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2009 Corn Foliar Fungicides
Application Timing Trial
South Central Ag Lab
Clay Center, NE
Tamra JacksonExtension Plant Pathologist
University of Nebraska-Lincoln
Gray leaf spot (GLS)
was moderately severe
and was the
predominant foliar
disease at this location
again in 2009.
2009 Diseases
Common rust
developed, but
remained at low
incidence and
severity at this
location in 2009.
2009 Diseases
Eyespot and Physoderma
brown spot were present
in this trial, but at very
low incidence and
severity, thus not
justifying ratings for
these diseases at this
location in 2009.
2009 Diseases
2009 Foliar Fungicide Trials
South Central Ag Lab, Clay Center, NE
2005-2006
•High clearance
sprayer used
•Elevated disease risk:
•Continuous corn
•Two corn hybrids:
•DKC 60-18 (GLS
rating 7/fair)
•DKC 62-54 (GLS
rating 4/very good)
•Planting date: 5/6/09
•6 reps
•20 gpa
•Overhead sprinkler
irrigated
2009 Fungicide Timing Trial in NEYield (bu/A)
DKC 60-18 (GLS rating = 7/fair)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
242
260258
252
258
252 252 253256
250
220
230
240
250
260
270
280
Yie
ld (
bu
/A)
Headline Headline AMP QuiltNon-
Treated
*No statistical differences
2009 Fungicide Timing Trial in NEYield (bu/A)
DKC 62-54 (GLS rating = 4/very good)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
258
265
258 257
264
253 253
262
256 257
220
230
240
250
260
270
280
Yie
ld (
bu
/A)
Non-
TreatedHeadline Headline AMP Quilt
*No statistical differences
2009 Fungicide Timing Trial in NE500 Count Kernel Weight (g) DKC 60-18 (GLS rating = 7/fair)
No
n-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
Non-
Treated
174.8
184.1
176.0
178.7
175.7174.2
175.4176.6
183.8
174.8
160
165
170
175
180
185
190
195
200
1 2 3 4 5 6 7 8 9 10
500 C
ou
nt
Kern
el W
eig
ht
(g)
Headline Headline AMP Quilt
*No statistical differences
2009 Fungicide Timing Trial in NE500 Count Kernel Weight (g)
DKC 62-54 (GLS rating = 4/very good)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
188.9
181.0
184.9183.8
185.8183.2
191.3
175.5
188.9
176.3
160
165
170
175
180
185
190
195
200
1 2 3 4 5 6 7 8 9 10
500 C
ou
nt
Kern
el W
eig
ht
(g)
Non-
Treated Headline Headline AMP Quilt
*No statistical differences
2009 Fungicide Timing Trial in NEGray Leaf Spot Disease Severity (%)
DKC 60-18 (GLS rating = 7/fair)
Rating Date
Treatment
0
2
4
6
8
10
12
14
16
18
20
7/13/2009 V16/V17
7/27/2009 R2
8/10/2009 R4
8/24/2009 R5 (75% Dent)
9/8/2009 R5 (100% Dent)
Dis
ea
se
Se
ve
rity
(% t
ota
l le
af
are
a c
overa
ge)
Non-Treated
Headline (VT)
Headline (VT+17d)
Headline (VT+32d)
Headline AMP (VT)
Headline AMP (VT+17d)
Headline AMP (VT+32d)
Quilt (VT)
Quilt (VT+17d)
Quilt (VT+32d)
2009 Fungicide Timing Trial in NEGray Leaf Spot Disease Severity (%)
DKC 62-54 (GLS rating = 4/very good)
Rating Date
Treatment
0
2
4
6
8
10
12
14
7/13/2009 V16/V17
7/27/2009 R2
8/10/2009 R4
8/24/2009 R5 (75% Dent)
9/8/2009 R5 (100% Dent)
Dis
ea
se
Se
ve
rity
(% t
ota
l le
af
are
a c
ove
rag
e)
Non-Treated
Headline (VT)
Headline (VT+17d)
Headline (VT+32d)
Headline AMP (VT)
Headline AMP (VT+17d)
Headline AMP (VT+32d)
Quilt (VT)
Quilt (VT+17d)
Quilt (VT+32d)
2009 Fungicide Timing Trial in NEGray Leaf Spot Progression up the plant (1-18 scale)
DKC 60-18 (GLS rating = 7/fair)
August 10, 2009 rating date (R4 reproductive stage)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
a 16.2 bc
14.3c
14.0
bc14.3
abc14.8
abc15.0
abc15.5
abc15.5
ab16.0
ab15.8
0
2
4
6
8
10
12
14
16
18
1 2 3 4 5 6 7 8 9 10
Gra
y L
ea
f S
po
t P
rog
res
sio
n(L
ea
f #
fro
m p
lan
t b
as
e)
Headline AMP QuiltNon-Treated Headline
2009 Fungicide Timing Trial in NEGray Leaf Spot Progression up the plant (1-18 scale)
DKC 62-54 (GLS rating = 4/very good)
August 10, 2009 rating date (R4 reproductive stage)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
Non-Treated Headlineab
14.2ab
13.5b
13.0b
12.8
ab13.7
a 14.5 ab
13.7
a 14.3
ab14.2
a 14.7
0
2
4
6
8
10
12
14
16
18
1 2 3 4 5 6 7 8 9 10
Gra
y L
ea
f S
po
t P
rog
res
sio
n(L
ea
f #
fro
m p
lan
t b
as
e)
Headline AMP Quilt
2009 Fungicide Timing Trial in NEStay Green (%) assessed on October 14, 2009
DKC 60-18 (GLS rating = 7/fair)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
c 2.8
a 9.3
ab7.4 b
6.5
ab7.4
ab6.9
bc5.1
ab6.5
ab6.5
ab7.4
0
2
4
6
8
10
12
14
16
1 2 3 4 5 6 7 8 9 10
Sta
y G
ree
n %
Non-
TreatedHeadline Headline AMP Quilt
2009 Fungicide Timing Trial in NEStay Green (%) assessed on October 14, 2009
DKC 62-54 (GLS rating = 4/very good)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
6.06.9
4.6 4.6
6.55.6
6.0
4.6
6.57.4
0
2
4
6
8
10
12
14
16
1 2 3 4 5 6 7 8 9 10
Sta
y G
ree
n %
Non-
TreatedHeadline Headline AMP Quilt
*No statistical differences
2009 Fungicide Timing Trial in NELodging (%) assessed on October 14, 2009
DKC 60-18 (GLS rating = 7/fair)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
a 28.3
bc7.9 c
4.2
bc7.5 c
4.6
bc10.8 bc
8.8 c 5.4
bc7.9
b 13.8
0
5
10
15
20
25
30
35
40
1 2 3 4 5 6 7 8 9 10
Lo
dg
ing
%
Headline Headline AMP Quilt
Non-
Treated
*Lodging (%) defined as corn plants lodged below the ear leaf
2009 Fungicide Timing Trial in NELodging (%) assessed on October 14, 2009
DKC 62-54 (GLS rating = 4/very good)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
a 17.1 ab
15.0 ab11.7
a 17.1
b 7.5
b 9.2
ab9.6
ab11.7 b
8.8b
8.3
0
5
10
15
20
25
30
35
40
1 2 3 4 5 6 7 8 9 10
Lo
dg
ing
%
Non-
TreatedHeadline Headline AMP Quilt
*Lodging (%) defined as corn plants lodged below the ear leaf
2009 Fungicide Timing Trial in NETop-Stalk Lodging (%)
DKC 60-18 (GLS rating = 7/fair)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
a 28.5
b 3.6
b 3.9
b 7.0
b 3.0
b 5.8
b 4.9
b 5.5 b
3.2
b 5.4
0
5
10
15
20
25
30
35
40
1 2 3 4 5 6 7 8 9 10
To
p-S
talk
Lo
dg
ing
%
Non-
Treated
Headline Headline AMP Quilt
*Top-Stalk Lodging (%) was defined as lodging at or above the ear node and appeared
to be due primarily to anthracnose top dieback
2009 Fungicide Timing Trial in NETop-Stalk Lodging (%)
DKC 62-54 (GLS rating = 4/very good)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
4.72.6
4.2 3.31.9 2.5 2.7 2.2 1.8 1.5
0
5
10
15
20
25
30
35
40
1 2 3 4 5 6 7 8 9 10
To
p-S
talk
Lo
dg
ing
%
Non-
Treated Headline Headline AMP Quilt
*Top-Stalk Lodging (%) was defined as lodging at or above the ear node and appeared
to be due primarily to anthracnose top dieback
2009 Fungicide Timing Trial in NEArea Under the Disease Progress Curve (AUDPC) for Gray Leaf Spot
DKC 60-18 (GLS rating = 7/fair)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
a 558.2
e 305.5
e 302.0
e 311.3
cd391.7
d 376.4
cd414.3
bc453.2
b 478.2
b 486.2
0
100
200
300
400
500
600
700
1 2 3 4 5 6 7 8 9 10
Are
a U
nd
er
the
Dis
ea
se
Pro
gre
ss
C
urv
e (
AU
DP
C)
for
Gra
y L
ea
f S
po
t
Non-
TreatedHeadline Headline AMP Quilt
2009 Fungicide Timing Trial in NEArea Under the Disease Progress Curve (AUDPC) for Gray Leaf Spot
DKC 62-54 (GLS rating = 4/very good)N
on
-
Tre
ate
d
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
Application
Timing
R4
8/1
8/0
9
VT
/R1
7/1
7/0
9
R3
8/3
/09
R4
8/1
8/0
9
a 264.3
e 189.0
de204.5
e 193.5
cd225.0
cd215.8
bc235.1
bc234.1
ab249.6
ab248.3
0
100
200
300
400
500
600
700
1 2 3 4 5 6 7 8 9 10
Are
a U
nd
er
the
Dis
ea
se
Pro
gre
ss
C
urv
e (
AU
DP
C)
for
Gra
y L
ea
f S
po
t
Non-
Treated Headline Headline AMP Quilt
Acknowledgments
• Casey Schleicher, Technologist
• Jae Behn, Technologist
• Kim Miller, Technician
• UNL South Central Ag Lab (SCAL) Staff