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Lawn grubs #929008

Asked April 20, 2026, 4:40 PM EDT

Hello, I'm fairly certain we have a lawn grub problem - I've seen grubs and we have a good amount of animal digging damage this year. At the garden center They recommended GrubX (chlorantranillprole) plus Milorganite to deter animal digging; and told me this will not be toxic for bees, animals or fish. Will this product kill existing grubs or is it only a preventative? Please confirm I should use these products or if you could recommend any other solutions. How long after I apply should I wait to try and reseed (animals won't be digging)? Thanks!

Hennepin County Minnesota

Expert Response

Hi Kristin, 

GrubEx is low-risk for bees, is a long-lasting preventative and is one of the most effective ways to control grubs. It should not interfere with reseeding. GrubEx is applied from late spring to early summer, the same time for reseeding. Follow the directions on the product label, including watering well after application.

Here’s the University of Minnesota page on handling a grub problem:

https://extension.umn.edu/yard-and-garden-insects/japanese-beetles

This is an older fact sheet from Michigan State that goes more in-depth about managing a lawn with grubs.

https://www.canr.msu.edu/news/how_to_choose_and_when_to_apply_grub_control_products_for_your_lawn#:~:text=According%20to%20Michigan%20State%20University%2C%20grub%20control,Apply%20curative%20products%20in%20spring%20or%20fall

Note that it is normal for lawns here to have some grubs in the soil. Many beetles start life as grubs, so you will always see them when you dig.

Hope this helps. Good luck.

MJ Replied April 20, 2026, 5:12 PM EDT

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