7. Serving the Greater Charlotte area since 1993. This often leads to brown spots of dead or dying grass in lawns—a tell-tale sign of a Japanese beetle larvae infestation. Grubs overwinter in the soil about two to six inches below the surface, although some may be a deep as 20 inches. Get rid of the “grubs” Grubs are Japanese beetle larvae. Did you know Japanese beetles are drawn to more than 300 plant species? Just treating your property with this material won’t insure you against beetles flying from the surrounding miles. The feeding habits of Japanese beetles are what make them such a nuisance. Once they get inside, they’re stuck. The grubs grow quickly, and by late-August are nearly full-grown (about one inch long). Connect with your County Extension Office », Find an Extension employee in our staff directory », Get the latest news and updates on Extension's work around the state, Feedback, questions or accessibility issues: info@extension.wisc.edu | © 2020 The Board of Regents of the University of Wisconsin System Privacy Policy | Non-Discrimination Policy | Discrimination and Harassment Complaints | Disability Accommodation Requests | Civil Rights. If you are interested in Japanese Beetle control or help with other types of beetles feeding on your trees and shrubs, we would be happy to talk to you. The problem with Japanese beetle traps is that you might be attracting more beetles than the trap can hold. They As larvae, Japanese beetles live underground, feeding on the roots of grasses and other garden plants. 5 Tips And Tricks For Dealing With Japanese Beetles. This can be more effective than insecticides when outbreaks are heavy. Japanese beetles occur in every state east of the Mississippi River except Florida. Plants Attacked and Damage:  Japanese beetle adults do not damage turf, but are an important pest of many other plants. They are opportunistic feeders and have been documented to feed on over 300 types of plants and crops. Immediately thereafter, females mate with males and begin laying eggs. Treating the soil for JB grubs does control this immature life stage but does not create a force field of protection to keep Japanese beetle adults from flying in from other areas. Linden trees can be a magnet for Japanese beetles. While these beetles are not likely to ruin your plants’ health, they can definitely, There are plenty of products you can apply to your lawn or garden this spring to help fight off Japanese beetles. Males and females have the same markings, but females are typically slightly larger. Yes, recent research indicates that handpicking JB at 7:00 p.m. results in lower populations overall. Not so much. , so we’ve gathered some tips and tricks for keeping these pesky beetles at bay! The presence of too many insects and beetles at night can also cause a health risk according to a study published by Environmental Health … Easy, right? They become inactive when soil temperatures fall below 50F. Shortly after, they will return to feeding and mating and start the cycle all over again. A+ BBB Rating. The optimal timing for curative treatments is early to mid-August. Even though summer may seem far away, there are plenty of ways to prepare your yard now for Japanese beetles. Japanese beetles have a fairly impressive list of predators, and researchers are working hard to use predators as a method of control instead of insecticides. Preventative Treatments:  Certain trees and shrubs can be treated in the spring to reduce beetle damage in the summer. If your plants are located in the sun, they will probably be more likely to be hit by beetles as a general rule. Well, they are. When the beetles realize they can’t get into the trap, they’re bound to go exploring. However, knowing the right time isn’t always easy. Preventative insecticides are another effective management option that is typically preferred over curative insecticides due to greater level of control and a larger application window of time, May to July, due to their longer residual activity. Ah, summer. What do Japanese Beetles Like to Eat? Feeding by Adults Although adult Japanese beetles feed on more than 300 plant varieties, the beetles exhibit a definite preference for some varieties. This could lead to more beetles getting in your yard or garden and destroying your plants—all while never getting caught. However, there are some methods that can drastically reduce the damage you may find. Japanese beetles are about half an inch long with dark heads and metallic green and brown wing covers. Home // Blog // 6 Japanese Beetle Facts You May Not Know. remain there at nightfall and most of the day as well. Their feeding damage is usually easy to distinguish from other leaf feeding insects because they do not eat the veins, leaving lacy-looking leaves. Using beetle traps is like putting a neon sign in your lawn for beetles to come chow down. With over 300 ornamental and edible plants they like to feed on, Japanese beetles (JB) can quickly become an overwhelming insect in the landscape. While insecticides can be effective, studies show that. The Japanese beetle has a metallic green body with copper-brown wing covers. The use of milky spore fungus does show promise for large area Japanese beetle control, but research on this method is ongoing. The best part is, if the Japanese beetles injest the neem oil, they will pass it down to the eggs, preventing them from hatching. A Better Business Bureau Accredited Business. Preventing grubs in your lawn is a great lawn care tactic to keep your turf from being damaged in late summer or early fall. a Japanese beetle? Adult Japanese beetle damage. A few other birds that consume grubs and sometimes adults include: Another interesting predator of the Japanese beetle is the Tachinid fly. 5)  Milky Spore isn’t a great method to control beetles. Japanese beetles love the summer months—maybe even more than you do! Even though these pests are well-known, there are still a lot of information you may or may not know about Japanese Beetles and other beetles that may be feeding on your landscaping. While insecticides can be effective, studies show that neem oil, or “antifeedant”, can be used to help deter them from feeding. Life Cycle:  Japanese beetles have only one generation per year. A lot of times, beetles lay eggs in landscape beds as well as lawns (particularly if the ground is dry and hard), and grubs will turn into beetles later to feed on the plants above. This approach is termed “curative” control. Despite how it sounds, handpicking JB is a viable alternative for plants that are readily reached. Did you know that Japanese Beetles are most active in the morning? When the temperature reaches 80 degrees and higher, you’re bound to start seeing Japanese beetles around your home. We’re not the only ones who enjoy the hot, sunny days of summer. Once feeding begins, the hindguts of larvae appears gray to black. The beetle is adapted to a region where the mean summer soil temperature is between 64 and 82F and winter soil temperatures are above 15F.