Do not apply any curative compounds in the spring after May 15 as grubs stop feeding in late May as they prepare to pupate. Grub damage may appear in home lawns from mid-September to November or from March to early May. All turfgrass species, especially annual bluegrass (a common weed in turf), Kentucky bluegrass, and perennial ryegrass. How to Apply Lime to Lawn to Kill Grubs. Non-Toxic Lawn Grub Killers. European chafer grubs may be found in all locations in Michigan’s Lower Peninsula and in much of the Upper Peninsula. Check for the active ingredient in a grub product. As with the preventive products, lawns should be mowed immediately before applying carbaryl or trichlorfon to protect bees. The blackheaded pasture cockchafer larvae tend to curl into a C-shape upon exposure or when handled, hence they are often referred to as 'curl' grubs. 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. Finding one or two grubs does not indicate you need to apply a grub control product. Our research has indicated that carbaryl has been a little more effective on European chafer grubs than trichlorfon. An online search indicates there are other products that will be available at other stores. These lawn pests tend to curl up in a “C” shape at rest. If applied too late, preventative products may not be effective as they work best on small grubs. This is not true. Research tests over the last 25 years have clearly shown that watering immediately after application helps to obtain good results. In 2002, they were only found in New York, Pennsylvania, Massachusetts, Delaware, New Jersey, Connecticut, New Hampshire, Vermont, Maryland, Southern Michigan, and eastern Ohio. His key to this: fertilizing one’s lawn with nitrogen only once per year, and doing it very strategically “and judiciously,” to quote Shetlar, “usually in late October, early November.”. These products are used to prevent future grub problems, not to control the grubs present in the lawn in the spring. Adult beetles typically lay their eggs in June or July and, by August, those eggs hatch into larvae. 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. If applied in early spring, the pesticide may move through the soil or partially degrade by the time the grubs hatch in late July. Neither of the products listed grubs on the label printed on the bag and neither of the products would have controlled grubs. Some of these products come in a granular formulation that is applied with a fertilizer spreader or some products are designed to be mixed with water and sprayed. To kill grubs in the spring or fall, use carbaryl or trichlorfon. The grubs feed from the beginning of August until late October. Part of this difference may occur because the European chafer spends a longer portion of the summer feeding on turf. There was a product available in years past from Spectrum that contained imidacloprid, but I did not see any in my visits the last two years (2016 and 2017). Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. 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. Finally, avoid spray drift or granular spreader drift to flower beds when applying thiamethoxam, imidacloprid, clothianidin or any insecticide for grubs other than chlorantraniliprole. He’s also co-author of the comprehensive guide “Garden Insects of North America,” plus other pest management tomes including “Managing Turfgrass Pests.”. 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. He also mentions research from a University of Kentucky entomologist suggesting you should choose one species of turfgrass over another. More research is needed on this, but it could cause problems for native bees or have long-term health effects on honey bees or bumble bees. Since grubs eat grass roots, the lawn will be easy to pull up in chunks. 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. David Smitley, Terry Davis and Erica Hotchkiss, Michigan State University, Department of Entomology -
Here are our picks for the best grub killers. 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 … Next, you can keep the area moist enough to keep the earthworms alive, but dry enough to repel grub worms. To kill existing grubs, you've got two chemical choices. what chemicals kill chafer grubs Not all the grub control products on store shelves will be effective this spring. Japanese beetles like to lay their eggs on irrigated turf like golf courses, athletic fields and highly maintained lawns. They live in beds and borders and feed on roots and vegetables. Mow lawns immediately before applying an insecticide for grubs to remove weed flowers and protect bees. Chafer grub treatment Your Greensleeves local lawn care expert will use our own biological insect control treatment, known as nematodes, to kill the chafer grubs. The other is Sevin (carbaryl). Consider carefully whether it would be best to wait and apply a preventive later. These worms then reproduce inside the dead grubs and a new generation is released to prey on more Chafer Grubs. However, when applied in June or July they provide excellent protection against the next generation of grubs. They grow all summer and then, go deep into the soil for resting for winter. If it’s still firmly rooted, then you have another problem, such as brown patch or dog urine damage. “But the problem is, [if] they’re eating that thatch, they do eat the roots and the crowns [of turfgrass], which kills the plant.”. They are not as effective as the preventive compounds in reducing grub numbers. Make a regular practice of mowing your yard with the mower on the highest setting (3.5-4 inches). Proper fertilization is important to prevent and allow the lawn to recover from grub damage. I found five to nine different products at each store. One trichlorfon product has “24 Hour Grub Control” in its name and would seem to indicate that it will kill grubs in 24 hours. There are many products available, some with the same active ingredients. Try a synthetic pesticide for all grubs. Nemasys G (controls chafer grubs) contain nematodes that provide the perfect biological control by entering the larvae, which stops them feeding within three days of infection. 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. The likely explanation is the grass is being destroyed by hungry, thriving grub worms living below the surface of the 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. 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. Once grubs are established, what can you do about it? “I emphasize a lot — especially to lawn care and sport field managers — [to try] to keep the thatch down to a minimum,” Shetlar said. At one garden center a clerk showed us two products, one containing only permethrin and one containing only bifenthrin, when we asked for products to control grubs. 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. In fact, most well-maintained lawns do not have visible damage from grubs. We must either tolerate them, battle them head-on, or strike a compromise with them — or, ideally, prevent their spread beforehand to reduce the risk of eventual over-infestation. This chemical consistently reduced grub numbers by about 65-80% and research has shown that applications made before June are more efficacious than June or July application. 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. A lawn should be mowed at 3 to 4 inches in height and properly fertilized for maximum root growth. The label lists the legal rate at which the product can be used. They have stout white bodies curved in a C shape, light brown heads, with three pairs of legs at the head end. If you notice more than 6 grubs in this space, it’s a good time to consider preventive methods or treatments to reduce overpopulation. This is the result of grub activity: specifically, the consequences of their nibbling on your tender, tasty turfgrass roots. 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. Another ingredient is imidacloprid, which is in use to make grubs killer products. “White grubs are eating the accumulated thatch and organic matter that’s in the top inch of the soil profile. However, even trichlorfon should not be evaluated for at least five days after application (assuming it rains or irrigation was applied), and carbaryl may need three to four weeks to be effective. Triazicide will not control grubs. The chemicals carbaryl and trichlorfon that are considered curative treatments — they are short-lived products effective immediately. Check the active ingredients. There are two chemicals, carbaryl and trichlorfon, that are considered curative treatments. Preventive methods top Shetlar’s list for fighting grubs nonchemically. Lawn sprinklers can be used if you do not have an irrigation system. Use Milky Spore. The larvae of both species look almost identical. Their active ingredients are trichlorfon, clothianidin, and carbaryl. “In that case, they work quite well,” he said. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. mowing your yard with the mower on the highest setting. 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. This is most effective between July and October when the chafer grubs are most active. Other chafer species besides the masked chafer beetles (like the European chafer) also lead to white grub infestations and can establish in lawns beyond the state’s borders. As for beneficial nematodes, Shetlar said, “There’s a very steep learning curve to using the insect parasitic nematodes.” They can only be effective when used curatively, and even then, only on small affected areas. Later, irregular brown patches appear in your turf. 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. But how do you know if you have a real lawn grub problem? It contains only lambda-cyhalothrin or gamma-cyhalothrin. “It’s irrelevant which species it is,” advised Shetlar. Few admire their looks. Do not use products containing ONLY lambda-cyhalothrin, gamma-cyhalothrin, bifenthrin, deltamethrin, cyfluthrin or permethrin for grub control. That’s the Japanese beetle and the masked chafer,” said Shetlar about his home turf. The grubs get their start when the adult beetles lay eggs in your turf, usually in spring. This product contains microscopic worms called Entomopathogenic Nematodes which prey on Chafer Grubs, infecting them with a fatal bacteria. How Do I Treat a Chafer Beetle Infestation? For a one-two punch that can deter adult beetles and grubs, mix two cloves of chopped garlic with one tablespoon of mineral oil, and allow that to sit in the freezer overnight. Garden chafer and Welsh chafer grubs are often smaller - upwards of 2cm (¾in) long. The chafers (or Maybugs) produce the largest grubs, up to 5cm (2in) long. They are not cheap but will treat the problem at source. Use them in June or July to control grubs that would be damaging turf in the fall. During the late summer and early fall, you may begin to notice lawns turning an unattractive shade of brown in certain unsightly, dying patches. “In many cases, grubs aren’t even discovered until the skunks and raccoons start digging them up,” said Shetlar. Is there anything more damaging (or, in some peoples’ eyes, revolting) than grubs in your lawn? The eggs of both species hatch about 10 days after they are laid. Store insecticide products in a locked cabinet not accessible to children. Short on time and just want to kill some grubs? There are two chemicals, carbaryl and trichlorfon, that are considered curative treatments. Free Shipping … Weeds that flower again after mowing are much safer than weed flowers that were sprayed directly with insecticide, but some of the insecticide is absorbed by the roots and will move into the pollen and nectar. Effective insecticide control products against grubs include imidacloprid, thiamethoxam and clothianidin. Add one quart of warm water and one tablespoon of liquid soap. For a long time, the most common way to treat these grubs was a pesticide spray. Chlorantraniliprole can be applied as early as April and up to mid-July. This information is for educational purposes only. Mix well and spray it on the affected area immediately. Bayer Advanced 700740S 24 Hour Grub Killer Plus, Granules & Bayer Grub Control, Spray. They are short-lived compounds that kill all life stages of grubs. Below is a short list of products now being sold for grub control as of May 22, 2020, in stores checked in the Mid-Michigan area. The most common (and, sadly, most effective) ways to kill grubs are chemical insecticides. I would first try nematodes - there is a specific type for chafer grubs and one for leather jackets. 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. Make sure to irrigate the lawn with at least. Preventive controls include the neonicotinoids and chlorantraniliprole, but the timing for each approach is very different.The label directions for most neonicotinoids (products containing chlothianidin, imidacloprid, or thiamethoxam) indicate they should be applied \"when females are laying eggs\". 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. The standard, and highly effective, grub control insecticides are products that contain imidacloprid, clothianidin or thiomethoxam. *What is 0.5 inches of irrigation? Now it has spread throughout Ohio, Michigan (all of the Lower and half of the Upper Peninsula), northern Indiana and into eastern Illinois. As an extra integrated control measure, there is now evidence that treating the affected lawn or turf with a slow release, nitrogen based fertiliser containing calcium cyanamide, aids recovery of chafer damaged lawns and turf by the metabolites damaging the chafer grub larvae such Amvista Chafer Special. Bayer Advanced Season-Long Grub Control (or Bayer Advanced Merit) - Granular, Bayer Advanced Season-Long Grub Control and Turf Revitalizer - Granular, Premium Grub Control (Do not confuse with “Premium Insect Control”), Bayer Advanced Complete Insect Killer Liquid attach-to-hose-bottle, Bayer Advanced Complete Insect Killer Granules - Granular, Bayer Advanced 24 hr Grub Killer Plus - Granular, Spectracide Triazicide Insect Killer for Lawns - Granular. Safe for use on all types of grass and ornamentals. Lawn grubs can be present in your lawn but cause absolutely no problems. There are also products for sale that list grubs on the label that do NOT work for grubs. The critical issue with any grub control product is the active ingredient. “They’re sort of nature’s ‘de-thatchers,’” he added. * Editorial Note: LawnStarter may receive a commission if you purchase certain products mentioned in this article. 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. EMERGENCY AUTHORISATION for Acelepryn offers the potential to control economically damaging infestations of chafer grubs and leatherjackets, from accurate timing and treatment at egg laying - to target larvae at early 1st and 2nd stage instars. Always follow label directions carefully when using any chemical pesticide. It is suspected that the spread of AGB is due to imidacloprid overuse: the chemical kills the other grub species and allows the expansion of this one. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464). 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. Biological, granulated insecticide is a great non–chemical choice to control grubs found in lawns. For more information, visit https://extension.msu.edu. 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. These are most likely the larvae of European chafers if they are found in lawns without an irrigation system. Natural Solutions for Killing Grubs & Beetles. Chemical Control. When the ground warms up in spring, they resume feeding and can cause damage from the time the grass turns green until they pupate in mid-May. However, they are more effective when the grubs are younger and living near the surface than when they are bigger and situated deeper. By the end of October, they are fully grown. Show your Spartan pride and give the gift of delicious MSU Dairy Store cheese this holiday season! 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. 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. Shetlar chuckled brightly when asked if lawn grubs, commonly called “white grubs,” play a positive part in a lawn’s “ecosystem.” “Everybody says grubs eat the grass roots,” he said, but there’s more to them than that. 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. Not all the grub control products on store shelves will be effective this spring. 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. These active ingredients can be toxic to bees if the bees visit flowers that were recently sprayed. Unlike European chafer beetle grubs, rose chafer grubs do not harm turf grassroots. They spend the winter as large grubs (0.75 inches long) some 2-6 inches below the soil surface. ... are known for their ability to develop resistance to synthetic chemicals and some pesticides may be non-specific and kill beneficial insects. Reducing your organic matter is certainly a way forward and there is evidence to say if you roll the surface heavily you will kill off chafer grubs. However, adult European chafers do not eat at all and so are not the problem defoliators that Japanese beetles are. 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. Regionally, European chafers are a much bigger problem than they used to be. Japanese beetle grubs are widespread invasive insects, and their white grub larvae are bound to be found in lawns all over the country too, not just Ohio. There are a lot of cultural methods you can use, particularly to get leatherjackets up. Damage. Get easy-to-understand, actionable yard tips that will give you the greenest grass on the block. 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. They will not work on grubs found in the lawn from the middle of October through the middle of May. David Shetlar is a professor emeritus with a doctoral degree in entomology at The Ohio State University. While there are variations depending on which species of beetle they come from, the larvae tend to be stout, white-to-grayish with brown heads, about 3/4 of an inch to 2 inches in length. These natural predators may help control the problem. White grubs are the larvae of scarab beetles. Healthy turf with a few grubs may not need an insecticide. Bayer offers two products... 3. Products containing only these ingredients will not work for grub control because the active ingredient binds with organic material and will not move down to where the grubs are feeding. A half-inch of irrigation is when lawn sprinklers are run until a container like a coffee mug, or several mugs, fills to a level 0.5 inches up from the bottom of the cup. 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). It’s when these “de-thatcher” populations grow out of control that the dreaded lawn damage takes place. The nematodes (small numbers of which are naturally present in soil) will kill the grubs without unbalancing the soil ecosystem like chemical … They too like roots but restrict themselves to lawns. 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. Shetlar added, “If there are four to five grubs per square foot, that’s usually enough for them to be digging around.”. 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