If you see a dead patch, use a shovel to dig up a few Frisbee-size samples of turf around the bare spot to a depth of 2 inches and look for 0.75-inch long, C-shaped white grubs. Check for the active ingredient in a grub product. If customers ask about the safety of standard neonicotinoid grub control products (imidacloprid, clothianidin and thiomethoxam) for honey bees and pollinators, you can tell them that if the lawn is mowed before the insecticide is applied that it will be safe for honey bees because no open flowers (flowering weeds) will be present when the lawn is treated. Granular vs Liquid Grub Killer; Grub killer vs grub preventer; ... GrubEx is made using the active ingredient called chlorantraniliprole. Dylox is one of the more potent and toxic insecticides, and it's not labeled for use on edibles. It was considered to be a successful effort because populations of Japanese beetle decreased 10-fold or more at most sites within five years of when the spore powder was distributed. Chemical Action and Usages: Dylox is an organophosphate insecticide in a granular form for use on lawns to control mole crickets, sod webworms, cutworms, grubs and other listed insects in turf. Finding one or two grubs does not indicate you need to apply a grub control product. In 2002, they were only found in New York, Pennsylvania, Massachusetts, Delaware, New Jersey, Connecticut, New Hampshire, Vermont, Maryland, Southern Michigan, and eastern Ohio. 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. 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. 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. Unfortunately, there are not any biological control products that you can purchase at the garden center that will give the same level of control as the standard insecticide products. Use specified dosage of DYLOX 420 SL â¦ This article was published by Michigan State University Extension. MSU is an affirmative-action, equal-opportunity employer. Hereâs how to choose and use the right one for your lawn. 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. However, when applied in June or July they provide excellent protection against the next generation of grubs. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. If rub worms are already coming for the lush lawn, using a grub worm preventer like Scotts GrubEx Killer and Preventer will keep them at bay. Japanese beetles like to lay their eggs on irrigated turf like golf courses, athletic fields and highly maintained lawns. The best alternative strategy to avoid grub damage is to improve your turf management practices to establish a dense root system in your lawn. European chafer grubs may be found in all locations in Michigan’s Lower Peninsula and in much of the Upper Peninsula. Curatives are used in the spring to target adult grubs. 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. We have had questions from our customers at our garden center here in Petoskey about the Milky Spore granular product by St. Gabriel Laboratories and I am having a hard time getting the facts. The first two are Heterorhabditis nematode products and the third a business that sells Heterorhabditis nematodes. Lawns with a large, dense root system are much less likely to be damaged by grubs, and it is much more difficult for skunks and raccoons to dig and turn-over turf with a healthy root system. You donât have to wait until your lawn becomes infested with grubs before you apply a grub killer, you can always use aâ¦ In the last 10 years, the amount of European chafer damage to home lawns in â¦ An online search indicates there are other products that will be available at other stores. vs. You can do this by putting a pinch of nematodes in a glass of water at room temperature for 10 minutes and check to see if they are wiggling. 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