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
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 - Leaf Surface

Physoderma Brown Spot

anthracnose-leaf-blight

Anthracnose Leaf Blight

stewarts-bacterial-leaf-blight

Stewart's Bacterial Leaf Blight

gray-leaf-spot

Gray Leaf Spot

southern-corn-leaf-blight

Southern Corn Leaf Blight

northern-corn-leaf-blight
goss-wilt
Eye Spot - Top Side of Leaf 3

Eyespot 
 

common-rust
southern-rust

Southern Rust - Front Surface 

southern-rust

Southern Rust - Back Surface

Tar Spot

Tar Spot

Ear Rots

diplodia-ear-rot

Diplodia Ear Ro

fusarium
gibberella-ear-rot

Gibberella Ear Rot

Aspergillus - On Ear

Aspergillus Ear Rot

aspergillus-ear-rot

Aspergillus Ear Rot

Smut/Virus/Fungal Systemic Diseases

Common Smut - Open Husk 1
corn-lethal-necrosis

Corn Lethal Necrosis

maize-chlorotic-dwarf-virus

Maize Chlorotic Dwarf Virus

maize-dwarf-mosaic-virus

Maize Dwarf Mosaic Virus
 

high-plains-virus

High Plains Virus

Crazy Top - In Field 1

Crazy Top
 

Stalk & Root Rots

Anthracnose Stalk Rot

Charcoal Rot - Root Split

Charcoal Rot

gibberella-stalk-rot

Gibberella Stalk Rot

Fusarium Stalk Rot - At Ground in Field

Fusarium Stalk Rot

red-root-rot

Red Root Rot

 

red root rot

Red Root Rot
 

Diplodia Stalk Rot - Varying Degrees

Diplodia Stalk Rot

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