Japanese Beetles Found in Neighboring Counties

Phone calls in neighboring counties have been trickling in regarding sightings of Japanase beetles. Story, Tama, and Polk counties have reported relatively low outbreak numbers thus far this summer, with similar trends throughout the eastern 2/3 of the state. However, "hordes" of beetles seem to be occurring in our western Iowa counties this summer. According to the Horticulture & Home Pest News article released in 2010, Japanese beetles feed on a wide variety of landscape plants. For a list of least and most favorable host plants, click http://www.ipm.iastate.edu/ipm/hortnews/2010/7-14/japanesebeetle.html. Japanese beetles also feed on field crops.
 
Even though population numbers have remained low in neighboring counties and not yet recorded in Jasper County, that doesn't mean the beetles will not be a concern for gardeners this year. Gardeners already are reporting higher populations now than they did one year ago. Feeding damage is fairly easy to distinguish from other foliar eating insects, with an overall lacy-look to the leaves, generally avoiding feeding from leaf veins. Control of Japanese beeetles includes both synthetic and organic insecticides when beetles have reached their economic thresholds. Organic insecticides that have shown deterring capabilities possess a shorter residual period so reapplying treatment may be needed, but would be more apporpriate for use on food crops. 
 
Go to http://www.ipm.iastate.edu/ipm/hortnews/2016/07-01/clinic.html for a recent Horticulture and Home Pest News article relating to Japanese beetles. 

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