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. Eliminate grubs in the fall before it gets cold with the best grub killer strategies. But, when is it too early to apply grub control? Our research has indicated that carbaryl has been a little more effective on European chafer grubs than trichlorfon. You cannot apply a grub preventer to kill grubs that are already damaging your lawn. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. The best time to apply grub control depends on whether you’re preventing them or killing the ones already damaging your lawn. Thank you very much for your support. Japanese beetles and European chafers lay most of their eggs in July, but Japanese beetles continue laying eggs into August. I can say I have years of experience, and I am here to share it with you. Here’s how to choose and use the right one for your lawn. 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. For best results, Season Long Grub Control Plus Turf Revitalizer should be applied anytime from mid-May through mid-August before grubs or mole crickets hatch. Use them in June or July to control grubs that would be damaging turf in the fall. Protecting bees and other pollinators. In most cases though, you’ll only need to apply grub control twice in a season – the first one being a grub killer when you see signs of infestation and the second one being a grub preventer around June and July to stop their cycle. 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 the damage continues, it is likely the grub treatment was not enough or did not work. • Water grass as soon as possible after application to move product to root zone where insects feed. When timing is done right, you’ll be able to control about 80 percent of the grubworm infestation in the next season. Grub damage may appear in home lawns from mid-September to November or from March to early May. We do not specifically market to children under 13. Additionally, Crabgrass Lawn (crabgrasslawn.com) participates in various other affiliate programs, and we sometimes get a commission through purchases made through our links. ? The product labels recommend applying 3 lbs. CrabGrassLawn is a Wiki for Lawn Enthusiasts by Lawn Experts. For more information, visit https://extension.msu.edu. As with the preventive products, lawns should be mowed immediately before applying carbaryl or trichlorfon to protect bees. Mowing prior to making the application will avoid this problem by removing the flowers. For them to be effective, water your lawn to at least 1-inch. For that, you need to apply a grub killer such as GrubEx. Hi, Alex K. here. Check the bag or bottle to determine what active ingredient the product contains. 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. Regionally, European chafers are a much bigger problem than they used to be. Not all the grub control products on store shelves will be effective this spring. 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. [When + Overseeding], Different Types of Crabgrass (With Pictures), Best Crabgrass Killer & Preventers – 2020 Reviews, When to Apply Crabgrass Preventer [ Before or After Rain & Wet Grass? Otherwise, you need to apply the insecticide between May and July to prevent infestation for the next season by killing and harming the development of the next generation of grub worms in your lawn. These products work well for above-ground feeding insects that live on the grass leaves or soil surface, but not for insects that feed on 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. The active ingredients are usually shown on the bottom right or left of the front of the bag and listed as a percent of composition. By the end of October, they are fully grown. Do not use products containing ONLY lambda-cyhalothrin, gamma-cyhalothrin, bifenthrin, deltamethrin, cyfluthrin or permethrin for grub control. Finally, avoid spray drift or granular spreader drift to flower beds when applying thiamethoxam, imidacloprid, clothianidin or any insecticide for grubs other than chlorantraniliprole. Both compounds work equally well on Japanese beetle grubs. If you want to stop grub damage immediately, the best time to apply grub killer insecticide in your lawn is as soon as you see signs of damage. Use the right rate/amount of product. Now it has spread throughout Ohio, Michigan (all of the Lower and half of the Upper Peninsula), northern Indiana and into eastern Illinois. You can measure how much irrigation is applied by putting out several coffee cups in your lawn and run the irrigation until they fill to a half-inch level above the bottom. One trichlorfon product has “24 Hour Grub Control” in its name and would seem to indicate that it will kill grubs in 24 hours. You want to get the best effects after applying the pesticide on your lawn. When is the best time to apply 24 Hour Grub Killer Plus Granules to kill grubs? Healthy turf with a few grubs may not need an insecticide. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates. The larvae of both species look almost identical. 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. When is the best time to start a treatment and what should I use. 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. Insecticides used for grubs can be separated into two groups based on how they work: preventive chemicals and curative chemicals. 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). 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. Proper fertilization is important to prevent and allow the lawn to recover from grub damage. The best time to eliminate grubs is in the early fall before it starts to get cold. The best time to apply grub control is between early spring and late summer when there’s increased grub worm activity in your lawn. Consider carefully whether it would be best to wait and apply a preventive later. Grub treatments are effective when applied at the right time. ], How to Kill Crabgrass Using Baking Soda (Steps & Side Effects), Dallisgrass vs Crabgrass – Differences [With Pictures], Steps for Killing Quackgrass With Vinegar, Crabgrass vs Quackgrass: Identification & Differences (With Pictures). Store insecticide products in a locked cabinet not accessible to children. As temperatures continue to drop with winter approaching, grubs dig down approximately 4-8 inches into the soil and lay there until temperatures start to rise again. The preventive compound chlorantraniliprole should ideally be applied in April or May to control grubs that would be damaging turf in the fall as it will take longer for the material to move to where the grubs will be feeding in July. The pesticide will easily disintegrate into the soil and lose its potency by the time the grubs hatch in July through August.