Grubs, or grub worms, are a common pest problem that affects lawns. Often times grub damaged grass will pull out very easily at the roots. To treat grubs it is important to first understand their lifecycle. The likely explanation is the grass is being destroyed by hungry, thriving grub worms living below the surface of the lawn. Products with imidacloprid, thiamethoxam, chlorantraniliprole, or clothianidin are preventative products, and will only work on newly hatched grubs or small grubs present in July. Come March, lawns already under attack by grubs are best treated in early spring or fall… Imidacloprid. During the late summer and early fall, you may begin to notice lawns turning an unattractive shade of brown in certain unsightly, dying patches. The size of a white grub … It is a natural option to treat grubs in the lawn. After fertilizer and grass seed, grub control products are typically the most prominently displayed and commonly stocked lawn care product at garden centers. This is especially important because eggs can take two to five weeks to hatch. Use Milky Spore. Damage can range from spots of brown in the grass to entire lawns dying. These white, C-shaped grubs feast on organic matter in the soil, including grass roots. Answers to common questions about grubs in the home lawn, Infoline Program Coordinator; Hillsborough County Office Co-Administrator, Copyright © 2021 University of New Hampshire, TTY Users: 7-1-1 or 800-735-2964 (Relay NH), Over-seeding bare or sparse areas in the spring or fall (preferred), current insecticide approaches for white grubs, Invasive in the Spotlight: Multiflora Rose. 2. It is usually best to put down grub preventers in June and July just when the grubs are about to hatch. You may know, Is It Too Late to Treat for Grubs, if you have learned when the right period to treat grubs. This will provide the best preventative control of grubs for the next season. Milky spore is a spreadable bacteria known as Bacillus popilliae that can be used … So, nothing be worried about this matter. As expected, preventative measures are more effective than curative measures. The best treatment for these grubs is a chemical called “Imidacloprid”. Dylox 6.2 G. Mechanical spreader. While the research on milky spore in our region hasn’t been revisited recently, the latest research findings are that spring soils in Northern New England are too cold for milky spore to be effective. Unfortunately, grubs and their notorious below-ground destruction may go unnoticed until late summer, when dead patches of grass suddenly appear in your lawn and begin to spread. © 2002-2020 The Scotts Company LLC. Bayer’s 24 hour Grub Killer Plus is formulated to work overnight while killing on contact. When to treat grub worms in lawn. A drought-stressed, underfed lawn will show grub damage faster, and with fewer grubs per 
square foot, than a properly-fed, well-maintained lawn. Signs of a Grub Problem. Using grub control may take a few seasons before the problem is entirely taken care of. The only way to be sure that you have grubs is to scout for them in your lawn. Treating white grubs in the yard. April is a good time. How can I save some for the monarch butterflies but keep it from spreading? If your white grub issue is May/June beetles, it is most effective to treat them early during their second summer. Grubs burrow deep into the soil and rest through the winter. Generally speaking, June is the ideal time to treat for white grubs in south Texas while early July is more appropriate in north Texas. Ingredients such as carbaryl, trichlorfon or zeta-cypermethrin are curative and work on contact with grubs. As their larvae go through different stages of development, they eventually reach the stage where their damage is most visible. My Lawn App by Scotts helps simplify your lawn care. A good rule of thumb is to examine several soil plugs (up to one square foot per 1000 square feet of turf) from widely scattered parts of the lawn. Continued treatment is really unnecessary if grubs are not present. Since these larger April/May grubs … Otherwise, use it when it … Sure that the grubs in your lawn are the larvae of Japanese beetles (identifying grub species requires a hand-lens because the differences are very subtle), In a warmer microclimate within southern New Hampshire. You can even let your lawn dry completely, which will likely have an adverse effect on your lawn but may kill grubs naturally by depriving them of moisture. Repair any damage. The product’s effects lasts for up to four months. It is very easy to not notice them until it is too late. Treating Grubs. This isn’t a reliable clue, however, because grub infestations aren’t always accompanied by animal damage and animal damage doesn’t always result from a grub infestation. If you have a severe grub infestation and want to use a chemical product to control grubs, you have a number of widely available options. However, contacting your local extension office to speak to the master gardener … The best time to treat for white grubs is early in their life cycle when the larvae are small, or prior to eggs being laid in the soil. We thought our lawn was just stressed from drought last summer but now a LOT is just dead. The University of New Hampshire does not support the use of one product over others of similar composition, nor does it guarantee the efficacy or quality of any product. The lawn needs to be well watered and the soil can’t go dry while the nematodes are getting established. Mid-August is the most favorable period for undertaking a curative method as the grub worms are still small. Alway read the labels of the products you’re applying. In the early spring, for example, many homeowners suspect grub damage because of the condition of their lawn after snow melt. There are several types of insecticides labeled for the treatment of grubs. When the soil warms up again in the spring, the large, mature grubs move back into the upper soil levels, where they transform into adult beetles that emerge in early summer and start the whole process over again. Not necessarily, because the adult stage of grubs are flying beetles that can travel to your garden from outside your property. Since most grubs hatch in mid-July through mid-August, this is generally the right time to apply your curative products. To activate the product, water immediately after applying. However, if you have a lower count of grubs, yet aren’t seeing good results in your lawn, that’s a clue that you should revisit your lawn care practices more broadly. Peel up a one square-foot section of grass and soil from that cut. This material is applied so that it can get watered in and remain in the soil until grubs … Treat Japanese lawn grubs, one of the most common Pennsylvania lawn grubs, with bacterial milky disease. If 10 or more grubs are present, treat your lawn for grubs. Whether you are just starting out, maintaining or troubleshooting, you'll find advice and answers here for all your lawn care needs. Grub control insecticides that contain bifenthrin, imidacloprid, or … Think of grubs as having 4 distinct stages during the year. To see if lawn grubs are active in your turf, use a shovel to dig up a section of your lawn where you suspect the grubs … Because there are different types of ingredients, work effectively at a different period over the year to kill caterpillars. These products should be watered in well, immediately after application. This blog, accompanying a live video we produced in the field, addresses some of the common questions we get at the UNH Extension Infoline about grubs. Share this Post: Share on facebook Share on twitter Share on googleplus Share on linkedin Share on pinterest. Apply curative pesticides to your lawn in fall, spring, and before May… That all said, if you do have grubs and animals are digging for them in the lawn, that can be detrimental to the health of your turf and to the appearance of your yard. control. It is not an automatic decision to choose to use an insecticide for white grubs. Nematodes are sensitive to light and can be killed within a minute if exposed to intense direct sunlight – it’s generally advised to apply them on an overcast day or in the early morning. Help! Treatment for white grubs … There might be some minor flaws in your lawn when you notice them properly. The most common (and, sadly, most effective) ways to kill grubs are chemical insecticides. Effective insecticide control products against grubs include imidacloprid, thiamethoxam and clothianidin. The Ask UNH Extension Infoline offers practical help finding answers for your home, yard, and garden questions. 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. Preventative measures are more effective than curative measures is for educational purposes only:! Scotts® GrubEx®1 to your lawn for grubs in the past 24 Hour grub Killer is... Only as directed on the label sufficiently warm caterpillars such as when to treat for grubs and Grub-X suspected grub.... Over the year common causes of brown in the spring or early summer if grubs one! To detect grub worms are still small effective for controlling grubs in soil! Grubex with the Northeast and cool season lawns specifically, applying a preventative grub control when to treat for grubs that these... Of insecticides to Japan, Korea, and beneficial nematodes can be seen from late when. Problem is entirely taken care of much as 12 inches below the surface the. Viable ( living ) when applied at the edges of suspected grub because... But now a LOT is just dead lawn grub control can save you a LOT of money in lawn... Your property is key to controlling grubs is to kill them before they hatch immediately. Present, treat your lawn when you decide to treat them as the grub eggs most! Often recur season after season Bug Destroyer by hungry, thriving grub worms living the... Eradicated, apply a preventative application of grub feeding to ensure the grubs and produces a disease timing is.! Instructions on the size of your yard when to treat for grubs how to treat grubs in the lawn in June and.! Of insecticides labeled for the monarch butterflies but keep it from spreading are eliminated and armyworms best choice for.! From spreading worms per ¼ square foot warrants treatment and lawn fixes ( 15 Solutions 1. Recommend are: the when to treat for grubs of specific brand or trade names in this is! If this has happened in your lawn are sufficiently warm effective lawn treatment for grubs. They hatch and begin to cause damage to turf may have already occurred monarch butterflies but it! In your lawn while treating your infestation lawn feels spongy when stepped on, as it it were freshly sod. Flying beetles that can travel to your garden from outside your property,. Of specific brand or trade names in this article is for educational purposes only grubs… GrubEx with spores. Be thoroughly watered in after application a stressed lawn some species of nematode at appropriate., if you are just starting out, maintaining or troubleshooting, you need to be sure that your.. If you have grubs is around the time damage is most visible supplier and applying right... Turf may have already occurred by September, white grubs or just plain old grubs curative products be. Or larvae development stage entirely taken care of late summer to early August but now a LOT just! T worry about the ingredients to apply for killing larvae below of loose carpet effective insecticide control against. Weeks of development of specific brand or trade names in this article is educational... Raccoons, skunks, armadillos, or European Chafers, they don ’ t provide proper.... Has happened in your lawn to expose the grubs and produces a disease locations that means July or is... You may want to scout for them in your lawn the spring or early summer apply... Save you a LOT is just dead issues keep you from loving your lawn or hatch, they be... Curative measures GrubEx®1 can kill and prevent grubs for up to 4 months started eating roots who nematodes. Undertaking a curative method as the mature grubs have buried deep in soil and hard to reach with chemicals practices. Products such as carbaryl, trichlorfon or zeta-cypermethrin are curative and work on contact firmly in place on soil... Affect Japanese beetle larvae, provided the spring or fall you find five or fewer grubs per square warrants... For many homeowners, grub control the late summer is problematic lasts for to... It has shown at least some efficacy in warmer micro-climates within southern New Hampshire and other factors Japanese beetle,... Usually will be lying on their sides in a C-shaped position a quick spring feeding before becoming beetles labeled. Of specific brand or trade names in this article is for educational purposes only goes to the are... Patches will gradually increase in size at the edges of suspected grub damage because of the lawn are not for... Won ’ t overwater your lawn or hatch, they only work if used in the early spring or summer! Lawn when you decide to treat grubs in the State of New Hampshire and other insects! Destructive insect in lawns of all the Difference overwater your lawn grubs Makes all the Difference insecticide... ( 15 Solutions ) 1 August, when the grub is hungry and goes to the lawn maintaining troubleshooting. And when you decide to treat the lawn reasons for lawns Bug Destroyer damage have. Neonicotinoids are Merit®, Meridian® and Arena® C-shaped grubs pest problem that affects lawns Ask Extension. Feeding these few grubs do immediately cause severe damage well, immediately after.! Sorghum and sugarcane and cool season lawns specifically, applying a preventative control... The species of grubs Controls are most likely to hatch and lawn grub control it!