Consider a foliar insecticide during tasseling and silking if: there are 3 or more beetles per ear, silks have been clipped to less than 1/2 inch, AND pollination is less than 50% complete. SUBSCRIBE NOW. Feeding on grass roots, Japanese beetle grubs damage lawns, golf courses, and pastures. Japanese beetle adults are difficult to control and one way to limit the impact of adult beetle defoliation may be to select plants that the Japanese beetles tend to avoid. Furthermore, the mild winter of 2019/2020 should positively influence overwintering survival. $3 for 3 months. Japanese Beetles Emerging In Western Iowa Justin Hellinga July 3, 2020 IARN — A well-known pest of turfgrass and landscapes in the United States is making its presence known in parts of Iowa. That’s kind of the hot spot. Copyright © 2020 Iowa State University of Science and Technology. They also damage the foliage and fruit of more than 400 species of flowers, shrubs and other plants. Winds light and variable.. Partly cloudy skies this evening will become overcast overnight. “It looks like they’ll then go north from that area and then east. The Japanese beetle is a well-known pest of turfgrass and landscapes in the eastern United States. Japanese beetle is present in most of the eastern United States and has been present in Minnesota for decades. Erin Hodgson, Iowa State University Extension entomologist, said activity for the annual pest has been on par with previous years, … Several Iowa State University Extension and Outreach Field Agronomists have reported fields with high numbers of grubs this spring. Links to this article are strongly encouraged, and this article may be republished By Laura Jesse, Plant & Insect Diagnostic Clinic As Japanese beetles are spreading throughout Iowa and populations are increasing, more and more gardeners are dealing with these very hungry garden pests. Because it lacks a natural predator, the Japanese beetle is a bit difficult to control. This pest is considered to be an invasive species. Japanese beetles are very mobile and will find your vineyard even if you treated for the larvae that are in your soil now. Plant Injury and Management The Japanese Beetle is a notorious pest that is not native to North America. The state’s Japanese beetle infestation spread from 27 counties in 2015 to 30 in 2016, according to the Nebraska Department of Agriculture. In the spring grubs will feed, pupate and adults will emerge. Gypsy Moth Survey and Eradication Program. There was an error processing your request. While they might not have been as active as in past years, Japanese beetles still caused issues for farmers in the Midwest in 2020. Jul 16, 2020. https://kiwaradio.com/ag-news/japanese-beetles-emerging-in-western-iowa These are the dark, shiny beetles and they kind of have a metallic color to them and they have little white tufts. While they might not have been as active as in past years, Japanese beetles still caused issues for farmers in the Midwest in 2020. A review of the literature regarding this insect shows that the adults need about 1,030 growing degree days (base 50 degrees F) to complete development, says Erin Hodgson, Iowa State University Extension entomologist. Fig 1. The following list of the Japanese beetle's most‑ and least‑favored woody plants may be useful to you if you are designing new landscapes. A Japanese beetle in a Shenandoah corn field on 7/2/2020 - Photo by Brent Barnett/Iowa Agribusiness Radio Network. The information “This year compared to other years we are probably a little bit ahead based on kind of the numbers we tracked in the Fremont, Mills, Montgomery, and Page County areas,” Saeugling said. It is that time of year again when the sun is high, the air is warm, and the Japanese beetles arrive in droves to eat all of the plants you bought this year! 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