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From: Eric Smoczynski
Chicago , IL
When should we in Northeastern Illinois apply grub preventer? Why is it applied in spring, when the grubs don't begin destroying lawns until mid-to-late summer? Thanks.

Extension Message
From: Richard Hentschel
Extension Educator, Horticulture
DuPage/Kane/Kendall Unit
Our main grub problem is the Japanese Beetle larvae with a similar life cycle to our native grub larvae. Grub treatment is not warranted unless there are at least 10-12 grub larvae per square foot! This will only be evident in mid to late summer as you suggest. There has been a decline in grub populations due to the drought of 2012 and the harsh winter soil temperatures, so monitoring grub populations is key to knowing if a treatment is justified. Finally, the active ingredients now available last several months in the soil, so a spring application could be done. This may be an unneeded expense placing pesticides into the environment where no grub management is needed.

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