Florida guy here. We have a longer sod webworm season than most.

I'm planning on using GrubEx instead of Acelepryn this year. My plan is 1.5 lbs GrubEx per 1K sq. ft. every two months from April 1 to Oct 1. I believe this translates to an equivalent rate of Acelepryn at 4oz per Acre under the sod webworm preventive assurance program.

Here's my journal entry for my first app: https://thelawnforum.com/viewtopic.php?p=369106#p369106. You'll also see the follow-up posts where we are discussing the annual maximums of different products.

 

I also live in NJ and apply GrubEx in May, before Memorial Day. I make an extra effort to do it sooner in the month if there is a big storm coming because it has to get watered in for it to work.

 

This Michigan State article suggests "between April 1 and May 30 (no later than July 15) for best results" for GrubEx. I assume the advice is geared toward Michigan residents, but I think the information applies much more broadly.

https://www.canr.msu.edu/news/how_to_choose_and_when_to_apply_grub_control_products_for_your_lawn

 

I'm in Indiana and I'm planning on putting it down in May.

 

I was checking this on the cool season guide. As per g-man and the thread on grub protection the ideal window seems between April and early May.

Spring to do list:
If grubs have been a problem in the past or if you dont want any risk with them, then spring is the time to apply a grub preventer. GrubEx (chlorantraniliprole) is my choice since it is nicer to bees. Apply as soon as your lawn greens up. A second product is imidacloprid, but there are studies that link it to environmental issues (bees). MSU Grub Article and Grub Control Thread

I will be putting it down tomorrow for the coming rain over the week.

 

Are you guys equating grubs with sod webworm? I don't think you can necessarily draw conclusions about webworm from grub research.

 

Are you guys equating grubs with sod webworm? I don't think you can necessarily draw conclusions about webworm from grub research.

Can you expand on your comment? Are you saying the active ingredient in Grub ex will not control sod webworms? What do you recommend as far as timing etc.....

 

Can you expand on your comment? Are you saying the active ingredient in Grub ex will not control sod webworms? What do you recommend as far as timing etc.....

No, I'm not saying that at all. I'm saying that the program Sygenta put together for sod webworms looks very different to me than the standard guidance I've seen for grubs. I'm saying that they are different pests and probably can't be managed exactly the same way.

 

Are you guys equating grubs with sod webworm? I don't think you can necessarily draw conclusions about webworm from grub research.

That's what I'm thinking also.

 

LCN recommends applying GrubEx when soil temps hit 70 degrees. That's what I plan on doing. I'll also put down the 2nd app of Prodiamine on the same day and water both in.