12/8/2023 0 Comments Milky spore application time![]() The presence of white grubs in lawns is also attractive to raccoons and skunks, which will dig up lawns in searching of grubs, often causing more damage than produced by the insects alone.Īdult stages of white grubs are known as scarab beetles (Coleoptera: Scarabaeidae). Lawn areas can be killed by these injuries. In severe infestations turf roots are so severely pruned that areas of the lawn can be lifted or peeled back easily, as if it had been newly laid sod. Injury to plants occurs as the white grubs feed on roots, which causes drought stress due to the root loss. White grubs are the most damaging insects in that occur in Colorado, and native species have long been particularly common in the TriRivers counties and in towns along the Arkansas and South Platte River valleys. Normally they will be seen to curve their bodies into a distinctive C-shape and grubs of the larger Colorado species may reach nearly 1 inch long. The body is creamy white with a reddish-brown head and they have three pairs of legs on the thorax. White grubs feed on the roots of grasses and usually can be found within the top couple inches of soil. Photo by David Shetlar, The Ohio State University. From left to right: eggs, 1st stage grub, 2nd stage grub, 3rd stage grub, pupa, adult. These are larvae of the bumble flower beetle, which develop in compost and animal manure.įigure 6: Life stages of a masked chafer. Photo by David Shetlar, The Ohio State University.įigure 5: Most white grubs in Colorado do not damage plantss. Photo by David Shetlar, The Ohio State University.įigure 4: Damage to turfgrass caused by skunks or raccoons digging for white grubs. Photo by David Shetlar, The Ohio State University.įigure 3: Damaged sod pulled back to expose white grub larvae. Photo by David Shetlar, The Ohio State University.įigure 2: White grub in root zone of a lawn. Photo by David Shetlar, The Ohio State University.įigure 1b: Billbug larva. Both groups of insects feed below ground and damage roots or feed within the growing crown area of the plant. White grubs and billbugs can be important pests of turfgrass in parts of Colorado. Lawns that are adequately watered and in good condition can often tolerate much of the injury caused by these insects.Insect parasitic nematodes are a biological control option for both white grubs and billbugs.Billbugs are best controlled when adults are present on the surface of the lawn in spring.White grubs are best controlled with insecticides when eggs are beginning to hatch.Heavy infestations of white grubs may kill grass or attract mammals, such as skunks, that damage grass when digging to feed on grubs.Billbugs and white grubs are insects that damage turf grasses by feeding on the roots.Mite Problems Are A Thing of the Past, Unless. ![]()
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