When to treat for grubs

Asked April 4, 2019, 10:19 PM EDT

I had my bumpy lawn aerated this week, and I was told I have grubs. Picture of one of several grubs found. Should I treat with a grub killer, or a grub preventative? Or both? When should it be done? Zip code 48101.

Wayne County Michigan

1 Response

Not necessarily should you treat for grubs. Because they found a grub or two does not mean there is a problem because some grubs can be found in most lawns. The best thing you can do for your lawn is mow high, 3 inches or higher which can solve the grub problem, if there is a problem, but does other wondrous things for your lawn as well. Read the following: https://www.canr.msu.edu/resources/mow_high_for_weed_and_grub_control

Mowing high allows the root system to grow and expand. The top growth supports the root growth and not the other way around as commonly thought. Scalp the lawn as so many do routinely and it jettisons roots it does not need. Therefore. the only way to have a dense lawn is to mow high. Mowing high also shades out crabgrass and weed growth to the point that pre-emergents and weed control are not needed once dense growth is achieved. If ever deemed needed you can read more about grub control here: https://www.canr.msu.edu/news/how_to_choose_and_when_to_apply_grub_control_products_for_your_lawn