8 MIN READ

Corn Disease Calendar

October 3, 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 VirusNorthern 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 NecrosisAll Ear & Kernel RotsGray 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 image

Stewart's Bacterial Leaf Blight

gray-leaf-spot image

Gray Leaf Spot

southern-corn-leaf-blight image

Southern Corn Leaf Blight

eyespot

Eyespot

southern-rust

Southern Rust - Front Surface

southern-rust

Southern Rust - Back Surface

Tar Spot

Tar Spot


Ear Rots

diplodia-ear-rot

Diplodia Ear Rot

gibberella-ear-rot

Gibberella Ear Rot

aspergillus

Aspergillus Ear Rot

aspergillus-ear-rot

Aspergillus Ear Rot


Smut/Virus/Fungal Systemic Diseases

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

Crazy Top


Stalk & Root Rots

anthracnose-stalk-rot

Anthracnose Stalk Rot

charcoal rot

Charcoal Rot

gibberella-stalk-rot

Gibberella Stalk Rot

fusarium stalk rot

Fusarium Stalk Rot

red-root-rot

Red Root Rot


red root rot

Red Root Rot

diplodia stalk rot

Diplodia Stalk Rot

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