South Central Ag Lab Clay Center, NE Tamra Jackson Corn Foliar Fungicides Application Timing Trial...

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


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


2009 Fungicide Timing Trial in NE500 Count Kernel Weight (g)


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


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)


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)



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


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-


2009 Fungicide Timing Trial in NEStay Green (%) assessed on October 14, 2009


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-



2009 Fungicide Timing Trial in NELodging (%) assessed on October 14, 2009


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

%


Non-

Treated

*Lodging (%) defined as corn plants lodged below the ear leaf

2009 Fungicide Timing Trial in NELodging (%) assessed on October 14, 2009


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-


*Lodging (%) defined as corn plants lodged below the ear leaf

2009 Fungicide Timing Trial in NETop-Stalk Lodging (%)


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


*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 (%)


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-


*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


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-


2009 Fungicide Timing Trial in NEArea Under the Disease Progress Curve (AUDPC) for Gray Leaf Spot


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-


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

South Central Ag Lab Clay Center, NE Tamra Jackson Corn Foliar Fungicides Application Timing Trial...

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