Japanese beetle grubs look like other white grubs and can only be positively distinguished by examining the pattern of spines and hairs on the underside of the tip of the abdomen. Healthy flowering plants such as roses can survive Japanese beetle feeding. Mosquitoes. The Japanese beetle is a highly destructive plant pest that can be very difficult and expensive to control. 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. Follow recommended lawn care practices to promote a healthy lawn. Although Japanese beetles feed on many different kinds of plants, there are some that they seldom damage. Mow any flowering weeds, like clover and dandelions, just before or right after the pesticide application. Many people first became aware of Japanese beetle when they were very abundant in the Twin Cities metro area in 2011. Access county info by clicking on each county. There are both nonchemical and insecticide options for managing Japanese beetle adults and grubs. 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) They skeletonize leaves by feeding on tissue between the major veins giving them a lace-like appearance. 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. Rose chafers. The larvae of Japanese beetles are white grubs with three pairs of jointed legs and a yellow-brown head. Grubs go through three different growth stages (instars) during the summer becoming progressively larger with each stage. The University of Minnesota is an equal opportunity educator and employer. These beetles used to be mostly known as a crop pest. In parts of southeastern Minnesota Japanese beetle has been actively feeding on soybean. Start management when they first appear. By 2001, they occurred in much higher numbers. Dry soil conditions can reduce egg survival, resulting in fewer adult beetles the following year. Remember, the label is the law. Clothianidin, in particular, is systemic; i.e., it can be taken up by the roots and move into the nectar and pollen of flowering lawn weeds. 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 Japanese Beetles. They are applied to the soil and only one application is needed per year. This plant does affect humans. Avoid spraying bees and beneficial insects as these products are toxic to these non-pests as well. Since then, Japanese beetle numbers have fluctuated from year to year. This can be useful to avoid pesticide drift, especially when treating large trees. 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). “This year it’s an epidemic, they’ve gone over to corn and soybeans now. The Minnesota Department of Agriculture monitors this invasive species. The rest of the season will tell that tale. After mating, females tunnel underground in the soil one to three inches to lay eggs. American weevil (Ceutorhynchus americanus). Toll Free: 800-967-2474 CAUTION: Mention of a pesticide or use of a pesticide label is for educational purposes only. Japanese beetles are an invasive species. They chew grass roots, causing the turf to brown and die. It is well established from Maine to Minnesota south to Arkansas and Georgia. Although these bacteria occur naturally in the soil and may infect a small percentage of the grub population, applying commercial milky spore products has not been shown to provide any benefit in modern university research trials. 1927). Curative means treating white grubs when they are feeding and damage is noticed. But these sources offer no evidence of its effectiveness. Don't use Japanese beetle traps. Damaged leaves turn brown and may fall off. Use low risk insecticides when they are effective for protecting your plants. Since that time they have spread west and have finally reached Minnesota in the 1980's. Avoid areas being used by ground-nesting bees. Adult Japanese beetles. Photo by Whitney Cranshaw, Colorado State University, bugwood.org. They destroy fields of soybeans and corn. In Minnesota, Japanese beetles are established in the Twin Cities and other urban areas in the southeastern region of the state. Some years are bad, others not so … Minnesota’s first sighting of an invasive European chafer beetle was recently reported by a South Minneapolis resident after noticing large swarms of beetles in the homeowner’s yard. 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. It is now widespread across North America, reported in all of the contiguous 48 states except for Florida. More Information. Japanese beetle infestations in Minnesota are mostly found in the Twin Cities metropolitan area and southeast region of the state. Grubs feed on the roots of grass and adults feed on the foliage of more than 300 plant species. Do not treat in spring because the large grubs are hard to kill, they feed for a relatively brief time and rarely cause damage in the spring. Many people first became aware of Japanese beetle when they were very abundant in the Twin Cities metro area in 2011. This product is long lasting and is a low risk to bees. Given all of this it seems natural enemies have a hard time suppressing Japanese beetle adults. Japanese beetle (Popillia japonica) is an invasive species first detected in Minnesota in 1968. Although they are able to eat many different kinds of plants, for anyone who has experienced Japanese beetle, it is clear that they have some plants they prefer over others. Consider using a professional pesticide applicator, especially for trees. This product is not toxic to bees and other beneficial insects. Here are some other options from the University of Minnesota Extension and the Minnesota DNR., including this homeowners Japanese beetle handbook! Please report Japanese beetles found outside the seven county Twin Cities metropolitan and southeast areas of Minnesota to Arrest the Pest. 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. Regular harvesting during July and August can decrease feeding on edible parts of the plant. 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. Rose chafers can also be mistaken for Japanese beetle but lack the white patches of hair along the abdomen entirely. Pyola®) are somewhat effective contact insecticides provided they are sprayed directly on the insect. Adult Japanese beetles become active in Minnesota in … Professional pesticide applicators can also apply acephate (Lepitech) systemically as a soil drench. Acknowledgement: Special thanks to Dan Potter, University of Kentucky, for his review and comments on this publication. By physically removing them, you’ll reduce the number of new beetles attracted to 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. Japanese beetles are only active for six to eight weeks, so leaf feeding typically ends around early August. False Japanese beetle. The eggs hatch in about two weeks and the grubs feed mainly on the roots of lawn grasses. Gardeners in Minnesota have had issues with these little buggers for the past few years. 625 Robert Street North Other Insect Control. Japanese beetles are not the end of the world. NEW: Conditions related to movement of plant products that could carry Japanese beetle between states are set by the Japanese Beetle Harmonization Plan which has recently been updated, read about the updated plan. Either avoid applying these insecticides to bee attractive plants or wait until the plants have finished blooming before treating them. argus tortoise beetle (Chelymorpha cassidea) Adults feed on more than 300 plant species, whereas the grubs feed mainly on the roots of grasses. Japanese Beetle IPM (Michigan State University) Grape IPM Guide for Minnesota Producers (Dept. Adult Japanese beetle damage usually affects only the appearance of plants. Japanese beetles are a serious pest of flowers, trees and shrubs, fruits and vegetables, field crops and turf. Several effective, longer lasting insecticides are available for treating Japanese beetles. Metallic green head and thorax (the area behind the head) with copper-brown wing covers. Two natural enemies of Japanese beetles have been released in Minnesota. Popular methods include a trapping survey, soil sampling, and treatment of plants prior to shipment. Recently, their populations have begun to expand into surrounding agricultural areas. As the soil starts to cool in the fall, the nearly mature, full-sized (third instar) grubs dig deeper in the soil, where they spend the winter. To minimize the hazard of curative grub insecticides to pollinators, mow any flowering weeds just before or right after the pesticide application. Do not apply to soil within 4-5 feet of pollinator attractive plants. Handpick or knock the beetles into a bucket of soapy water to kill them. JAPANESE BEETLES were first found in the states in the early 1900's in New Jersey. Preventive insecticides are applied as insurance against grub damage. Adult Japanese beetles feed on foliage, flowers, and fruits. Carbaryl or acephate will provide one to two weeks’ protection. Japanese beetles feed on a wide variety of flowers and crops (the adult beetles attack more than 300 different kinds of plants), but in terms of garden plants, they are especially common on roses, as well as beans, grapes, and raspberries. 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. Trees: apple, crab apple, linden, birch, and other fruit trees; Other plants: shrub roses, vegetables, and annual flowers; Organic Japanese Beetle Control Benefits. Scientific name: Popillia japonica Newman. Review of Pesticide Options for Japanese Beetles. Japanese beetles (Popillia japonica) were first found in the United States in 1916, after being accidentally introduced into New Jersey. Healthy, mature trees and shrubs can tolerate a lot of feeding without significant, long-term injury. Products containing imidacloprid or clothianidin are also effective if applied preventively, but they can pose a hazard to bees foraging on flowering weeds or nesting in treated lawns. Hanging a trap in a home garden is not an effective way to protect plants. Professional pesticide applicators have access to chlorantraniliprole (Acelepryn®). Chlorantraniliprole (such as Scott's Grub-Ex®) is an effective, preventative insecticide that is also low risk for bees. Saint Paul, MN 55155-2538, Phone: 651-201-6000 The Polar Vortex weather may have hurt their population. This list includes only beetles that have been recorded in Minnesota, but not all of the beetles found in Minnesota. For a free quote on Japanese beetle control in Minnesota, get in touch with one of our pest control experts. If possible take a picture or collect a specimen to document the identity of the insects. Japanese beetles can be very abundant in some years and less in others. More details regarding JB certification can be found on the National Plant Board Website as listed under "external links." The Japanese beetle is a serious pest of foreign nature to turf and ornamental plants. However, anytime that it can be done is still useful. They need to be applied after the eggs have hatched and the grubs are present. If turf damage has been sporadic the last few years, it may be worth waiting to see if they are a problem. Profile: Photo: Video : American carrion beetle (Necrophila americana)American rose chafer (Macrodactylus subspinosus). However, do not cover plants in bloom that require pollination (i.e. They assume the typical C-shaped position in the soil as other grubs. 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. It is also a pest of several fruit, garden, and field crops, and has a total host range of more than 300 plant species. In one year the Minnesota Department of Agriculture (MDA) trapped more than one million beetles. These large beetles with shiny green- and copper-colored bodies, chew small holes in the leaves leaving a lace-like appearance ( see image 1). Vegetables. Virgin females produce a sex pheromone for mating that is highly attractive to males. The fly Istocheta aldrichi lays eggs on adult Japanese beetles in summer, whereas the wasp Tiphia vernalis parasitizes grubs in the spring. When grub feeding is severe, dead patches of grass develop. The sap from four o’clocks is a mild irritant, causing itching on the skin. ... Video of a Japanese beetle … Once white grubs are nearly full-sized (about 1 inch long), and the turf has begun dying in patches that pull easily from the soil, you can still apply a "rescue" treatment with a fast-acting curative insecticide in September, but expect only partial control. Bacillus thuringiensis galleriae (e.g. This product is low risk to bees and other beneficial insects. Treating in spring is no guarantee that the lawn will not be re-infested again in mid-summer. However, Japanese beetle can also be a pest in soybeans and other agricultural crops as well. Check your plants daily and remove any beetles that you find to minimize feeding damage. Remember that insecticides can pose significant risks to beneficial insects, including pollinators, as well as birds, fish and mammals. Effective curative insecticide are trichlorfon, clothianidin, and carbaryl. Look for beetles in your yard and garden starting in late June and early July. Photo by Jeff Hahn, University of Minnesota Extension. False Japanese beetle compared to Japanese beetle. Repeat applications are necessary. Caution: pyrethroids, carbaryl, and acephate are toxic to bees and other pollinators. Japanese beetle is present in most of the eastern United States and has been present in Minnesota for decades. Healthy turf grass can typically tolerate up to 10 grubs per square foot. Four o’clocks are grown as annuals in Minnesota. Since its discovery, the beetle spr… They were developed by researchers to monitor for the presence of Japanese beetles so that management strategies could be implemented. It is now found throughout the eastern U.S., except for Florida, and continues to move westward. C-shaped, white to cream-colored grubs with a distinct tan-colored head. Products containing pyrethrins (e.g. Caution: Imidacloprid and dinotefuran are very toxic to pollinators. Regents of the University of Minnesota. The Japanese beetle (Popillia japonica), is a common scarab beetle which is causing issues in local gardens, yards, and more recently, in soybean fields. As infestations increase on farms, growers should be vigilant about control in order to prevent extensive leaf damage. Neem oil is effective for several days but repeat applications are necessary. 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. Avoid areas being used by ground-nesting bees. Since larvae feed primarily on the roots of grass, Japanese beetle is most prevalent in urban environments. updated distribution map of Japanese beetles, Outdoor biting insects and insect relatives. 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. Neem oil helps deter Japanese beetles but is less effective when large numbers are present. 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. Plants usually not damaged by Japanese beetles include boxwood, clematis, chrysanthemum, conifers (e.g. ST. PAUL, Minn. (WCCO) — Call it summer’s version of beauty and the beetle – make that Japanese beetles! Bacillus thuringiensis galleriae (Btg) is a bacterial strain that produces a toxin that affects beetle adults and larvae. At first, only a few beetles were found. 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). 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