Pest	Corn Stage	Symptoms
Seed Maggot	Seed	No Emergence
Wireworm	Seed & Seedling	No Emergence or Dead Early Whorl
Black Cutworm	Seedling to 6 Leaf	Below ground injury & above ground cutting
Stalk Borer	Seedling to Early Whorl	Stalk bored above ground
Armyworm	Pre-Whorl to Whorl	Foliar Injury
Note: Significant in no-till corn in grassy cover or hay.
Corn Borer	Early Whorl to Harvest	Foliar shot holes, stalk & ear tunneling
Rootworm (Lv)	June & July	Root injury & lodging
Note: Predominantly a problem on continuous corn.
Rootworm (Ad)	July & August	Foliar & Silk Injury
Corn Leaf Aphid	Late Whorl & Tassel	Honey dew & Pollination Loss

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