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Corn Pest Diagnostic Key

stage III corn

Stage III. Knee-High to Tasseling Corn (V8 to VT)

 

Leaf Tissue Removed:
Chunks of Plant Tissue Removed From Leaf Margins, or Ragged Holes in Leaves
stalk borer
Stalk Borer
armyworm
Armyworm
fall armyworm
Fall Armyworm
grasshopper
Grasshopper
corn earworm
Corn Earworm

 

Leaf Tissue Removed:
Small, Circular Holes or Elongated Lesions in Leaves
European corn borer
European
Corn Borer
southwestern corn borer
Southwestern
Corn Borer
billbug
Billbug

 

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

 

Stalks Malformed: Lodging or Growing Upward in a Gooseneck Shape
corn rootworm larvae
Corn Rootworm Larvae

 

Holes Bored in Stalk
stalk borer
Stalk
Borer
European corn borer
European
Corn Borer
southwestern corn borer
Southwestern
Corn Borer