CORN DISEASE MANAGEMENTCPN-2011-W

1Corn Disease Management

Fungicide Efficacy for Control of Corn DiseasesThe Corn Disease Working Group (CDWG) developed ratings for how well fungicides control major corn diseases in the United States. The CDWG determined efficacy ratings for each fungicide listed in the table by field testing the materials over multiple years and locations. Ratings are based on the product’s level of disease control and do not necessarily reflect yield increases obtained from product application.

A product’s efficacy depends upon proper application timing, rate, and application method as determined by the product label and overall disease level in the field at the time of application. Differences in efficacy among each fungicide product were determined by directly comparing products in field tests using a single application of the labeled rate. For application timing and use considerations, contact your local cooperative extension service.

The table includes marketed products available that have been tested over multiple years and locations. The table is not intended to be a list of all labeled products. Additional fungicides are labeled for disease on corn, including contact fungicides such as chlorothalonil. Other fungicides may be available for diseases not listed in the table, including Diplodia, Gibberella, and Fusarium ear rots.

Many products have specific use restrictions about the amount of active ingredient that can be applied within a period of time or the amount of sequential applications that can occur. Read and follow all use restrictions prior to applying any fungicide.

Efficacy categories: NR=Not Recommended; P=Poor; F=Fair; G=Good; VG=Very Good; E=Excellent; NL=Not Labeled for use against this disease; U=Unknown efficacy or insufficient data to rank product

2Corn Disease Management

Fungicide Efficacy for Control of Corn DiseasesFu

ngic

ide

Effic

acy

for C

ontr

ol o

f Cor

n D

isea

ses1

FUNG

ICID

E(S)

Anth

racn

ose

Leaf

Blig

htCo

mm

on R

ust

Eyes

pot

Gray

Leaf

Spot

North

ern

Corn

Le

af B

light

Sout

hern

Rus

t Ta

r Spo

t1 Ha

rves

t Re

stric

tion2

Clas

sAc

tive i

ngre

dien

t (%

)Tr

ade N

ame

Rate

/A

(fl. o

z.)

QoI S

trobil

urins

Gr

oup 1

1

azox

ystro

bin 22

.9%Qu

adris

2.08

SC®

mult

iple g

eneri

cs6.0

-15.5

VGE

VGE

GVG

NL7 d

ays

pyrac

lostro

bin 23

.6%He

adlin

e 2.09

EC/S

C®6.0

-12.0

VGE

EE

VGVG

NL7 d

ays

picox

ystro

bin 22

.5%Ap

roac

h 2.08

SC®

3.0-1

2.0VG

VG-E

VGF-

VGVG

GNL

7 day

s

DMI Tr

iazole

s Gr

oup 3

prop

icona

zole

41.8%

Tilt 3

.6EC®

m

ultipl

e gen

erics

2.0-4

.0NL

VGE

GG

FNL

30 da

ys

prot

hioco

nazo

le 41

.0%Pr

oline

480S

C®5.7

UVG

EU

VGG

NL14

days

tebuc

onaz

ole 38

.7%Fo

licur

3.6F®

mult

iple g

eneri

cs4.0

-6.0

NLU

NLU

VGF

NL36

days

tetrac

onaz

ole 20

.5%Do

mark

230M

E®4.0

-6.0

UU

UE

VGG

NLR3

(milk

)

Mixe

d Mod

es

of Ac

tion

azox

ystro

bin 13

.5%

prop

icona

zole

11.7%

Quilt

Xcel

2.2SE®

mult

iple g

eneri

cs10

.5-14

.0VG

VG-E

VG-E

EVG

VGG-

VG30

days

benz

ovind

iflupy

r 2.9%

az

oxys

trobin

10.5%

pr

opico

nazo

le 11

.9%Tri

vapr

o 2.21

SE®

13.7

UU

UE

VGE

G-VG

30 da

ys

cypr

ocon

azole

7.17

%

picox

ystro

bin 17

.94%

Apro

ach P

rima 2

.34SC®

3.4-6

.8U

UU

EVG

GG-

VG30

days

flutri

afol 1

9.3 %

flu

oxas

trobin

14.84

%Fo

rtix 3

.22SC®

Pree

mpt

or 3.

22SC®

4.0 -6

.0U

UU

EVG

-EVG

NLR4

(dou

gh)

flutri

afol 2

6.47%

bixafe

n 15.5

5%Lu

cent

o3.0

-5.5

UU

UVG

-EVG

VGG-

VGR4

prot

hioco

nazo

le 16

.0%

triflo

xystr

obin

13.7%

Delar

o 325

SC®

8.0-1

2.0VG

EVG

EVG

VGG-

VG14

days

pydif

lumeto

fen 7

.0%

azox

ystro

bin 9

.3%

prop

icona

zole

11.6%

Mirav

is Ne

o 2.5S

E®13

.7U

UU

EVG

-EVG

G-VG

30 da

ys

pyrac

lostro

bin 28

.58%

flu

xapy

roxad

14.33

%Pr

iaxor

4.17

SC®

4.0-8

.0U

VGU

VGVG

-EVG

U21

days

pyrac

lostro

bin 13

.6%

metc

onaz

ole 5

.1%He

adlin

e AMP

1.68

SC®

10.0-

14.4

UE

EE

VGG

G-VG

20 da

ys

triflo

xystr

obin

32.3%

pr

othio

cona

zole

10.8%

Strate

go YL

D 4.18

SC ®

4.0-5

.0VG

EVG

EVG

GNL

14 da

ys

tetrac

onaz

ole 7

.48%

az

oxys

trobin

9.35

%Af

fianc

e 1.5S

C®10

.0-14

.0U

G-VG

UG-

VGG-

VGG

G7 d

ays

Flutri

afol 1

8.63%

Az

oxys

trobin

25.30

%To

pGua

rd EQ

5.0

-7.0

UF

UVG

GU

G-VG

45 da

ys

Mefen

triflu

cona

zole

17.56

a5

Pyrac

lostro

bin 17

.56%

Velty

ma

7.0-1

0.0U

UU

VG-E

VG-E

VGG-

VG21

days

Mefen

triflu

cona

zole

11.61

%

Pyrac

lostro

bin 15

.49%

Flu

xapy

roxad

7.74

%Re

vytek

8.0-1

5.0

UU

UVG

-EVG

-EVG

G-VG

21 da

ys

1 Fung

icid

e app

licat

ion

timin

g is

extr

emel

y im

port

ant a

nd n

eeds

to b

e mad

e nea

r the

ons

et o

f the

tar s

pot s

ympt

oms.

Effic

acy

ratin

gs b

ased

on

limite

d sit

e loc

atio

ns fr

om 2

018

and

2019

. A 2

ee la

bel i

s ava

ilabl

e for

seve

ral

fung

icid

es fo

r con

trol

of t

ar sp

ot, h

owev

er, e

ffica

cy d

ata a

re li

mite

d. C

heck

2ee

labe

ls ca

refu

lly, a

s not

all

prod

ucts

hav

e 2ee

labe

ls in

all

stat

es.

2 Har

vest

rest

rictio

ns ar

e list

ed fo

r fie

ld co

rn h

arve

sted

for g

rain

. Res

tric

tions

may

var

y fo

r oth

er ty

pes o

f cor

n (s

wee

t, se

ed, o

r pop

corn

, etc

.), an

d co

rn fo

r oth

er u

ses s

uch

as fo

rage

or f

odde

r.Th

is in

form

atio

n is

prov

ided

onl

y as

a gu

ide.

It is

the a

pplic

ator

’s le

gal r

espo

nsib

ility

to re

ad an

d fo

llow

all

curr

ent l

abel

dire

ctio

ns. R

efer

ence

in th

is pu

blic

atio

n to

any

spec

ific c

omm

erci

al p

rodu

ct is

for g

ener

al

info

rmat

ion

only,

and

does

not

cons

titut

e an

endo

rsem

ent o

r rec

omm

enda

tion

by th

e CD

WG

. Ind

ivid

uals

usin

g su

ch p

rodu

cts a

ssum

e res

pons

ibili

ty fo

r the

ir us

e in

acco

rdan

ce w

ith cu

rren

t dire

ctio

ns o

f the

m

anuf

actu

rer.

Mem

bers

or p

artic

ipan

ts in

the C

DW

G as

sum

e no

liabi

lity

resu

lting

from

the u

se o

f the

se p

rodu

cts.

3Corn Disease Management

Fungicide Efficacy for Control of Corn Diseases

Find Out MoreThe Crop Protection Network (CPN) is a multi-state and international collaboration of university and provincial extension specialists, and public and private professionals who provide unbiased, research-based information to farmers and agricultural personnel. Our goal is to communicate relevant information that will help professionals identify and manage field crop diseases.

Find more crop disease resources at CropProtectionNetwork.org.

This publication was developed by members of the Corn Disease Working Group. It was compiled and published by Kiersten Wise, University of Kentucky. Design and production by Purdue Agricultural Communication. Production and layout by Iowa State University Extension and Outreach Agriculture and Natural Resources.

The information in this publication is only a guide, and the authors assume no liability for practices implemented based on this information. Reference to products in this publication is not intended to be an endorsement to the exclusion of others that may be similar. Individuals using such products assume responsibility for their use in accordance with current directions of the manufacturer.

March 2020 The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual’s income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer.

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