Southeastern U.S. Vegetable Crop Handbook - 2021 - 238

TABLE 3-22. DISEASE CONTROL PRODUCTS FOR ONION (cont'd)
E. Pfeufer, Plant Pathologist, University of Kentucky; B. Dutta, Plant Pathologist, University of Georgia
Minimum Days
Disease
ONION (green) (cont'd)
Leaf blight
(Botrytis spp.)
(cont'd)
Material
pyraclostrobin
(Cabrio)
pyraclostrobin + boscalid
(Pristine)
pyrimethanil
(Scala)
Purple blotch
(Alternaria porri)
azoxystrobin + difenoconazole
(Quadris
Top)
azoxystrobin + chlorothalonil
(Quadris Opti)
azoxystrobin + propiconazole
(various)
azoxystrobin + tebuconazole
(various)
boscalid
(Endura) 70WG
chlorothalonil (various)
chlorothalonil + cymoxanil
(Ariston)
cyprodinil + fludioxonil
(Switch)
difenoconazole + benzovindiflupyr
(Aprovia
Top)
difenoconazole + cyprodinil
(Inspire Super)
fenamidone
(Reason)
fixed copper (various)
fluopyram + tebuconazole
(Luna Experience)
fluxapyroxad + pyraclostrobin
(Merivon)
mefenoxam + chlorothalonil
(Ridomil Gold/Bravo)
penthiopyrad
(Fontelis)
propiconazole (various)
pyraclostrobin
(Cabrio)
pyraclostrobin + boscalid
(Pristine)
pyrimethanil
(Scala)
Stemphylium leaf blight
(Stemphylium
vesicarium)
azoxystrobin + difenoconazole
(Quadris Top)
azoxystrobin + propiconazole
(various)
fluopyram + pyrimethanil
(Luna Tranquility)
difenoconazole + cyprodinil
(Inspire Super)
fluxapyroxad + pyraclostrobin
(Merivon)
pyraclostrobin + boscalid
(Pristine)
M
M+27
9+12
3+7
3+9
11
See labels
2.0 to 2.4 pt/acre
11 to 14 oz/acre
10.5 oz/acre
16 to 20 fl oz/acre
5.5 to 8.2 fl oz
14
14
7
7
14
7
2
0.5
0.5
0.5
0.5
0.5
FRAC
Code
11
Rate of Material
Formulation
8 to 12 oz/acre
11+7 14.5 to 18.5 oz/acre
9
11+3
11+M
11+3
11+3
7
9 or 18 fl oz/acre
12 to 14 oz/acre
1.6 to 3.2 pt/acre
14 to 26 fl oz
8.6 to 12.9 fl oz
6.8 oz/acre
Harv. Reentry Method, Schedule, and Remarks
7
7
7
7
14
7
7
0.5
1
0.5
0.5
0.5
0.5
0.5
0.5
Make no more than 2 sequential applications and no more
than 6 applications per season.
Make a maximum of 6 applications per season.
Use lower rate in a tank mix with broad-spectrum fungicide
and higher rate when applied alone. Do not apply more
than 54 fl oz per crop.
Make no more than one application before alternating
with a fungicide with a different mode of action.
Make no more than one application before alternating
with a fungicide with a different mode of action.
Make only one application before rotating to a non-group
11 fungicide.
Use higher rate and shorter interval when disease
conditions are severe.
Do not make more than 2 sequential applications or more
than 6 applications per season.
Spray at first appearance. Maximum of three sprays.
Apply prior to favorable infection periods; continue on 7 to 9
day interval; alternate with a different mode of action.
Do not plant rotational crops other than onions or strawberries
for 12 months following the last application.
Also for Stemphylium leaf blight. Use preventatively
with a penetrating spreader.
Make no more than two applications before alternating
with a fungicide with a different mode of action.
Begin applications when conditions favor disease development,
and continue on 5 to 10 day interval. Do not apply
more than 22 fl oz per growing season. Alternate with
fungicide from different resistance management group.
M
7+11
4+M
7
3
11
See labels
7+3 8.0 to 12.8 fl. oz/acre
4 to 11 fl oz/acre
2.5 lb/acre
16 to 24 fl oz/acre
4 to 8 fl oz
8 to 12 oz/acre
11+7 10.5 to 18.5 oz/acre
9
11+3
11+3
7 + 9
3+9
7+11
9 or 18 fl oz/acre
12 to 14 oz/acre
14 to 26 fl oz
16 to 27 oz/acre
16 to 20 fl oz/acre
4 to 11 fl oz/acre
11+7 10.5 to 18.5 oz/acre
1
7
7
14
3
7
7
7
7
7
14
7
7
1
0.5
0.5
2
0.5
0.5
0.5
1
0.5
0.5
0.5
0.5
0.5
0.5
1
Begin sprays prior to disease development and continue on
a 7-14 day schedule.
Alternate with a different mode of action.
Make no more than 2 sequential applications and no more
than 6 applications per season.
Make a maximum of 6 applications per season.
Use lower rate in a tank mix with broad-spectrum fungicide
and higher rate when applied alone. Do not apply more than
54 fl oz per crop.
Make no more than one application before alternating with a
fungicide with a different mode of action.
Make only one application before rotating to a non-group 11
fungicide.
See label
Make no more than two applications before alternating with
a fungicide with a different mode of action.
Apply at disease onset; continue on 7 to 14 day schedule.
No more than 3 applications/season.
Make no more than 6 applications per season.
May also reduce bacterial rots.
Observe seasonal application limits for both group 7 and
group 3 fungicides.
Apply at disease onset; continue on 7 to 14 day schedule.
No more than 3 applications/season.
238
2021 Vegetable Crop Handbook for Southeastern United States
DISEASE CONTROL
Southeastern U.S. Vegetable Crop Handbook - 2021

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