@rtdad Pull the outer part of the damaged turf. If it lifts off, look at the edge where the healthy grass starts. You will see little white 'balls' lol. Google pictures so you can be sure. Right now grubs a feeding solidly on roots and are big enough to notice. If you have very few, that is not considered an infestation. Healthy turf can handle that and grubs don't make babies :lol:
Grub cycle is very simple and in most cases is annual. Beetles start laying eggs early summer (from this the name June beetle). Eggs turn to grub that starts feeding on grass roots. They stay close to the surface and do the worst damage thru mid-late summer (for northern states). When weather starts cooling down, they go deeper in the soil and 'hide' during the winter. Once spring comes they will have another snack (not that heavy otherwise can't take-off)) and turn to beetles. And the cycle repeats.

Grub control has 2 faces: preventive and curative. The first is applied when (most of time) grubs are young (early summer). Two products come in mind: Merit with active ingredient imidacloprid (old school, toxic to pollinators but very effective) and acelepryn (the brand name from Syngenta, newer, safer, very expensive).
On the curative side I only know Sevin (active ingredient Carbaryl, very toxic even to humans). Sevin is sold today with a new active ingredient due to the mentioned.
You also have 2 in 1 as Scott's GrubEx.
Hope that gives you a rough idea,
B

 

Check the grub control thread in the pest folder.

 

I thought this graphic was cool.

 

I thought this graphic was cool.

Wooo- tell me more about this book!

 

@craigdt It's out of this book but I don't actually have it myself, the graphic itself was shared. But if the book is as good as this page makes it seem it may be worth picking up for $20.

https://extensionpubs.osu.edu/ohio-pesticide-applicator-training-a-study-guide-for-commercial-turfgrass-applicators/

 

All great responses!

I think I will wait until next spring to do a grub ex application. Thanks guys

 

 

@Redeye Very good visual!

 

It came from"Turfgrass Science Purdue University"

https://turf.purdue.edu/homeowner-publications/