John Holmes is an ISU Extension field agronomist serving north central Iowa. He can be reached at 515-532-3453 or by emailing jdholmes@iastate.edu. Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Integrated Crop Management News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on June 20, 2011. The information contained within may not be the most current and accurate depending on when it is accessed.ICM NewsCategory: Insects and MitesCrop: CornTags: InsectscaterpillarsscoutingAuthor: Erin Hodgson Associate Professor