Now’s the Time to… Repair Lawns Affected by Grub Damage

This has seemed like a particularly bad year for grubs in Western PA. And we should not be too surprised because during the summer months, we had noticed an increasing number of requests for Japanese beetle traps (one of the adult life forms of the lawn-damaging white grub). So, how can we diagnose and treat for lawn damaging grubs, you might ask? We have some quick answers to these questions below.


How do I know if I have grubs? There are a few obvious tell-tale signs that you have grubs in your lawn. First, would be extensive browning during the early fall, late summer. The second would be a lawn that is very easy to pull up. If the dead spots in your lawn pull up in sheets, or if it can be rolled back with ease, you definitely have grubs! Lastly, if you notice digging in your lawn from animals (largely at night), you are seeing the remnants of large animals or rodents that have been searching for grubs in your soil. Amazingly, they are not wrong many times and they have a sense if they are inside your soil. So when you notice extensive digging in your lawn, it is probably a result of grubs in your soil.

How best to treat for lawn-damaging grubs? Grubs feed on the roots of healthy grass just beneath the soil surface. They continuously move around your lawn, so brown spots of affected lawn will grow and become more numerous. To treat for grubs at this time of the year, there is really only one quick-kill product, and that is 24-hour Bayer Advanced Grub Killer. After being watered in to the soil, this chemical is ingested by the grub and they die quickly. Because grubs are always moving around your lawn in search of new healthy roots to nibble on, you can’t be 100% sure where they are active at any given time. As a result, you want to apply this grub treatment on your entire lawn. After waiting a couple of days, you should be ready to reseed all brown areas. You will need to remove dead grass, loosen the soil beneath (refill with loose top soil if needed), and then choose a grass seed that will thrive in your lawn.

What type of seed should I use? There are many times of seed available and most bagged products are very good. We sell and recommend Jonathan Green and Scotts grass seeds for this time of the year and the mixes that you would choose now are the same as you would choose during the spring or summer. Essentially, you want to choose a grass seed that is targeted for the amount of sun and the type of soil that is present in your lawn. This means that in shaded areas, you want to use a mix with lots of fescues (fine and tall). In more sunny areas, you will want to go with something with more ryegrass and tall fescues and some bluegrass as well. If in doubt of the area’s conditions and you want a general all-around mix, then our Penn State mixture is a good one for you.

We hope that you don’t have grubs this year, but if you do, we suggest that you treat for them at the first sign of their damage as to limit the amount of work that you will have to do.

Thanks for reading everyone!


Rollier's Hardware

Phone: 412-561-0922


Address: 600 Washington Road
Mt. Lebanon, PA 15228


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