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.
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