2007 Late Season Seed Corn Survey

Table 3-10a, Pest Severities of Seed Corn in Ontario
Field# Northern Leaf Blight Anthracnose Leaf Blight Rust Gray Leaf Spot Stewart's Wilt Common Smut Ear Rot
Field #1
Low
Low
Low
Low
ND
Low
ND
Field #2
Med
Low
Med
Low
ND
Low
Low
Field #3
High
Low
Low
ND
ND
Low
Low
Field #4
ND
Low
ND
Low
Med
ND
ND
Field #5
ND
Low
ND
Low
Med
ND
ND
Field #6
ND
Med
ND
Low
ND
Low
ND
Field #7
Low
Low
Med
Low
ND
Med
Low
Field #8
Low
Low
Med
Low
ND
Low
ND
Field #9
ND
Low
Low
ND
Low
ND
ND
Field#10
Low
ND
Low
Low
ND
Med
ND
Field#11
ND
Low
ND
ND
ND
Low
ND
Field#12
ND
Low
Low
ND
ND
Low
ND
Field#13
ND
Med
Low
ND
ND
Low
ND
Field#14
Low
Low
Low
Low
ND
High
ND
Field#15
Low
Low
Low
Low
ND
Low
ND
Field#16
Med
ND
Low
Low
Low
Low
Low
Field#17
Med
Med
Med
ND
ND
ND
ND
Field#18
ND
Low
Low
ND
ND
High
Low
Field#19
ND
Low
Low
Low
ND
Low
ND
Field#20
ND
Low
Low
Low
ND
Med
Low
Field#21
Low
Low
Low
Low
Low
Med
Low
Field#22
Low
ND
Low
Low
ND
Low
ND
Field#23
ND
Low
ND
Low
ND
ND
ND
Field#24
Low
Low
Low
Low
Low
Low
ND
Field#25
Low
ND
Low
Low
Low
ND
ND
Field#26
Low
ND
Low
Low
Low
Med
ND
Field#27
High
Low
Low
Low
ND
Low
ND
Field#28
Low
Low
Low
Low
ND
Low
ND
Field#29
High
Low
ND
Low
ND
Low
Low
Field#30
Low
Med
Low
Low
Low
Low
Low
Field#31
ND
Low
Low
Low
ND
Med
Low
Field#32
Low
Low
ND
Low
ND
Med
High
Field#33
Low
Low
Low
Low
ND
Low
ND
Field#34
ND
Low
ND
Low
Low
Low
ND
Field#35
ND
Low
Low
ND
ND
Low
ND
Field#36
Low
Low
Low
Low
ND
Low
ND
Field#37
Med
ND
Low
ND
ND
Med
ND
# fields
24
31
30
28
10
32
11


Stewart's Wilt: ELISA test positive
Rust:Common and/or Southern Rust
Ear Rot: Gibberella/Fusarium Ear Rot
Stalk Rot: Gibberella/Fusarium Stalk Rot
Pest severities were based on ECORC's pest screening rating

Leaf Diseases: ND=not detected; Low=less than 5% of leaf area with lesions;Intermediate (Med)=less than 25%of leaf area with lesions; and High=25% of leaf area with lesions; Died=75% of leaf area with lesions, leaves drying.
Ear and Stalk diseases: ND=not detected; Low= less than 5% of plants with disease; Intermediate (Med)=less than 25% of plants with disease; and High=25% of plants with disease.
European corn borer and Corn rootworm: ND=not detected; Low=less than 5% of plants with insect damage; Intermediate (Med)=less than 25% of plants with insect damage; and High=25% of plants with insect damage.
Corn flea beetle and Mites: ND=not detected; Low=less than 5% of leaf area damaged; Intermediate(Med)=less than 25% of leaf area damaged; and High=25% of leaf area damaged.



Table 3-10b, Pest Severities of Seed Corn in Ontario
Field# Stalk Rot European Corn Borer Corn Rootworm Corn Flea Beetle Grasshopper Others
Field #1
Med
ND
ND
ND
ND
Mites
Field #2
ND
ND
ND
ND
ND
Mites
Field #3
High
ND
ND
ND
ND
 
Field #4
ND
Low
ND
ND
Low
 
Field #5
ND
ND
ND
Low
ND
 
Field #6
ND
Low
ND
ND
Low
Mites
Field #7
ND
ND
ND
ND
ND
Mites
Field #8
ND
Low
ND
ND
ND
Mites
Field #9
High
ND
Med
ND
ND
 
Field#10
Med
ND
ND
ND
ND
Mites
Field#11
Low
Low
ND
ND
Low
Mites
Field#12
ND
ND
ND
ND
Low
Mites
Field#13
Med
Low
ND
ND
ND
Mites
Field#14
Low
ND
Low
ND
Low
Mites
Field#15
Low
Low
ND
ND
ND
Bird damage
Field#16
Low
Low
Low
ND
ND
 
Field#17
Med
Low
ND
ND
Low
Mites
Field#18
Med
Low
ND
ND
ND
Mites
Field#19
ND
Low
ND
ND
Low
Mites
Field#20
Low
Low
ND
ND
ND
Mites
Field#21
ND
Low
ND
ND
Low
Eyespot,Mites
Field#22
ND
Med
Low
ND
Low
Mites
Field#23
ND
ND
ND
ND
Low
Very heavy mites
Field#24
ND
Low
Low
ND
Low
Mites
Field#25
ND
Low
ND
ND
Low
Mites
Field#26
ND
Low
ND
ND
Low
Mites
Field#27
ND
Med
ND
ND
ND
Mites
Field#28
ND
Low
ND
ND
ND
Mites
Field#29
ND
Low
Low
ND
ND
 
Field#30
ND
ND
ND
ND
ND
Eyespot,Mites
Field#31
Med
Low
Low
ND
ND
 
Field#32
ND
Low
Low
ND
ND
Mites,bird
Field#33
ND
Low
Low
ND
Low
Mite, MDMV
Field#34
Low
Low
ND
ND
Low
Armyworm
Field#35
ND
Low
ND
ND
Low
Eyespot,Mites
Field#36
ND
Low
ND
ND
ND
Heavy mites
Field#37
Low
Low
ND
ND
ND
Heavy mites
# fields
15
26
9
1
16