Current research also shows that watering with 0.5 inches of irrigation immediately after the application is essential to get effective results from these insecticides. Proper fertilization is important to prevent and allow the lawn to recover from grub damage. However, adult European chafers do not eat at all and so are not the problem defoliators that Japanese beetles are. Follow this blog to stay tuned with what you need to keep your lawn in tip-top shape year-round. The adults of white grubs are commonly Japanese Beetles, May/June beetles or a type of chafer.The larva (grub stage) are detritivores, but can damage lawn and garden areas by feeding on plant roots. These are most likely the larvae of European chafers if they are found in lawns without an irrigation system. Check out the MSU Turfgrass Management - Golf Course Certificate Program! Several other species, such as May beetles and June beetles, are also present but usually in low numbers. There is another active ingredient in some insecticides called chlorantraniliprole that will also work in preventing grub problems, but it is less water soluble than the other preventive compounds mentioned above, so it can be applied any time after the grass turns green in the spring. Here’s a good test, from the University of California Integrated Pest Management Program: Pull up about 1 square foot of the earth around the base of your sod (where the stems meet the roots). We don’t seem to be getting as many calls about lawns damaged by Japanese beetle grubs in the southern half of the Lower Peninsula, south of Lansing, but we are getting more calls from the northern Lower Peninsula as Japanese beetles continue to spread northward. In fact, the damage from these animals alone may be the bigger issue to prevent. Unlike European chafer beetle grubs, rose chafer grubs do not harm turf grassroots. GrubEx with the active ingredient chlorantraniliprole is used for preventive soil... 2. The two types of curative pesticides you can use are carbaryl and trichlorfon (sold under the brand name Dylox). By the end of October, they are fully grown. When talking about the maximum threshold of tolerance for grubs, “I always chuckle about [checking the threshold], in that skunks and raccoons haven’t read about this threshold.”, As such, it may be worthwhile for homeowners to be just a little warier on account of skunks and raccoons. Carefully check the label for ingredients. The standard, and highly effective, grub control insecticides are products that contain imidacloprid, clothianidin or thiomethoxam. Make sure to irrigate the lawn with at least. They will not work on grubs found in the lawn from the middle of October through the middle of May. Home lawns, golf courses, and turf growers have the potential to be most significantly impacted if the European chafer beetle were to become established in … They are not as effective as the preventive compounds in reducing grub numbers. “I emphasize a lot — especially to lawn care and sport field managers — [to try] to keep the thatch down to a minimum,” Shetlar said. Their active ingredients are trichlorfon, clothianidin, and carbaryl. Some of it manifests as dry and deadened looking patches in your lawn. “But the problem is, [if] they’re eating that thatch, they do eat the roots and the crowns [of turfgrass], which kills the plant.”. However, they only work if used in the lawn in June and July. There is an erroneous philosophy being perpetuated that because we have European chafers and Japanese beetles in the area, it is necessary to treat every year or your lawn will be damaged by grubs. They can be abundant in non-irrigated home lawns if we receive frequent rain in July, but are scarce in lawns that are very dry in July and early August. Do not treat your garden or lawn with chemicals that will kill natural enemies such as ants, ground beetles, scoliids, and tiphiids. Part of this difference may occur because the European chafer spends a longer portion of the summer feeding on turf. Check the active ingredients. Also, in the last two years several products have become available in an attach-to-hose bottle and are automatically mixed with water when applied. After the eggs hatch, the grubs evolve in three stages, with grub damage greatest in late summer, when you will see areas of your lawn thinning and yellowing. He’s also co-author of the comprehensive guide “Garden Insects of North America,” plus other pest management tomes including “Managing Turfgrass Pests.”. Wisconsin, Minnesota and Iowa have now joined the club of Midwest states with lots of Japanese beetles, and they have been found in isolated locations as far west as Colorado. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. Preventive products containing imidacloprid, thiamethoxam or clothianidin will consistently reduce 75-100% of the grubs if they are applied in June or July and if they are watered-in with 0.5 inches of irrigation immediately after application. Short on time and just want to kill some grubs? Although grubs are a common pest of lawns, they sometimes end up in gardens adjoining patches of grass. Now it has spread throughout Ohio, Michigan (all of the Lower and half of the Upper Peninsula), northern Indiana and into eastern Illinois. It was also reported in Wisconsin in 2013. 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