Corn Rootworm Gallery

Corn Rootworm (CRW)

When: Early June to mid July (larvae) and mid July to September (adults)

Damage: Larvae feed on roots and cause "goosenecking" in stalks. Adults leave feeding tracks on leaf tissue and clip silks.

Read more about CRW in OMAFRA's Agronomy Guide.

European Chafer (White Grub)

When: May to early June

Damage:  Look for stunted or wilting plants

Read more about European Chafers in OMAFRA's Agronomy Guide.

Flea Beetles

When: Early May to the end of June

Damage: Flea beetles feed on leaf tissue; look for feeding tracks running parallel to leaf veins on the upper surface of the leaf.

Read more about Flea Beetles in OMAFRA's Agronomy Guide.

Wireworm

When: Beginning of May until early-mid June

Damage: Wireworms feed on seed and cause plant stunting/wilting.
 

Read more about Wireworm in OMAFRA's Agronomy Guide.

Fall Armyworm

When: Mid July to the end of September

Damage: Larvae feed on leaf tissue, tassels, and ears.  On the leaves, look for ragged holes, and on the ears, look for a side entry hole and feeding throughout.

Read more about Fall Armyworm in OMAFRA's Agronomy Guide.

True Armyworm

When: Late May to mid July

Damage: Larvae feed on leaf tissue, either leaving ragged holes or eating away the entire leaf except the midrib.

Read more about True Armyworm in OMAFRA's Agronomy Guide.

Black Cutworm

When: Beginning of May to mid June

Damage: Look for stunted/wilting or cut plants and for ragged holes in the leaves.

Read more about Black Cutworm in OMAFRA's Agronomy Guide.

European Corn Borer (ECB)

When: Mid June to the end of September

Damage: At the whorl stage, look for pinhole feeding on leaves.  Later in the season, look for broken tassels, frass at axils, and broken stalks caused by tunneling.  ECB also feed on ears.

Read more about ECB in OMAFRA's Agronomy Guide.

Corn Earworm

When: Mid July through the end of September

Damage: Feeding on tassels and ears.  Look for clipped silks and ear feeding concentrated at the tip with no side hole.

Read more about Corn Earworm in OMAFRA's Agronomy Guide.

Western Bean Cutworm (WBC)

When: Mid July to the end of September

Damage: WBC feed on ears and tassels; look for clipped silks and feeding throughout ear with a side entry hole.

Read more about WBC in OMAFRA's Agronomy Guide.

Corn Leaf Aphid

When: Mid July to the end of September

Damage: Look for discoloured/sticky tassels.

Read more about Corn Leaf Aphid in OMAFRA's Agronomy Guide.

Seedcorn Maggot

When: Beginning of May through early June

Damage: Look for seed feeding.

Read more about Seedcorn Maggot in OMAFRA's Agronomy Guide.