Just because there are a lot of grubs, or not a lot of grubs, in a particular square foot doesn’t mean that the entire lawn either does or doesn’t have a grub infestation. Replace the grass you’ve cut in short order to avoid any damage to the lawn.ĭepending on the size of your lawn, you may want to scout for grubs in several places in the lawn.Finding a few grubs is normal and not cause for concern. If you count 10 or more grubs per square foot, you have a serious infestation. Sift around in the soil, simply counting how many grubs you find.If there is significant grub damage, the grass should peel up quite easily. Peel up a one square-foot section of grass and soil from that cut.Using a shovel or a lawn edger, you can make a cut in a one-foot section of your lawn where you suspect grub activity.The only way to be sure that you have grubs is to scout for them in your lawn. In the early spring, for example, many homeowners suspect grub damage because of the condition of their lawn after snow melt. Many lawn issues that resemble grub damage can be caused by something else, including disease, drought stress, hairy chinch bugs, sod webworms, shade, compaction, and more. That all said, if you do have grubs and animals are digging for them in the lawn, that can be detrimental to the health of your turf and to the appearance of your yard. These animals feed on other insects in the lawn, like earthworms, which are beneficial to the health of the lawn. This isn’t a reliable clue, however, because grub infestations aren’t always accompanied by animal damage and animal damage doesn’t always result from a grub infestation. What we often hear from homeowners is that they believe they have grubs because animals like moles, skunks, crows and racoons are digging in the lawn. Often times grub damaged grass will pull out very easily at the roots. Healthier grass can tolerate more grub feeding, and all grass can tolerate some grub feeding.Ī grub infestation will cause patches of thinning turf, and these patches will gradually increase in size. Grubs, which are the larval, or immature, stage of several species of beetles and chafers, can damage a lawn by feeding on the roots of your grass. This blog, accompanying a live video we produced in the field, addresses some of the common questions we get at the UNH Extension Infoline about grubs. More often than not, people are surprised at how much there is to learn about grubs, and how many misconceptions there are about them and the damage they can do to lawns. For many homeowners, grub control products are an important part of the annual lawn care routine. After fertilizer and grass seed, grub control products are typically the most prominently displayed and commonly stocked lawn care product at garden centers.
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