Seed Corn Best Management Practices for Ontario
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Seed Corn Disease Images 2 - Corn Leaf Diseases
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Seedling Diseases
Corn Leaf Diseases
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Table of Contents
Anthracnose Leaf Blight
Northern Leaf Blight
Eyespot
Bacterial Leaf Blight or Wilt (Stewart's Wilt)
Grey Leaf Spot
Common Rust
Smut, Common and Head
Crazy Top Downy Mildew
Maize Dwarf Mosaic Virus
Sugar Cane Mosaic Virus
Wheat Streak Mosaic Virus
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Corn Leaf Diseases
Anthracnose
1.
Anthracnose
lesions
2.
Anthracnose
lesions
3.
Anthracnose
lesions
4.
Anthracnose
lesions
5.
Anthracnose
lesions
6.
leaf spots or ascervuli
7.
close-up of ascervuli
8.
setae or hair-like
structures in ascervuli
9.
top die-back
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Northern Leaf Blight
1.
early infection
2.
elliptical lesions
3.
Northern leaf blight
lesions
4.
Northern leaf blight
lesions
5.
Northern leaf blight
lesions
6.
Northern leaf
blight lesions
7.
Northern leaf
blight lesions
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Eyespot
1.
round or
oval spots
2.
lesions have tan
or brown centres
3.
translucent halos
4.
lesions have brown
or purple margins
5.
Eyespot lesions
6.
Eyespot lesions
7.
Eyespot
lesions
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Bacterial Leaf Blight or Wilt (Stewart's Wilt)
1.
bacterial ooze
2.
yellow streaks
3.
yellow streaks
4.
yellow streaks
5.
yellow
streaks
6.
Stewart's wilt
symptoms
7.
Stewart's wilt
symptoms
8.
Stewart's wilt
symptoms
9.
crown rot
10.
differences in
susceptibility
11.
effect on yield
12.
Stewart's wilt
13.
Stewart's wilt
14.
Corn flea beetle
is a vector of
stewart's wilt
15.
cut diseased leaf
at base to check for
bacterial ooze
16.
bacterial ooze
from plant
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Grey Leaf Spot
1.
early symptoms
2.
rectangular
lesions
3.
Grey leaf spot
4.
severe infection
5.
field view
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Common Rust
1.
yellow flecks
develop first
2.
rust pustules
breaking through
3.
close-up of
pustules
4.
brick red colour
5.
leaf yellowing
6.
Rust
7.
Rust
8.
Rust pustules
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Smut, Common and Head
1.
Common smut
2.
young plants
most susceptible
3.
galls replace
kernels
4.
greyish coloured
smut balls develop
5.
release
of spores
6.
Common smut
7.
Head smut
8.
Head smut
wire brush symptom
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Crazy Top Downy Mildew
1.
leafy tissue
2.
leafy tissue
3.
excessive growth
Maize Dwarf Mosaic Virus
1.
spots give mottled
or mosaic appearance
2.
spots develop into
narrow streaks
3.
red streaks may
develop later
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Sugar Cane Mosaic Virus
1.
similar to maize
dwarf mosaic virus
Wheat Streak Mosaic Virus
1.
oval to elliptical spots
and yellowish streaks
2.
purpling may
appear later
For further information:
msantavy@seedcorngrowers.on.ca
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