Putting tarpaulin down on a surface sweats them out and they come to the surface and you sweep them off. This material is based upon work supported by the USDA and the National Institute of Food and Agriculture award number(s) 2014-70006-22498. Always wear rubber gloves and rubber boots when applying insecticides to turfgrass. To kill existing grubs, you've got two chemical choices. Regionally, European chafers are a much bigger problem than they used to be. For some, a lush green lawn is a crowning achievement. For a long time, the most common way to treat these grubs was a pesticide spray. These are most likely the larvae of European chafers if they are found in lawns without an irrigation system. Adult beetles typically lay their eggs in June or July and, by August, those eggs hatch into larvae. European chafer grubs may be found in all locations in Michigan’s Lower Peninsula and in much of the Upper Peninsula. It will take 10-14 days for the grubs to begin dying after the insecticide is applied. If you select a product that contains imidacloprid ingredient to kill larvae will be the best choice. Mowing prior to making the application will avoid this problem by removing the flowers. The lifecycle of a chafer grub is illustrated right and explains that the most effective time to apply nematodes will be between mid-July to mid-October, when larvae are large enough to encounter the nematode, aren't a significant issue in turf, but before soil temperatures are lower than 12 O C and the grubs move lower down in the soil profile. When you’ve gone through and determined for certain that you have grubs and need to treat, you can use a curative pesticide that will kill grubs almost immediately. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464). Not all the grub control products on store shelves will be effective this spring. A. Potter “has conclusively shown that the tall [fescue grasses] are much more tolerant of grub populations,” said Shetlar, who then added, “Where Kentucky bluegrass and perennial ryegrass will be damaged with … eight to 10 grubs per square foot, the tall fescues usually require somewhere around 12 to 14 grubs per square foot” before showing damage. They spend the winter as large grubs (0.75 inches long) some 2-6 inches below the soil surface. Unlike European chafer beetle grubs, rose chafer grubs do not harm turf grassroots. There are two chemicals, carbaryl and trichlorfon, that are considered curative treatments. During the late summer and early fall, you may begin to notice lawns turning an unattractive shade of brown in certain unsightly, dying patches. Granted, it sounds like something out of a horror film but the fact is, it works. Professor Daniel. Finding one or two grubs does not indicate you need to apply a grub control product. For more information, visit https://extension.msu.edu. Carefully check the label for ingredients. If you are applying a product containing clothianidin, thiamethoxam or imidacloprid, the lawn should be mowed prior to the application so that no weeds are flowering in the lawn when the insecticide is applied. Shetlar added, “If there are four to five grubs per square foot, that’s usually enough for them to be digging around.”. 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. If you have treated for several years and you do not see evidence of grubs in your lawn or in the neighbor’s lawn, it may be time to stop treating. In Canada, it is a problem in Ontario and Vancouver, so Washington State is on the lookout for it also. But what are the most effective options for sustainable-minded lawn owners? European chafers can devastate a lawn with little warning because the adult beetles fly at dusk when they emerge in June and early July, and can easily be overlooked because their evening flight to mate and lay eggs occurs after sunset. 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). If you confirmed grub damage the previous fall or spring, meaning you found lots of grubs, then you may want to use a preventive insecticide for one or two years to build a more dense turf that will be tolerant of grubs. By: Julie Slezak 21 September, 2017. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. In addition, grub control products that contain the active ingredient chlorantraniliprole are safe for bees, even when weed flowers are sprayed. But it can get worse: Large urban and suburban critters, such as skunks and raccoons, are apt to claw up your entire lawn looking for them, considering them hard-to-come-by delicacies. Once grubs are established, what can you do about it? The standard, and highly effective, grub control insecticides are products that contain imidacloprid, clothianidin or thiomethoxam. Dylox and Sevin are the products to choose from. Here’s how to choose and use the right one for your lawn. They are preventive products that work very well on newly hatched grubs present in July, but do not work well for large grubs found from September to May. Although the bag often says apply anytime from May to Aug. 15, it is highly recommended that products containing imidacloprid, thiamethoxam, clothianidin be applied and irrigated into the soil in June or July. 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. Here are our picks for the best grub killers. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. If it’s still firmly rooted, then you have another problem, such as brown patch or dog urine damage. “It’s irrelevant which species it is,” advised Shetlar. Follow this blog to stay tuned with what you need to keep your lawn in tip-top shape year-round. Our research indicates they will kill 20-80% of grubs when applied in September or 20-55% when applied in late October. There is a widely sold trade name called Triazicide from Spectrum that lists grubs on the label and states it will control insects above or below ground and has a picture of a grub on the front of the bag. “You can typically get 60% to 100% control with the nematodes when they’re used at the right time in the right way.”. Japanese beetle grubs also feed on turf roots in home lawns, but they are not usually as much of a problem on home lawns as European chafers can be. As seen in Forbes, CNBC and USA Today, LawnStarter lets makes it easy to schedule service with a local lawn care professional. “The typical damage usually seen here is something that looks like drought stress usually,” Shetlar said. Do not treat your garden or lawn with chemicals that will kill natural enemies such as ants, ground beetles, scoliids, and tiphiids. This is most effective between July and October when the chafer grubs are most active. Effective insecticide control products against grubs include imidacloprid, thiamethoxam and clothianidin. Natural Solutions for Killing Grubs & Beetles. Imidacloprid (trade name, Merit) is used for chemical control, but it has limited effectiveness. Healthy turf with a few grubs may not need an insecticide. He also mentions research from a University of Kentucky entomologist suggesting you should choose one species of turfgrass over another. Cultural: Spike-aeration of turf may kill significant portions of white grub populations when they are feeding close to the soil surface (approximately 45 days after beetles appear). These products are used to prevent future grub problems, not to control the grubs present in the lawn in the spring. These chemicals kill the grubs immediately. “In that case, they work quite well,” he said. By the end of October, they are fully grown. He’s also co-author of the comprehensive guide “Garden Insects of North America,” plus other pest management tomes including “Managing Turfgrass Pests.”. Always follow label directions carefully when using any chemical pesticide. Next, you can keep the area moist enough to keep the earthworms alive, but dry enough to repel grub worms. *What is 0.5 inches of irrigation? The second major concern is to make sure the insecticide is thoroughly watered into the ground with at least a half-inch of irrigation or rain immediately after the chemical is applied. However, Shetlar did let on that the most experienced organic lawn care professionals may have the knack for using them effectively against white grubs. 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. Lawn sprinklers can be used if you do not have an irrigation system. These natural predators may help control the problem. Water the lawn immediately after applying the insecticide. Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. 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. Like anything else in lawns and gardens, white grubs are a force of nature. European chafers are generally found in drier turf and their population levels will fluctuate depending upon how wet or dry the weather was the previous summer. The grubs of economic importance in North Carolina are those of the Japanese beetle, the green June beetle, the southern masked chafer, the northern masked chafer, and the Asiatic garden beetle. When your lawn is brown and patchy, grubs could be the cause. ... Chemical control. The most common (and, sadly, most effective) ways to kill grubs are chemical insecticides. 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. It contains only lambda-cyhalothrin or gamma-cyhalothrin. They are bigger than the adult beetles and, if straightened out, can be up to 18mm (almost ¾in) long; Chafer grubs, dung beetles and stag beetles all have similar looking grubs. I would first try nematodes - there is a specific type for chafer grubs and one for leather jackets. Protecting bees and other pollinators. Currently, there are no approved insecticides for the control of chafer grubs; although, in 2018 and 2019 emergency authorisation of Syngenta insecticide Acelepryn was approved for the control of chafer grubs and leatherjackets. Another ingredient is imidacloprid, which is in use to make grubs killer products. Beneficial Insects for Your Lawn and Garden, Go, Spot, Go: 5 Myths About Dog Urine Spots on Lawns, How to Spray Lawns for Weeds, Safely and Effectively, Composting 101: How to Start Your First Compost Pile, Companion Plants That Love Your Lawn (and Vice Versa), Natural Weed Killers: A Guide to Organic Herbicides, 2021’s Best and Worst States for Living Off the Grid, 10 Walkway Ideas for Your Yard and Garden, 14 Treehouse Ideas for Your Backyard Playhouse. Products containing imidacloprid, thiamethoxam, clothianidin or chlorantraniloprole will not control grubs in the spring. However, they only work if used in the lawn in June and July. If the need should arise to use a curative compound, make sure to keep the infested lawn watered and fertilized and treat the area again with a preventive application the next summer or the problem will likely reoccur in the fall or the following spring. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. If you wait until August when the brown patches appear, it’s too late. One way to mitigate the damage: Mow your lawn just before applying so there are no weed flower heads to attract the pollinators to your temporarily poisoned yard. Masked chafer grubs feed on the roots of turfgrass. Milky spore is a spreadable bacteria known as Bacillus popilliae that can be used … There is one insecticide product in a different chemical class that will give a similar level of grub control: chlorantraniliprole (Acelepryn). Do not use products containing ONLY lambda-cyhalothrin, gamma-cyhalothrin, bifenthrin, deltamethrin, cyfluthrin or permethrin for grub control. The grubs get their start when the adult beetles lay eggs in your turf, usually in spring. Applying them now will allow some of the chemical to leach through the turf or break down to the point that not enough insecticide will be there in July to control grubs. Safe for use on all types of grass and ornamentals. However, if the grub population is high or if there is a history of damage in an area, it may be necessary to consider using an insecticide for grub control. If there is nothing flowering in the lawn, there is nothing in it that would attract bees. The other is Sevin (carbaryl). Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. “I emphasize a lot — especially to lawn care and sport field managers — [to try] to keep the thatch down to a minimum,” Shetlar said. The most definitive way to check for an infestation is to pull the grass back and physically check for the beetles. 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 cause the same kind of damage.”. Do not apply any curative compounds in the spring after May 15 as grubs stop feeding in late May as they prepare to pupate. It’s when these “de-thatcher” populations grow out of control that the dreaded lawn damage takes place. Mow lawns immediately before applying an insecticide for grubs to remove weed flowers and protect bees. Hosts. GrubEx with the active ingredient chlorantraniliprole is used for preventive soil... 2. 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 get the best result, you have to apply this product in between July and August. 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