To kill grubs in the spring or fall, use carbaryl or trichlorfon. The standard, and highly effective, grub control insecticides are products that contain imidacloprid, clothianidin or thiomethoxam. If applied too late, preventative products may not be effective as they work best on small grubs. Dave Smitley, Michigan State University Extension, Department of Entomology - Preventive products are the most effective. 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. Scotts GrubEx kills 25% more grub types versus original Grubex. There is one insecticide product in a different chemical class that will give a similar level of grub control: chlorantraniliprole (Acelepryn). The bacterium in this product will only infect Japanese beetles and not any other species of grubs, while the most damaging grub to Michigan lawns is the European chafer. MSU is an affirmative-action, equal-opportunity employer. Our research has indicated that carbaryl has been a little more effective on European chafer grubs than trichlorfon. I went to several of the local lawn and garden centers in the Lansing, Michigan, area to see what kinds of products are available that specifically claim they will work to control grubs. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. PLUS insect killer: also kills ants, ticks, bill bugs, chinch bugs, crickets, cutworms, earwigs, grasshoppers, and more. This information is for educational purposes only. These two insecticides are the only options if high numbers of grubs are found in the fall and in spring before early May. Check out the MSU Sports & Commercial Turf Management Certificate Program! 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. How Late Can I Put Down Grub Control? 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. Healthy turf with a few grubs may not need an insecticide. Lack of efficacy of in-vivo and putatively in-vitro produced Paenibacillus popilliae against field populations of Japanese beetle (Coleoptera: Scarabaeidae) grubs in Kentucky. Our results so far agree with the results of a test conducted a number of years ago in Kentucky by C.T. 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. However, for low-maintenance lawns, even if the turf is not killed from grub feeding, the thinned and weakened turf may be prone to weeds and drought stress. Sometimes the best offense is the best defense. The first two are Heterorhabditis nematode products and the third a business that sells Heterorhabditis nematodes. However, Japanese beetles could become common in Petoskey over the next 10 years. I will put grubex down next spring as a preventer, I just needed something to kill the grubs now. Curatives are used in the spring to target adult grubs. There are different recommended timings for application depending on the active ingredient. By the time damage is … Our customers are looking for alternatives to the chemical options (especially with the publicity concerning honeybees) and I am hoping to help them find some. Scotts GrubEx Grub Killer and Preventer . Redmond, C.T. The product’s effects lasts for up to four months. Neither of the products listed grubs on the label printed on the bag and neither of the products would have controlled grubs. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. Check for the active ingredient in a grub product. Granular vs Liquid Grub Killer; Grub killer vs grub preventer; ... GrubEx is made using the active ingredient called chlorantraniliprole. By the end of October, they are fully grown. I found five to nine different products at each store. Carefully check the label for ingredients. Before doing anything, it is important to make sure the problem is grubs. Our research indicates they will kill 20-80% of grubs when applied in September or 20-55% when applied in late October. The grubs feed from the beginning of August until late October. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. setting your lawn mower at the highest clipping height, returning grass clippings and chopped leaves to the lawn. In the last 10 years, the amount of European chafer damage to home lawns in … Here’s how to choose and use the right one for your lawn. Always wear rubber gloves and rubber boots when applying insecticides to turfgrass. I received this email question about alternative grub control insecticides. Potter. Apply chlorantraniliprole early (in April or May) for summer and fall grub control. … 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. 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. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. It contains only lambda-cyhalothrin or gamma-cyhalothrin. Chlorantraniliprole applied in April will not work on spring grubs that are already present when it is applied. Annual bluegrass weevils (larvae and adult), armyworms, chinch bugs, cutworms, sod webworms, white grubs. 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. Consider carefully whether it would be best to wait and apply a preventive later. Easily apply with a Scotts broadcast, drop, handheld, or Wizz … This also moves the chemical off the grass and will make the yard safe for children, pets and wildlife after the yard is dry. vs. They will not work on grubs found in the lawn from the middle of October through the middle of May. This is a highly effective systemic insecticide that kills the target pests by both contact and ingestion. Michael WillsonWillson's Garden CenterPetoskey, MI 49770. A single application of Scotts GrubEx stops A single application of Scotts GrubEx stops grubs all season long. Time for me to put down my grub control but in the process I found out some key important information. Make sure to irrigate the lawn with at least. There is little benefit to exceeding this rate, and doing so is also illegal. One is the chemical approach. 88: 846-854. You can do this by following Michigan State University Extension’s recommendations of setting your lawn mower at the highest clipping height (3-4 inches); applying at least 2.5 pounds of actual N per 1,000 square feet of lawn per year using a slow-release fertilizer several times each year; watering during dry periods; and returning grass clippings and chopped leaves to the lawn instead of collecting and removing them. 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