A few areas have experienced high populations of white grubs as corn is approaching the V5 growth stage.
Watch for True Armyworms in Wheat
Scout emerging corn for insects; don't assume protection
July 3, 2008 - Issue 14, Pest & Crop Newsletter, Entomology
Armyworm Control: How To Get Rid of Armyworms
White grubs (corn) - Bugwoodwiki
Grape Colaspis Damages Soybeans and Corn
White Grubs In Garden Facts, Diet, Habitat & Life Cycle
Drone as New Tech to Battle the Crop-Devouring Fall Armyworm
Stop These Early Season Pests
Identify and Control Armyworms
Armyworm in corn