Integrated Crop Management News

Document Type


Publication Date



Two groups of white grubs are found in Iowa croplands: the true white grub, which can cause significant stand loss in corn and sometimes soybean; and the annual white grub, which probably does not cause stand loss in either crop. True white grubs are the larvae of June beetles (the big brown beetles that fly around yard lights during May and June evenings). They feed on the roots of seedling plants, causing them to wilt and die. True white grubs have a 3-year life cycle and can reduce plant populations during 2 of these 3 years. Predicting what corn or soybean fields might have problems from true white grubs is nearly impossible.

Copyright Owner

Iowa State University



File Format





The Iowa State University Digital Repository provides access to Integrated Crop Management News for historical purposes only. Users are hereby notified that the content may be inaccurate, out of date, incomplete and/or may not meet the needs and requirements of the user. Users should make their own assessment of the information and whether it is suitable for their intended purpose. For current information on integrated crop management from Iowa State University Extension and Outreach, please visit