Texas

• Managing Insect and Mite Pests of Texas Corn (Texas A&M) (bad link)

Out-of-State

• Corn Insect Pests: A Diagnostic Guide (Univ. of Missouri, Excellent, (PDF – large file)
• Corn Insect Information (Univ. of Illinois)
• Insect Pests of Field Crops (Ohio State Univ.)