. I sprayed heavier where the most of the worms were. Ended up going outside to check the next day and saw 2 worms in the area I was inspecting and they were struggling. Thank you everyone as you saved my yard from experiencing much damage. I ended up having a couple areas that you could tell where thinned but overall it was good.

 

Just a quick update to end out the discussion. I picked up the spray and went to work. I sprayed heavier where the most of the worms were. Ended up going outside to check the next day and saw 2 worms in the area I was inspecting and they were struggling. Thank you everyone as you saved my yard from experiencing much damage. I ended up having a couple areas that you could tell where thinned but overall it was good.

The good news is the thin spots will green up fast as the worms just eat the foliage and don't harm the root system.

 

The good news is the thin spots will green up fast as the worms just eat the foliage and don't harm the root system.

There are several species that vary in method of damage. Army worms certainly impact the root system. Same with Glass Cutworms. Cutworms tend to come up to the surface at night and chew on grass blades. It's not uncommon for a root system in its entirety to vanish due to neglect.

1000's of Armyworms hatch every few days. Depending on insecticide used, in most cases several monthly treatments needed as Moths come back week after week and lay 1000's more.... each. So if you have 50 moths landing on your lawn, you can easily expect 50,000 to 100,000 worms. That's some serious damage right there.

 

Dylox granular