• Corn Rootworm
• European Corn Borer
• Corn Earworm
• Fall Armyworm
• Corn Leaf Aphid
• Sap Beetle

Insect Pests at Knee High to Maturity

Corn Rootworm

1. Western corn rootworm adult

2. Northern corn rootworm adult

3. rootworm larva head is on the right side

European Corn Borer

1. corn borer eggs	2. corn borer eggs at blackhead stage	3. corn borer larvae hatching	4. corn borer larva
5. corn borer pupal stage	6. female corn borer	7. male corn borer	8. corn borer tunneling
9. corn borer cob damage	10. corn borer larval feeding	11. stalk lodging caused by corn borer	12. corn borer egg mass
13. corn borer boring into stalk	14. corn borer adults, female on left is lighter in colour and larger than male

Corn Earworm

1. Corn earworm egg on a silk	2. Corn earworm larva	3. Corn earworm pupal stage	4. Corn earworm adult
5. Corn earworm in flight	6. Corn earworm male on left, female right	7. characteristic corn earworm frass	8. Corn earworm damage to cob
9. Corn earworm in whorl feeding	10. Corn earworm larvae

Fall Armyworm

1. armyworm eggs uncovered	2. armyworm egg mass	3. Fall armyworm larva	4. Fall armyworm has Y-shaped pattern on head
5. Fall armyworm adult	6. Fall armyworm entry hole in cob	7. Fall armyworm feeding damage	8. Fall armyworm typical feeding damage
9. Fall armyworm has no bands on prolegs

Corn Leaf Aphid

1. wingless aphid	2. winged aphid	3. parasitized aphid or aphid mummy	4. diseased aphid
5. aphids molting their skin	6. aphid infestation	7. aphids are a bluish-green colour	8. ants farming the honeydew produced by aphids
9. Corn leaf aphids	10. Corn leaf aphids can gum up tassels, reducing pollination

Sap Beetle

1. Sap beetle larva	2. close-up of adult sap beetle	3. Sap beetle has two pale yellow spots on each wing cover
4. adult sap beetles attracted to fermenting sugars of damaged corn	5. note sap beetle larvae (red arrows)