Grub Signs
A good sign that grubs are present, is the digging up of the turf by raccoons, skunks and in the south by armadillos. Generally areas that are more heat and drought stressed will often show grub symptoms. These areas are often in full sun, and have a south-facing slope. Turf that is well-drained, moist, and have high organic matter are especially susceptible.
Another sign of grub damage is what looks like drought conditions in the lawn. These areas may also have a number of broadleaf weeds.
Grub damage is easily determined by pulling back the sod. If the turf pulls back easily as if to lift pieces of sod, this is often grub damage. Grubs feed on the roots at the thatch/soil interface, which results in the turf being easily “peeled back”. Often times the grubs will be present where the sod has been removed. If the soil is dry, digging down a short distance may reveal the grubs.
Grub damage occurs primarily in the north on Kentucky bluegrass and fine fescue turf. It can also occur on the other cool season turfgrasses including the endophytic containing perennial ryegrasses.
Soil Temperature Map
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