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. We thought our lawn was just stressed from drought last summer but now a LOT is just dead. The products that are designed to be used for grubs in the lawn are not designed for use in gardens. How To Treat for Grubs [Prevent Before its Too Late] Posted by Dave Schwarm on Jun 25, 2020 4:02:18 PM Tweet; The Importance of Preventative Grub Control Grubs are the silent killers of lawn pests. If you treat for grubs in the spring, you must realize that another treatment may be necessary in the fall. Come March, lawns already under attack by grubs are best treated in early spring or fall… Often times grub damaged grass will pull out very easily at the roots. These products can be effective, but are broad-spectrum and have a low residual, killing beneficial insects on contact as well as lawn pests like grubs. The lawn needs to be well watered and the soil can’t go dry while the nematodes are getting established. If nematodes are being used curatively, they may need to be applied every 2 weeks until the infestation subsides. They will continue to eat and grow until mid-fall, when they move deeper in the soil so they can survive through the winter. Insecticides are most effective when applied at the second or third instar or larvae development stage. 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. Severe damage to turf may have already occurred by September. The best treatment may kill only 60% of the grubs… 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. Spring Stage-In spring the grub is hungry and goes to the root zone of … GrubEx with the active ingredient chlorantraniliprole is used for preventive soil treatment. Take care to include areas at the edges of suspected grub damage. The two types of curative pesticides you can use are carbaryl and trichlorfon (sold under the brand name Dylox). Treating Grubs. 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. This product is readily available at many garden centers and can be sprinkled onto and watered into the soil according to the manufacturer's instructions. It is not an automatic decision to choose to use an insecticide for white grubs. There are several easy-to-spot signs that you may have grubs in your lawn: To check if you have a grub problem, peel back a square foot of green turf in each of several areas of your lawn. When and How to Apply Grub Worm Treatment. Apply curative pesticides to your lawn in fall, spring, and before May… Ingredients such as carbaryl, trichlorfon or zeta-cypermethrin are curative and work on contact with grubs. Grubs Spotted in the Yard: A sure sign your yard needs a grub treatment is if you actually see grubs in the lawn, but that’s not always easy to see since white grubs rarely appear on the surface of your grass. Timely treatment is crucial as otherwise even the most effective product won’t provide proper effect. From about late April into early June, you can effectively use a product with the active ingredient chlorantraniliprole to control all species of white grubs we have in New Hampshire. Applying a preventative grub control product in the spring or early summer will provide much better grub control than waiting until after the damage has occurred. The U.S. EPA designates this chemical as a low risk pesticide due to its low toxicity to bees and other beneficial insects. The most common (and, sadly, most effective) ways to kill grubs are chemical insecticides. To treat grubs it is important to first understand their lifecycle. Dylox 6.2 G. Mechanical spreader. When Should Grub Control Be Put Down?. Sticking with the Northeast and cool season lawns specifically, applying a preventative application of grub control is imperative and timing is everything. It is recommended for use in the spring or early summer … Some products registered for controlling grubs just have a pyrethroid, such as products with the active ingredient Gamma-Cyhalothrin, commonly found in the Spectracide® Triazicide® Insect Killer For Lawns. treat for grubs, examine several soil sections at least 3 to 4 inches across and 4 inches deep (sample sandy soils to greater depths). This product is the latest innovation in the control of grubs in your lawn. You can pull back the dead patches on your lawn like pieces of loose carpet. Examples of products that contain these chemicals include Sevin® and Dylox®. Grubs also attract other pests that feed on grubs. control. If you’ve had problems in early summer with beetles, and by late summer dead patches of grass have appeared in your lawn, you probably have grubs. Typically, more than five grub worms per ¼ square foot warrants treatment and lawn grub control. This is why it is important to identify the grub before deciding to treat. The key to controlling grubs is to kill them before they hatch and begin to cause damage to your lawn. Grub preventatives are meant to kill the grub larvae that is recently hatched during the late summer. As someone said, “It’s the kids that are always the problem.” If grubs are found in the fall, we recommend treatment in the fall to minimize damage. These animals feed on other insects in the lawn, like earthworms, which are beneficial to the health of the lawn. Many lawn issues that resemble grub damage can be caused by something else, including disease, drought stress, hairy chinch bugs, sod webworms, shade, compaction, and more. Help! Grub Treatment Options. Purchasing nematodes from a reputable supplier and applying them right away are important. To determine the extent of infestation or which areas require treatment, dig up small sections of lawn. Generally speaking, June is the ideal time to treat for white grubs in south Texas while early July is more appropriate in north Texas. Treatment for white grubs in late summer is problematic. World rights reserved. Product availability is subject to change depending on registration status in the State of New Hampshire and other factors. Treating white grubs in the yard. Mid-August is the most favorable period for undertaking a curative method as the grub worms are still small. A good rule of thumb is to examine several soil plugs (up to one square foot per 1000 square feet of turf) from wide-ly scattered parts of the lawn. The size of a white grub … The only way to be sure that you have grubs is to scout for them in your lawn. Learn more about these beetles. Grubs thrive in moist conditions, so don’t overwater your lawn while treating your infestation. By the time damage is apparent it is much too late for preventive white grub products such as Merit and Grub-X. How can I save some for the monarch butterflies but keep it from spreading? To successfully use nematodes for grub control, you should keep the following principles in mind: For home gardeners that do their homework and follow instructions carefully, nematodes can be a great natural option for controlling grubs. During the late summer and early fall, you may begin to notice lawns turning an unattractive shade of brown in certain unsightly, dying patches. When to Control Grubs Controls are most effective on immature grubs. However, contacting your local extension office to speak to the master gardener … According to research from Michigan State University, products that only contain lambda-cyhalothrin, gamma-cyhalothrin, bifenthrin, deltamethrin, cyfluthrin or permethrin do not work for grub control. The product’s effects lasts for up to four months. My Lawn App by Scotts helps simplify your lawn care. Not necessarily, because the adult stage of grubs are flying beetles that can travel to your garden from outside your property. Milkweed is taking over my perennial garden. One of the most common and potentially destructive insect in lawns of all types is white grub. Bayer’s 24 hour Grub Killer Plus is formulated to work overnight while killing on contact. Grubs feed on the roots of grasses, so lawns will show wilting and browning of irregular shaped areas. Grubs burrow deep into the soil and rest through the winter. Most of the grub control products available work best as a preventative, keeping the newly hatched grub … Before applying any insecticides, the lawn should be mowed prior to application so there aren’t weeds flowering in the lawn while the product is being applied. 2. Treat Japanese lawn grubs, one of the most common Pennsylvania lawn grubs, with bacterial milky disease. Grub Treatment – Grubs, Moles and Lawn fixes (15 Solutions) 1. To confirm whether you need to treat for grubs, examine several soil sections at least 3 to 4 inches across and 4 inches deep (sample sandy soils to greater depths). Before we talk about the best preventative insecticides it’s important to point out the importance of timing. larvae of the European Chafer beetle. Repair any damage. You should treat for grubs in late spring through early summer. Native to Japan, Korea, and eastern China, multiflora rose (... *Pictured above: improperly applied mulch. Common milkweed (Asclepias syriaca) is a perennial plant... University of New Hampshire Cooperative Extension Some species of nematodes only control certain species of grubs, so just like with milky spore, identifying what species of grubs you have is important. You can … How to Treat Japanese Beetles & Grubs: Stage 1 Dormant Grub: October – March. Milky spore is a spreadable bacteria known as Bacillus popilliae that can be used … As expected, preventative measures are more effective than curative measures. Treatment for white grubs … Think of grubs as having 4 distinct stages during the year. These animals love to eat grubs… 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. To apply this remedy, you have to make sure the soil of your yard has moisture. Timing of the Treatment for Grubs Makes all the Difference. If it’s windy and you spray an area of your lawn, there’s a chance the product could drift onto flowering plants nearby. These products should be watered in well, immediately after application. The Right Time for Grub Treatment Coincides with Periods Having the Most Damage. These products should be applied in the beginning of June. There are also several preventative products that include both a neonicotinoid and a pyrethroid, which provides control not only for grubs but also caterpillars, billbugs, and some other lawn insect pests. How to Treat Grubs in Your Lawn By Anthony Smith Things You'll Need. White grubs … In the early spring, for example, many homeowners suspect grub damage because of the condition of their lawn after snow melt. Later stages can be more difficult to control and significant turf damage may have already occurred. The later in the season these products are applied, the farther down the chemical needs to travel in the soil to contact the grubs. 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. A grub infestation will cause patches of thinning turf, and these patches will gradually increase in size. Some of the best practices we recommend are: The two natural products we are asked about most are milky spore and nematodes. We use a granular treatment that only requires one treatment … Some move as much as 12 inches below the surface. A few grubs aren't a problem, but if you see lots of them when you turn the soil, take action. 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. To kill grubs in the spring or fall… There might be some minor flaws in your lawn when you notice them properly. Healthier grass can tolerate more grub feeding, and all grass can tolerate some grub feeding. This happens 
because grubs eat the roots holding the turf firmly in place on the soil. If there is significant grub damage, the grass should peel up quite easily. It is safe for mammals and most fish so it has a small impact on the local ecosystem but does kill the grubs damaging the grass. This is a very popular option being a natural and healthy pest control oil. Milky spore may be worth a try if you are: Keep in mind that milky spore will take several years to achieve good results. Imidacloprid. White grubs are a common turf and lawn pest, and beneficial nematodes can be a very effective (and safe!) Milky spore is a common grub treatment, but it will only affect Japanese beetle white grubs. This is especially important if you’ve had problems with grubs in the past. Most severe injury to plants is caused by large (third stage or instar) grubs feeding on roots in the fall and spring. 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