Recently, their populations have begun to expand into surrounding agricultural areas. Japanese beetles overwinter as grubs in soil in grassy areas. Until that time, this insect was restricted to Japan where it is not a major pest. It is now found throughout the eastern U.S., except for Florida, and continues to move westward. The sap from four o’clocks is a mild irritant, causing itching on the skin. Remember that insecticides can pose significant risks to beneficial insects, including pollinators, as well as birds, fish and mammals. Trunk injections should be done by a certified tree care professional. Japanese beetle adults are half-inch-long, shiny, metallic green, oval insects. ST. PAUL, Minn. (WCCO) — Call it summer’s version of beauty and the beetle – make that Japanese beetles! Follow recommended lawn care practices to promote a healthy lawn. This pest is considered to be an invasive species. Plants usually not damaged by Japanese beetles include boxwood, clematis, chrysanthemum, conifers (e.g. Don't use Japanese beetle traps. 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 beetle (Popillia japonica) Family Scarabaeidae The Japanese beetle (JB) is a serious pest of turf and ornamental plants. To minimize the hazard of curative grub insecticides to pollinators, mow any flowering weeds just before or right after the pesticide application. The Minnesota Department of Agriculture monitors this invasive species. Destructive pest of turf, landscape plants, and crops; adults feed on the foliage and fruits of several hundred species of trees, shrubs, vines, and crops, while larvae feed on the roots of grasses and other plants (APHIS 2015) CAUTION: Mention of a pesticide or use of a pesticide label is for educational purposes only. Japanese beetles are only active for six to eight weeks, so leaf feeding typically ends around early August. In parts of southeastern Minnesota Japanese beetle has been actively feeding on soybean. Leaves are typically skeletonized or left with only a tough network of veins. Parasitic nematodes, such as Heterorhabditis bacteriophora, are available. Japanese Beetle IPM (Michigan State University) Grape IPM Guide for Minnesota Producers (Dept. To access the information, click on the map below. Scientific name: Popillia japonica Newman. False Japanese beetle. Several effective, longer lasting insecticides are available for treating Japanese beetles. Adult Japanese beetle damage usually affects only the appearance of plants. The most likely thing to be mistaken for Japanese beetle is the false Japanese beetle which is similar but can be distinguished by coloration and the lack of white hair tufts at the posterior end of the abdomen. And they may attract more insects to your yard. Japanese beetle (Popillia japonica) is an invasive species first detected in Minnesota in 1968. Flowers. There are many ways to deal with them. Given all of this it seems natural enemies have a hard time suppressing Japanese beetle adults. Please report Japanese beetles found outside the seven county Twin Cities metropolitan and southeast areas of Minnesota to Arrest the Pest. 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 More Information. Either avoid applying these insecticides to bee attractive plants or wait until the plants have finished blooming before treating them. 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. Dry soil conditions can reduce egg survival, resulting in fewer adult beetles the following year. Authors: Jeff Hahn, Extension entomologist, Julie Weisenhorn, Extension horticulturist, and Shane Bugeja, Extension educator. 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. When choosing new plants for your landscape, consider using a less preferred plant. 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. Products containing Btg (grubGONE!®, grubHALT!®) have provided inconsistent (i.e., variable) levels of grub control in recent university trials. Young or unhealthy plants may be stunted, injured or even killed from severe, persistent feeding. Damaged leaves attract more beetles so minimizing beetles on plants should mean fewer beetles will be attracted to them. Japanese beetles feeding on leaves, causing skeletonization. This can be useful to avoid pesticide drift, especially when treating large trees. Yellowing or browning grass in August is an early symptom of white grub damage. 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. Japanese beetle is present in most of the eastern United States and has been present in Minnesota for decades. BeetleGone, BeetleJus), derived from soil bacteria, is moderately effective against Japanese beetle adults, giving one to two week’s protection. If using nematodes, apply them during cool, overcast days or in the evening and water before and after application as they are susceptible to drying out. The fly Istocheta aldrichi lays eggs on adult Japanese beetles in summer, whereas the wasp Tiphia vernalis parasitizes grubs in the spring. Adult Japanese beetles become active in Minnesota in … For a free quote on Japanese beetle control in Minnesota, get in touch with one of our pest control experts. Photo by Pennsylvania Department of Conservation and Natural Resources, Forestry Archive, bugwood.org. Rose chafers can also be mistaken for Japanese beetle but lack the white patches of hair along the abdomen entirely. It is well established from Maine to Minnesota south to Arkansas and Georgia. Adult Japanese beetles feed on the leaves, flowers and fruits of many different plants. 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