October 5, 2020

Corn Disease Calendar

Here is an overview of corn diseases throughout the season.

Scouting for Corn Diseases

Early Season
Emergence to knee-high

Seeding Blights

Anthracnose Leaf Blight, Bacterial Wilt and
Bacterial Leaf Blight (Stewart’s Wilt,
Stewart’s Disease), Goss’s Wilt,
Physoderma Brown Spot, Common Smut,
High Plains Virus

Mid Season
Knee-high to tasseling

Anthracnose Leaf Blight, Bacterial Wilt and
Bacterial Leaf Blight (Stewart’s Wilt,
Stewart’s Disease), Goss’s Wilt,
Physoderma Brown Spot, Common Smut,
High Plains Virus

Northern Leaf Blight, Southern Leaf Blight,
Common Rust, Southern Rust, Crazy Top,
Sorghum Downy Mildew,
Anthracnose Top Dieback & Stalk Rot,
Bacterial Stalk Rot, Pythium Stalk Rot,
Maize Chlorotic Dwarf Virus,
Maize Dwarf Mosaic Virus,
Corn Lethal Necrosis, Eyespot, Tar Spot

Late Season
Tasseling to maturity

Anthracnose Leaf Blight, Bacterial Wilt and
Bacterial Leaf Blight (Stewart’s Wilt,
Stewart’s Disease), Goss’s Wilt,
Physoderma Brown Spot, Common Smut,
High Plains Virus

All Ear & Kernel Rots

Gray Leaf Spot, Head Smut, Charcoal Rot,
Diplodia Stalk Rot, Fusarium Stalk Rot,
Gibberella Stalk Rot, Red Root Rot