October 5, 2020
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 |
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 |
All Ear & Kernel Rots |
Gray Leaf Spot, Head Smut, Charcoal Rot, Diplodia Stalk Rot, Fusarium Stalk Rot, Gibberella Stalk Rot, Red Root Rot |
Leaf Diseases

Physoderma Brown Spot

Anthracnose Leaf Blight

Stewart's Bacterial Leaf Blight

Gray Leaf Spot

Southern Corn Leaf Blight

Eyespot

Southern Rust - Front Surface

Southern Rust - Back Surface

Tar Spot
Ear Rots

Diplodia Ear Rot

Gibberella Ear Rot

Aspergillus Ear Rot

Aspergillus Ear Rot
Smut/Virus/Fungal Systemic Diseases

Corn Lethal Necrosis

Maize Chlorotic Dwarf Virus

Maize Dwarf Mosaic Virus

High Plains Virus

Crazy Top
Stalk & Root Rots

Anthracnose Stalk Rot

Charcoal Rot

Gibberella Stalk Rot

Fusarium Stalk Rot

Red Root Rot

Red Root Rot

Diplodia Stalk Rot
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