This will minimize the spray impact on any foraging bee activity during application periods. However, it is the soil-residing grub stage of beetles that we regularly find in and around the landscape (June beetles, masked chafers, etc.) (To find a certified arborist, visit. Acelepryn (Chlorantraniliprole) is a reduced risk insecticide product and is effective in controlling adult beetles on ornamental plants as a foliar application. When to apply the treatment: Here is an infographic showing the life cycle of the Japanese beetle. In fact, 2017 was the year when the highest populations were recorded thus far. The female beetles prefer to lay eggs in the soil of lawns and other turfgrass areas. How to Prevent Japanese Beetles. Japanese beetle activity in some parts of Kentucky this year have resembled scenes from the 1980s when this insect rolled across the state (Figure 1). To minimize the stress of defoliation on sensitive tree species, boost plant health during the growing season with water, nutrients and other proper tree care practices. A biological treatment method, useful against only Japanese beetle grubs, is the application of milky spore bacteria. After you remove the pest from the plant, drop it into a bucket of soapy water. Preventive treatments are the most effective and are applied in late June and early July as eggs are first being laid. The spores germinate inside the grubs, eventually killing them. Grubs are found lying on their sides in the form of a "c" when exposed. To fight Japanese beetles at the grub stage as well as adults, Sevin ® Insect Killer Granules works above and below the surface to kill beetle larvae along with more than 100 other insect pests. The grubs of economic importance in North Carolina are those of the Japanese beetle, the green June beetle, the southern masked chafer, the northern masked chafer, and the Asiatic garden beetle. Japanese beetle grubs tend to be most common in new developments with bluegrass sod. They also have small white hairs lining each side of the abdomen. Typically, Japanese beetles begin to emerge in late June and early July in WI, with peak activity for six to eight weeks. Signs of Grub Problems. Controlling Japanese beetle grubs is a smart way to protect your lawn. (Bumblebees do not make grubs! Bacillus thuringiensis galleriae (Btg) is a bio-insecticide which can help protect foliage from adult Japanese beetles. You can kill all the grubs you want to – they are not larvae of any beneficial insect!) Other option is to use the reduced risk insecticide product Acelepryn followed by light irrigation as preventive grub treatment application in turf. Japanese beetle larvae are a type of white grub that feeds on the roots of grasses. Milky spore is a common grub treatment, but it will only affect Japanese beetle white grubs. Grubs are easiest to control when they are young, so take preventative action in late spring through early summer. All of these beetles go through four distinct forms during their life cycle: egg, grub (larva), pupa, and adult. Whatever the reason, if your lawn is showing signs of being under attack from grubs in early fall then a curative treatment will help manage your grub problems. A curative treatment is easy to spot. Several other white grub species including Asiatic garden beetle, European chafer, green June beetle, May and June beetles, and Oriental beetle are occasionally observed in home lawns and may cause significant damage. Once the egg hatches, the grubs will go through three larval stages or instars during their development. This estimate is important for deciding the severity of your white-grub problem and whether treatment is necessary. Japanese Beetles were accidentally introduced to the east coast in 1916 in a shipment of iris bulbs. Life Cycle. Pick Japanese beetle adults from your plants. Since then they have slowly and steadily made their way westward. How to Treat Japanese Beetles & Grubs: Stage 1 Dormant Grub: October – March. Come March, lawns already under attack by grubs are best treated in early spring or fall. The powder only has to be applied one time using a specially designed applicator. As they get larger, it is more difficult to kill them and by fall it is no longer practical to manage them. When fighting this serious pest, it’s important acknowledging that both an adult and immature form are dangerous. How to Get Rid of The Japanese Beetle and White Grubs? that might be contributing to problems very soon. Japanese beetle grub populations on their golf courses. Roses, birches, lindens, grapes, raspberries, Norway … of your white-grub problem and whether treatment is necessary. Photo Credit: Jeff Hahn, University of Minnesota. It is best starting in August to bring back out the Bayer Advanced 24 Hour Grub Killer Plus. Established in Wisconsin in the 1990s, the Japanese beetle (Popillia japonica) is a voracious defoliator of many landscape and garden plants. Timing will vary by geographic location. Curative treatments applied in late summer or early fall are more effective than spring applications because the grubs are smaller and easier to control. Japanese beetles have a one-year (annual) life cycle. Turf should not be irrigated during the beetle's active season to help prevent the insect from laying eggs there. Japanese beetles and northern masked chafer grubs are the predominant damaging white grub species associated with home lawns. Granular residuals containing insecticides distributed on soil with a spreader are usually the best applications for Japanese beetles. Since then, the Japanese Beetle has been a severe and devastating pest across the US and later Canada. These treatment thresholds can vary depending on the kind of white grub present. A preventive grub insecticide (with an active ingredient containing imidacloprid, halofenzide, clothianidin or thiamethoxam) can be scheduled for application to lawns before the end of July to prevent eggs from hatching. It can be found in the product beetleGONE!, which is approved for organic production. Remember that not every garden with a Japanese beetle problem has a lawn full of grubs. Japanese beetle grubs can be sampled in late summer (August to October) and late spring (April to June). These beetles feed on surrounding plants and lay eggs in the soil throughout the summer. Japanese beetle grubs have a V-shaped raster pattern, while northern masked chafer grubs have a nondescript “random” raster pattern (Fig. After this spring feeding period during the third summer of its life cycle, the grub pupates and turns into an adult Japanese beetle. The best way to control adult beetles is to make a preemptive strike, in the spring, well in advance of the adults emerging. Of most concern is the Japanese beetle, a voracious feeder on the foliage of many ornamental and garden plants that often warrants treatment as an adult. May 16, 2017 - Author: David Smitley. Milky spore is a common grub treatment, but it will only affect Japanese beetle white grubs. How to Control Adults. Adult Japanese Beetles are only around 40 days or so but they can do a lot of damage during that time so treat as soon as any signs are evident. Traps are … That’s why it’s so important to let BEST’s professionals take care of Japanese beetle treatment for you. So to know if you are treating just the Japanese Beetle larvae, you have to really know the life cycle. Grubs will usually stop feeding and start to die within 24 hours. Small grubs are easily killed at this time of year by applying products containing trichlorfon. Following are some best management options to control Japanese beetle adults and grub that can minimize impacts on pollinators: ... Mow any flowering weeds before scheduling liquid applications of preventive or curative grub treatment products in turf areas. Because of this, various size grubs are commonly found in the soil. Be sure to read the insecticide product label for its instruction, post-harvest interval period and safety precautions. The best products to prevent and control grubs in your lawn contain the active ingredients Imidacloprid ( Merit, Jonathan Green ), Chlorantraniliprole ( GrubEx) or Thiamethoxam ( Meridian ). Japanese Beetles were accidentally introduced to the east coast in 1916 in a shipment of iris bulbs. This is why it is important to identify the grub before deciding to treat. Mowing of flowering weeds is not needed if using granular or pelleted grub treatment products in the turf followed by light irrigation to move the product into the thatch layer. Small shrubs like roses, and young Japanese maples can be protected using nylon insect screens (mesh size