If applied in early spring, the pesticide may move through the soil or partially degrade by the time the grubs hatch in late July. Both compounds work equally well on Japanese beetle grubs. For a long time, the most common way to treat these grubs was a pesticide spray. 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. 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. Proper fertilization is important to prevent and allow the lawn to recover from grub damage. Add one quart of warm water and one tablespoon of liquid soap. They are not as effective as the preventive compounds in reducing grub numbers. Try a synthetic pesticide for all grubs. Non-Toxic Lawn Grub Killers. Is there anything more damaging (or, in some peoples’ eyes, revolting) than grubs in your lawn? What about those common organic recommendations for killing lawn grubs online, such as milky spore disease or beneficial nematodes? The nematodes (small numbers of which are naturally present in soil) will kill the grubs without unbalancing the soil ecosystem like chemical … Putting tarpaulin down on a surface sweats them out and they come to the surface and you sweep them off. 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. 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. The European chafer is a very serious grub pest of turf and can cause more turf damage than the Japanese beetle. The grubs get their start when the adult beetles lay eggs in your turf, usually in spring. He also mentions research from a University of Kentucky entomologist suggesting you should choose one species of turfgrass over another. These two insecticides are the only options if high numbers of grubs are found in the fall and in spring before early May. 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. Consider carefully whether it would be best to wait and apply a preventive later. The grubs feed from the beginning of August until late October. Our research indicates they will kill 20-80% of grubs when applied in September or 20-55% when applied in late October. They have stout white bodies curved in a C shape, light brown heads, with three pairs of legs at the head end. 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. These products are used to prevent future grub problems, not to control the grubs present in the lawn in the spring. The most common (and, sadly, most effective) ways to kill grubs are chemical insecticides. This is not true. ... Chemical control. Another ingredient is imidacloprid, which is in use to make grubs killer products. It is important to realize that healthy turf, supported by frequent rain or irrigation, can support a grub population of five or more grubs per square foot with no visible turf damage. “You can typically get 60% to 100% control with the nematodes when they’re used at the right time in the right way.”. It’s when these “de-thatcher” populations grow out of control that the dreaded lawn damage takes place. Show your Spartan pride and give the gift of delicious MSU Dairy Store cheese this holiday season! Effective insecticide control products against grubs include imidacloprid, thiamethoxam and clothianidin. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. Check out the MSU Turfgrass Management - Golf Course Certificate Program! “White grubs are eating the accumulated thatch and organic matter that’s in the top inch of the soil profile. They are not cheap but will treat the problem at source. 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. How to Control Grub Worms in the Garden. In fact, the damage from these animals alone may be the bigger issue to prevent. Few admire their looks. He’s also co-author of the comprehensive guide “Garden Insects of North America,” plus other pest management tomes including “Managing Turfgrass Pests.”. 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. Always follow label directions carefully when using any chemical pesticide. This information is for educational purposes only. The profusion of different products can be rather mystifying. “They cause the same kind of damage.”. If you notice more than 6 grubs in this space, it’s a good time to consider preventive methods or treatments to reduce overpopulation. 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. 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. The label lists the legal rate at which the product can be used. This article was published by Michigan State University Extension. The chafers (or Maybugs) produce the largest grubs, up to 5cm (2in) long. Once grubs are established, what can you do about it? Use them in June or July to control grubs that would be damaging turf in the fall. The two types of curative pesticides you can use are carbaryl and trichlorfon (sold under the brand name Dylox). 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. This material is based upon work supported by the USDA and the National Institute of Food and Agriculture award number(s) 2014-70006-22498. Make a regular practice of mowing your yard with the mower on the highest setting (3.5-4 inches). Later, irregular brown patches appear in your turf. Mix well and spray it on the affected area immediately. May 22, 2020. 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. 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. Check the bag or bottle to determine what active ingredient the product contains. 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. “In that case, they work quite well,” he said. Research tests over the last 25 years have clearly shown that watering immediately after application helps to obtain good results. David Shetlar is a professor emeritus with a doctoral degree in entomology at The Ohio State University. 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. 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). Preventive methods top Shetlar’s list for fighting grubs nonchemically. These natural predators may help control the problem. Garden chafer and Welsh chafer grubs are often smaller - upwards of 2cm (¾in) long. Chemical Control. 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. 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