Four o’clocks are grown as annuals in Minnesota. When grub feeding is severe, dead patches of grass develop. Since then, Japanese beetle numbers have fluctuated from year to … Always follow the pesticide label directions attached to the pesticide container you are using. Japanese beetles overwinter as grubs in soil in grassy areas. And they may attract more insects to your yard. Since its discovery, the beetle spr… Milky spore bacteria, Paenibacillus popilliae (formerly known as Bacillus popilliae) infect only Japanese beetle grubs and have no effect on beneficial organisms. Japanese beetle is present in most of the eastern United States and has been present in Minnesota for decades. Japanese beetle numbers continue to increase in the weekly trap counts conducted by University of Minnesota researchers in Forest Lake, Hastings, Chanhassen, and Rosemount. Maybe I’m imagining it, but are Japanese beetle numbers down this year? Extension is expanding its online education and resources to adapt to COVID-19 restrictions. In one year the Minnesota Department of Agriculture (MDA) trapped more than one million beetles. If physical removal and barriers are not practical or you wish to supplement non-chemical management, you may choose to use an insecticide to protect valued plants. Authors: Jeff Hahn, Extension entomologist, Julie Weisenhorn, Extension horticulturist, and Shane Bugeja, Extension educator. They destroy fields of soybeans and corn. Beetles of Minnesota Showcase listing of Beetles found in the state of Minnesota. Grubs go through three different growth stages (instars) during the summer becoming progressively larger with each stage. 1927). Access county info by clicking on each county. 711 TTY, © Copyright 2020 Minnesota Department of Agriculture, Farm, Property, Real Estate Listing (MN FarmLink), Agriculture Chemical Response & Reimbursement Account, Agricultural Best Management Practices (AgBMP) Loan, Agricultural Growth, Research & Innovation (AGRI) Program, Sustainable Agriculture Demonstration (AGRI), More Business Development, Loans, Grants Topics, Minnesota Ag Water Quality Certification Program, Certified Testing Laboratories (soil & manure), Fertilizer Tonnage Reporting & Inspection Fees, Pesticide Dealer Licensing & Sales Reporting, Read about advice on managing Japanese beetle from the University of Minnesota, U of M Extension - Japanese Beetle Information, Minnesota Japanese Beetle Distribution Map. There are no restrictions related to the movement of Japanese beetle within Minnesota, but there are restrictions related to the movement of Japanese beetle out of Minnesota. Japanese beetles were first discovered in Minnesota in 1968. The Japanese beetle (Popillia japonica), is a common scarab beetle which is causing issues in local gardens, yards, and more recently, in soybean fields. Many people first became aware of Japanese beetle when they were very abundant in the Twin Cities metro area in 2011. Grubs feed on the roots of turf grass and adults feed on the foliage of more than 300 plant species. Japanese beetle is native to northern Japan (Fleming 1976), where it is considered a minor agricultural pest due to the combination of coevolved natural enemies and unsuitable terrain for larval development (Clausen et al. Japanese beetles cause leaves to appear skeletonized. Don't use Japanese beetle traps. The best timing is during the month or so before the adult beetles first emerge and start laying eggs (mid-June to mid-July in Minnesota). Controlling Japanese beetle grubs is unlikely to reduce the number of adults on landscape plants. Watch closely for symptoms of turf damage. BeetleGone, BeetleJus), derived from soil bacteria, is moderately effective against Japanese beetle adults, giving one to two week’s protection. This pest is considered to be an invasive species. But these sources offer no evidence of its effectiveness. Hanging a trap in a home garden is not an effective way to protect plants. Grubs feed on the roots of grass and adults feed on the foliage of more than 300 plant species. Bacillus thuringiensis galleriae is only available from online sources. Japanese Beetles. Japanese Beetles. Means of spread: Japanese beetles can disperse by flying. Leaves are typically skeletonized or left with only a tough network of veins. These beetles used to be mostly known as a crop pest. 625 Robert Street North argus tortoise beetle (Chelymorpha cassidea) All rights reserved. University of Minnesota Extension discovers science-based solutions, delivers practical education, and engages Minnesotans to build a better future. The Minnesota DNR is asking the public to watch out for the European chafer beetle (left), which is shown here in comparison with the better-known Japanese beetle. Japanese beetle adults are half-inch-long, shiny, metallic green, oval insects. In some cases, it is possible to protect plants with fine netting to prevent beetle damage. Japanese beetle is present in most of the eastern United States and has been present in Minnesota for decades. While the insect has been in Minnesota for about 50 years, its population density has been relatively low statewide, with significant numbers building in just the past 3-5 years. The Japanese beetle is a highly destructive plant pest that can be very difficult and expensive to control. Avoid areas being used by ground-nesting bees. In spring, grubs move up near the soil surface to finish feeding and pupate into adult beetles. To access the information, click on the map below. The Japanese beetle (Popillia japonica) is a species of scarab beetle.The adult measures 15 mm (0.6 in) in length and 10 mm (0.4 in) in width, has iridescent copper-colored elytra and a green thorax and head. Use low risk insecticides when they are effective for protecting your plants. While they are not prevalent all over Minnesota, Japanese beetles are “abundant” in the seven county metro area, as well as in Blue Earth, Freeborn, Steele, Omstead and Winona counties. Preventive insecticides are applied as insurance against grub damage. The traps attract beetles using synthetic female sex pheromone and a blend of chemicals with a strong floral odor. Until that time, this insect was restricted to Japan where it is not a major pest. See How to hire a tree care professional. There are both nonchemical and insecticide options for managing Japanese beetle adults and grubs. Japanese beetle can be a significant landscape pest and difficult to tolerate, particularly when they first become abundant in an area. Pyrethroids, including bifenthrin, cyfluthrin, lambda cyhalothrin, and permethrin, last about two to three weeks. By 2001, they occurred in much higher numbers. Preventive treatment may be warranted if a lawn has a recent history of grub infestation, or if the adult beetle flight is particularly high in a given summer. The fly Istocheta aldrichi lays eggs on adult Japanese beetles in summer, whereas the wasp Tiphia vernalis parasitizes grubs in the spring. To minimize the hazard of curative grub insecticides to pollinators, mow any flowering weeds just before or right after the pesticide application. Adult beetles start to emerge from the ground in late June or early July. Japanese beetles (Popillia japonica) were first found in the United States in 1916, after being accidentally introduced into New Jersey. Grubs chew grass roots and reduce the ability of grass to take up enough water and nutrients to remain healthy. Trees and Shrubs. Physically removing beetles can be a practical and effective management practice for smaller landscapes or a few plants, especially when only small numbers of Japanese beetles are present. Photo by Pennsylvania Department of Conservation and Natural Resources, Forestry Archive, bugwood.org. In most cases, Japanese beetle damage is cosmetic only and will not kill plants. Although Japanese beetles feed on many different kinds of plants, there are some that they seldom damage. What Trees & Shrubs Can Leaf-Eating Beetles Damage? The sap from four o’clocks is a mild irritant, causing itching on the skin. Neem oil helps deter Japanese beetles but is less effective when large numbers are present. Rose chafers. Review of Pesticide Options for Japanese Beetles. Rose chafers can also be mistaken for Japanese beetle but lack the white patches of hair along the abdomen entirely. Only treat white grubs to protect lawns from damage. If you think you have an infestation of Japanese beetles, and you're located in a county that Japanese beetle has not been reported or is not known to be abundant (see map above), please visit our Arrest the Pest page to report your findings to the MDA. Photo by Jeff Hahn, University of Minnesota Extension. Note: Please understand that that insects do not adhere to man-drawn borders on a map as such they may be found beyond the general "reach" as showcased on our website. Professional pesticide applicators have access to chlorantraniliprole (Acelepryn®). Treating in spring is no guarantee that the lawn will not be re-infested again in mid-summer. Start management when they first appear. Adult Japanese beetles become active in Minnesota in late June/early July. Mosquitoes. © Scientific name: Popillia japonica Newman. Remember, the label is the law. The … Other states have regulations to prevent the movement of Japanese beetles through infested nursery stock. Look for beetles in your yard and garden starting in late June and early July. Caution: pyrethroids, carbaryl, and acephate are toxic to bees and other pollinators. The Japanese beetle, Popillia japonicaNewman, is a widespread and destructive pest of turf, landscape, and ornamental plants in the United States. They were developed by researchers to monitor for the presence of Japanese beetles so that management strategies could be implemented. Tree Planting Accessories. In the United States, Japanese beetle was first found in 1916 at a nursery near Riverton, New Jersey and is speculated to have arrived via imported rhizomes of Japanese iris, Iris ensata Thunb. The best time to remove Japanese beetles is in the evening or in the morning when beetles on the plants are still cool and sluggish. But the blossoms are often ruined by the insects. Many different plants are consumed by Japanese beetle adults, some of their favorites include roses, grapes, apple and basswood. Mosquitoes. Japanese beetles were originally from Asia and were first detected in the U.S. in the early 1900's and now occur throughout much of the eastern United States. Japanese beetle grubs are pests of turfgrass. Several effective, longer lasting insecticides are available for treating Japanese beetles. They skeletonize leaves by feeding on tissue between the major veins giving them a lace-like appearance. How to manage Japanese beetles without harming the environment (PDF) - from the Minnesota Landscape Arboretum; U of M Extension article - Dealing with Japanese beetles; U of M Extension Yard and Garden News - June 2018 fruits) as this will prevent pollinators from reaching them. Japanese beetles feed for six to eight weeks so it is important to continue management until their numbers decrease. Japanese beetles are a serious pest of flowers, trees and shrubs, fruits and vegetables, field crops and turf. Avoid spraying bees and beneficial insects as these products are toxic to these non-pests as well. The eggs hatch in about two weeks and the grubs feed mainly on the roots of lawn grasses. Grubs. However, Japanese beetle can also be a pest in soybeans and other agricultural crops as well. Curative means treating white grubs when they are feeding and damage is noticed. This product is low risk to bees and other beneficial insects. This can be useful to avoid pesticide drift, especially when treating large trees. Bacillus thuringiensis galleriae (e.g. Toll Free: 800-967-2474 Although both natural enemies became established here, neither is very abundant and they have little impact on Japanese beetle populations. Once the grubs have stopped feeding and started to move downward in late fall, insecticides are not effective against them. The larvae, commonly known as white grubs, primarily feed on roots of grasses often destroying turf in lawns, parks… 2020 Remember beetle-damaged leaves emit air-borne chemicals that attract more beetles. Japanese Beetle IPM (Michigan State University) Grape IPM Guide for Minnesota Producers (Dept. Professional pesticide applicators can also apply acephate (Lepitech) systemically as a soil drench. Other Insect Control. American weevil (Ceutorhynchus americanus). Japanese beetle grubs spend the winter underground in the soil of lawns, pastures, and other grassy areas. The rest of the season will tell that tale. Native to Japan and first discovered in the U.S. in 1916, the Japanese beetle is now found in almost every state east of the Mississippi River, as well as Minnesota, South Dakota and Montana. Adults feed primarily in July and August, although some may be active into September. Saint Paul, MN 55155-2538, Phone: 651-201-6000 Mow any flowering weeds, like clover and dandelions, just before or right after the pesticide application. They are applied to the soil and only one application is needed per year. Contact the MDA if you spot Japanese beetle in areas not known to be infested, or spot large numbers of Japanese beetles in an area where they are not known to be abundant. Photo by William Fountain, University of Kentucky, bugwood.org. During their two-month lifespan, females lay up to 60 eggs. Healthy flowering plants such as roses can survive Japanese beetle feeding. These diagnostic tools will guide you step-by-step through diagnosing a plant problem or identifying a weed or insect. False Japanese beetle compared to Japanese beetle. However, anytime that it can be done is still useful. Yellowing or browning grass in August is an early symptom of white grub damage. Japanese beetles are an invasive species. While they can be effective, results have been inconsistent. Females will lay eggs several different times during July and August, totaling as many as 60 eggs. Adults feed on more than 300 plant species, whereas the grubs feed mainly on the roots of grasses. Since larvae feed primarily on the roots of grass, Japanese beetle is most prevalent in urban environments. Photo by Whitney Cranshaw, Colorado State University, bugwood.org. Beetle-damaged leaves emit feeding-induced odors that attract other beetles (like sharks to blood). Young or unhealthy plants may be stunted, injured or even killed from severe, persistent feeding. Caution: Imidacloprid and dinotefuran are very toxic to pollinators. Adult Japanese beetles feed on the leaves, flowers and fruits of many different plants. Remember that insecticides can pose significant risks to beneficial insects, including pollinators, as well as birds, fish and mammals. Sides of abdomen have five white patches of hairs, and tip of abdomen has two patches of white hair. Japanese beetle (Popillia japonica) is an invasive species first detected in Minnesota in 1968. arborvitae, spruce, fir, pine), daylily, geranium, ginkgo, Japanese tree lilac, forsythia, common lilac, magnolia, red and silver maple, oak, white poplar, redbud, rhododendron and yew. Damaged leaves attract more beetles so minimizing beetles on plants should mean fewer beetles will be attracted to them. Adults can be moved on plant material, and larvae can be transported in the soil of nursery stock. Trunk injections should be done by a certified tree care professional. These dead patches can be rolled back like a carpet due to the lack of roots. In Minnesota, Japanese beetles (Popillia japonica) are primarily found in the Minneapolis-St. Paul Metropolitan area, and in some areas in southeast Minnesota.Japanese beetles have an exceptionally large host range, feeding on the leaves of over 300 species of plants, including apples, grapes, blueberries, raspberries, roses and plums. Preferred plants include rose, grape, linden, apple, crabapple, cherry, plum and related trees, birch, elm, raspberry, currant, basil, Virginia creeper, hollyhock, marigold, corn silks and soybean. Gardeners in Minnesota have had issues with these little buggers for the past few years. Trees and Shrubs. This plant does affect humans. They generally do not affect beneficial insects. Regular harvesting during July and August can decrease feeding on edible parts of the plant. Homeowner products for preventive grub control usually have the words "season-long" grub control on the packaging. They assume the typical C-shaped position in the soil as other grubs. The University of Minnesota is an equal opportunity educator and employer. Grub-damaged turf pulls up easily from the soil, like a loose carpet. of Horticulture, U of MN) The Minn. Extension IPM Program is a collaboration of University of Minnesota Extension & the College of Food, Agriculture, and Natural Resource Sciences (CFANS). CHASKA, Minn. — Japanese Beetles have been slower to emerge this season. Beetles emerging from non-treated grass areas can fly a considerable distance to preferred adult food plants. Given all of this it seems natural enemies have a hard time suppressing Japanese beetle adults. If grubs are not found, examine still living turf at the edges of damaged areas for their presence. This list includes only beetles that have been recorded in Minnesota, but not all of the beetles found in Minnesota. If turf damage has been sporadic the last few years, it may be worth waiting to see if they are a problem. Larvae feed on the roots of grasses and can be a problem for yards and turf. Read about advice on managing Japanese beetle from the University of Minnesota. Check your plants daily and remove any beetles that you find to minimize feeding damage. Japanese beetles were first found in United States in 1916, after being accidentally introduced into New Jersey. This usually results in more damage to nearby gardens and landscape plants than would have happened if no traps were present. They need to be applied after the eggs have hatched and the grubs are present. Other natural enemies observed attacking Japanese beetle adults include many generalist predators such as spiders, assassin bugs, predatory stink bugs, and birds. 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