2010 Foliar Fungicides on Corn Product Comparisons

South Central Ag LabClay Center, NE

Tamra JacksonExtension Plant Pathologist

University of Nebraska-Lincoln

Gray leaf spot occurred at very low severity

levels (< 4%) and was the predominant foliar

disease at the end of the growing season at this location. Gray leaf spot reached the ear leaf by early- to mid-August.

2010 Diseases

Common rust developed and was the predominant

early-season disease, likely due to plentiful early-

season moisture. Disease severity (

Southern rust was present and was identified in this

trial on Aug. 13. This disease was observed at very low severity (

Eyespot, common smut and Physoderma brown spot were also present in this trial, but at very

low incidence and severity levels, thus not

justifying ratings for these diseases at this

location in 2010.

2010 Diseases

Goss’s bacterial wilt and leaf blight was confirmed in this trial. This disease

was first observed on Jul. 29 and occurred in

this trial at very low incidence and severity

levels.

2010 Diseases

2010 Foliar Fungicide Trials

South Central Ag Lab, Clay Center, NE

2005-2006

•High clearance sprayer used

•Elevated disease risk

•Continuous corn

•Corn hybrid:

•DKC 61-69 (GLS rating 5/9,”good”)

•Planting date: 5/5/10

•Target plant population of 30,000 plants/A

•6 reps

•20 gpa at 40 psi

•Overhead sprinkler irrigated

•Alley width & row spacing = 30 inches

2010 Fungicide Comparison Trial in NEGray Leaf Spot Disease Severity (%)

R1 Application 7/15/10

Rating Date & Growth Stage

Treatment

0

1

2

3

4

5

7/15/2010 R1

7/29/2010 R3

8/13/2010 R4

8/27/2010 R5 (starch line 1/2 up kernel)

Dis

ease

Sev

erity

%(%

tota

l lea

f are

a co

vera

ge)

Non-treated Control

Headline EC, 6 oz/A

Headline AMP, 10 oz/A

Evito, 5.7 oz/A

Quilt, 14 oz/A

Quilt Xcel, 10.5 oz/A

Stratego, 10 oz/A

Stratego YLD, 5 oz/A

Quadris, 9 oz/A

2010 Fungicide Comparison Trial in NEArea Under the Disease Progress Curve (AUDPC) for Gray Leaf Spot

R1 Application 7/15/10N

on-

Trea

ted

Hea

dlin

e EC

6

oz/A

Qui

lt

14

oz/

A

Stra

tego

10

oz/

A

Treatment

Qui

lt Xc

el

10.5

oz/

A

Evito

5.7

oz/A

Stra

tego

YLD

5

oz/A

Hea

dlin

e AM

P 10

oz/

A

Qua

dris

9oz

/A

67.2

28.7 29.334.9

23.7 24.028.7 29.4

22.6

0

10

20

30

40

50

60

70

80

1 2 3 4 5 6 7 8 9

Are

a U

nder

the

Dis

ease

Pr

ogre

ss C

urve

(AU

DPC

) for

gr

ay le

af s

pot

a

bcc

bbc

cbc

cbc

*Treatments with different letters are statistically different. Coefficient of variation is 21.1%

2010 Fungicide Comparison Trial in NECommon rust Disease Severity (%)

R1 Application 7/15/10

Rating Date & Growth Stage

Treatment

0

1

2

3

4

5

7/15/2010 R1

7/29/2010 R3

8/13/2010 R4

8/27/2010 R5 (starch line 1/2

up kernel)

Dis

ease

Sev

erity

%(%

tota

l lea

f are

a co

vera

ge)

Non-treated Control

Headline EC, 6 oz/A

Headline AMP, 10 oz/A

Evito, 5.7 oz/A

Quilt, 14 oz/A

Quilt Xcel, 10.5 oz/A

Stratego, 10 oz/A

Stratego YLD, 5 oz/A

Quadris, 9 oz/A

2010 Fungicide Comparison Trial in NEArea Under the Disease Progress Curve (AUDPC) for Common Rust

R1 Application 7/15/10N

on-

Trea

ted

Hea

dlin

e EC

6

oz/A

Qui

lt

14

oz/

A

Stra

tego

10

oz/

A

Treatment

Qui

lt Xc

el

10.5

oz/

A

Evito

5.7

oz/A

Stra

tego

YLD

5

oz/A

Hea

dlin

e AM

P 10

oz/

A

Qua

dris

9oz

/A

113.0

97.6 101.2 93.8

73.5

89.598.6

88.281.8

0

30

60

90

120

150

1 2 3 4 5 6 7 8 9

Are

a U

nder

the

Dis

ease

Pr

ogre

ss C

urve

(AU

DPC

) for

co

mm

on ru

st

a

bbc

d

bcab ab

bcdcd

*Treatments with different letters are statistically different. Coefficient of variation is 13.7%

2010 Fungicide Comparison Trial in NEGray Leaf Spot Progression up the plant (Leaf number on 1-19 scale)

R1 Application 7/15/10, August 13, 2010 rating date (R4 reproductive stage)N

on-

Trea

ted

Hea

dlin

e EC

6

oz/A

Qui

lt

14

oz/

A

Stra

tego

10

oz/

A

Treatment

Qui

lt Xc

el

10.5

oz/

A

Evito

5.7

oz/A

Stra

tego

YLD

5

oz/A

Hea

dlin

e AM

P 10

oz/

A

Qua

dris

9oz

/A

16.0

12.7 12.814.2

12.8 12.3 12.7 13.0 12.2

0

2

4

6

8

10

12

14

16

18

20

1 2 3 4 5 6 7 8 9

Gra

y Le

af S

pot P

rogr

essi

on(L

eaf #

from

Pla

nt B

ase)

a

c ccb

c c c c

*Treatments with different letters are statistically different. Coefficient of variation is 7.5%

2010 Fungicide Comparison Trial in NEStay Green % assessed on September 12, 2010

R1 Application 7/15/10N

on-

Trea

ted

Hea

dlin

e EC

6

oz/A

Qui

lt

14

oz/

A

Stra

tego

10

oz/

A

Treatment

Qui

lt Xc

el

10.5

oz/

A

Evito

5.7

oz/A

Stra

tego

YLD

5

oz/A

Hea

dlin

e AM

P 10

oz/

A

Qua

dris

9oz

/A

28.9

38.2 38.234.2 35.3 35.3

36.4 34.937.1

0

10

20

30

40

50

1 2 3 4 5 6 7 8 9

Stay

Gre

en % c

a abc ab ab ab bc

ab

*Treatments with different letters are statistically different. Coefficient of variation is 7.2%

2010 Fungicide Comparison Trial in NEPush Lodging % assessed on October 7, 2010

R1 Application 7/15/10N

on-

Trea

ted

Hea

dlin

e EC

6

oz/A

Qui

lt

14

oz/

A

Stra

tego

10

oz/

A

Treatment

Qui

lt Xc

el

10.5

oz/

A

Evito

5.7

oz/A

Stra

tego

YLD

5

oz/A

Hea

dlin

e AM

P 10

oz/

A

Qua

dris

9oz

/A

45.0

22.5 20.8 20.0 20.8 19.2

25.0

18.3 16.7

0

10

20

30

40

50

1 2 3 4 5 6 7 8 9

Push

Lod

ging

%

a

b b b b b

b

bb

*Treatments with different letters are statistically different. Coefficient of variation is 45.5%

2010 Fungicide Comparison Trial in NE500 Count Kernel Weight (g)

R1 Application 7/15/10N

on-

Trea

ted

Hea

dlin

e EC

6

oz/A

Qui

lt

14

oz/

A

Stra

tego

10

oz/

A

Treatment

Qui

lt Xc

el

10.5

oz/

A

Evito

5.7

oz/A

Stra

tego

YLD

5

oz/A

Hea

dlin

e AM

P 10

oz/

A

Qua

dris

9oz

/A

190.3191.7 191.8 191.7

193.4

190.9 190.9 191.1

194.7

180

185

190

195

200

1 2 3 4 5 6 7 8 9

500

Cou

nt K

erne

l Wei

ght (

g)

*No statistical differences between treatments. Coefficient of variation is 2.6%

2010 Fungicide Comparison Trial in NEGrain Moisture %

R1 Application 7/15/10N

on-

Trea

ted

Hea

dlin

e EC

6

oz/A

Qui

lt

14

oz/

A

Stra

tego

10

oz/

A

Treatment

Qui

lt Xc

el

10.5

oz/

A

Evito

5.7

oz/A

Stra

tego

YLD

5

oz/A

Hea

dlin

e AM

P 10

oz/

A

Qua

dris

9oz

/A

17.2 17.5 17.4 17.3 17.4 17.3 17.5 17.5 17.6

02468

101214161820

1 2 3 4 5 6 7 8 9

Gra

in M

oist

ure

%

*No statistical differences between treatments. Coefficient of variation is 2.5%

*Harvest date: October 12

2010 Fungicide Comparison Trial in NEYield (bu/A)

R1 Application 7/15/10N

on-

Trea

ted

Hea

dlin

e EC

6

oz/A

Qui

lt

14

oz/

A

Stra

tego

10

oz/

A

Treatment

Qui

lt Xc

el

10.5

oz/

A

Evito

5.7

oz/A

Stra

tego

YLD

5

oz/A

Hea

dlin

e AM

P 10

oz/

A

236 234238

234237 238 236

241 243

200

210

220

230

240

250

1 2 3 4 5 6 7 8 9

Yiel

d (b

u/A

)

Qua

dris

9oz

/A

*No statistical differences between treatments. Coefficient of variation is 4.3%

Acknowledgments

• Casey Schleicher, Technologist• Jae Behn, Technologist• Kim Miller, Technician• UNL South Central Ag Lab (SCAL) Staff

Department of Plant PathologyUniversity of Nebraska-Lincoln

Institute of Agriculture and Natural Resources

2010 Foliar Fungicides on Corn Product Comparisons���South Central Ag Lab�Clay Center, NE�Slide Number 2Common rust developed and was the predominant early-season disease, likely due to plentiful early-season moisture. Disease severity (