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University of Nebraska–Lincoln

Department of Entomology

Corn Pest Diagnostic Key - Stage 2

stage II cornStage II. Emergence to Knee-High Corn (VE to V8)

 

Stunting or Wilting
wireworms

Wireworm
white grub

White Grub
chinch bug

Chinch Bug
corn root aphid

Corn Root Aphid

 

Center Leaves Dying or Dead
wireworms

Wireworm
black cutworm

Black Cutworm
stalk borer

Stalk Borer

 

Unnatural Growth (Stem Twisting or Excessive Tillering)
stalk borer

Stalk Borer
billbug

Billbug

 

Removal of Plant Tissue - Irregular Narrow Lines Scratched From the Top of the Tissue
flea beetle

Flea Beetle

 

Removal of Plant Tissue - Whole Plants Cut Off Near Base
black cutworm

Black Cutworm
sod webworm

Sod Webworm

 

Removal of Plant Tissue - Chunks of Leaf Tissue or Entire Leaves Eaten
stalk borer

Stalk Borer
armyworm

Armyworm
dingy cutworm

Dingy Cutworm
southern corn leaf beetle

Southern Corn

Leaf Beetle

 

Removal of Plant Tissue - Green Tissue Between Upper and Lower Leaf Surfaces Removed
corn blotch leafminer

Corn Blotch

Leafminer


Planting to EmergenceEmergence to Knee-High
Knee-High to TasselingTasseling to Full Maturity
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