Southeastern U.S. Vegetable Crop Handbook - 2023 - 240

DISEASE CONTROL
TABLE 3-22. DISEASE CONTROL PRODUCTS FOR ONION (CONT'D)
N. Gauthier, Plant Pathologist, University of Kentucky; B. Dutta, Plant Pathologist, University of Georgia
Minimum Days
Disease/Material
FRAC
Code
ONION (GREEN) (cont'd)
LEAF BLIGHT (BOTRYTIS SPP.) (cont'd)
cyprodinil + fludioxonil
(Switch)
9+12
difenoconazole + cyprodinil
(Inspire Super)
fluopyram + pyrimethanil
(Luna Tranquility)
fluopyram + tebuconazole
(Luna Experience)
fluxapyroxad + pyraclostrobin
(Merivon)
penthiopyrad
(Fontelis)
propiconazole
(Quilt )
pyraclostrobin
(Cabrio)
pyraclostrobin + boscalid
(Pristine)
pyrimethanil
(Scala)
3+9
7+9
7+3
7+11
7
3
11
11+7
9
PURPLE BLOTCH (ALTERNARIA PORRI)
azoxystrobin
(Quadris)
11
azoxystrobin + difenoconazole
(Quadris Top)
azoxystrobin + chlorothalonil
(Quadris Opti)
azoxystrobin + propiconazole
(Quilt Xcel)
azoxystrobin + tebuconazole
(Custodia)
boscalid
(Endura) 70WG
chlorothalonil
(various)
chlorothalonil + cymoxanil
(Ariston)
chlorothalonil + tebuconazole
(Muscle ADV)
cyprodinil
(Vangard WG)
cyprodinil + fludioxonil
(Switch)
difenoconazole +
benzovindiflupyr
(Aprovia Top)
difenoconazole + cyprodinil
(Inspire Super)
fluopyram + pyrimethanil
(Luna Tranquility)
M
See labels
M+27 2.0 to 2.4 pt/acre
M+3
9
9+12
3+7
3+9
7+9
1.1 to 1.6 pt/acre
10 oz/acre
11 to 14 oz/acre
10.5 oz/acre
16 to 20 fl oz/acre
16 to 27 fl oz/acre
14
14
7
7
7
7
14
7
2
0.5
0.5
0.5
0.5
0.5
0.5
0.5
11+3
Rate of Material
Formulation
Harv. Reentry Method, Schedule, and Remarks
11 to 14 oz/acre
16 to 20 fl oz/acre
16 to 27 fl oz/acre
8.0 to
12.8 fl. oz/acre
4 to 11 fl oz/acre
16 to 24 fl oz/acre
14 to 27.5 oz/acre
8 to 12 oz/acre
14.5 to
18.5 oz/acre
9 or 18 fl oz/acre
7
0.5
Resistance reported in the Southeast. 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.
6 to 12 fl oz/acre
4 hr Make no more than two sequential applications before alternating with fungicides
that have a different mode of action. Apply no more 90 fl oz Quadris per
crop per acre per season. See individual labels for application instructions
and rates
12 to 14 oz/acre
11+M 1.6 to 3.2 pt/acre
11+3
11+3
7
14 to 21 fl oz
8.6 to 12.9 fl oz
6.8 oz/acre
7
14
7
7
0.5
0.5
0.5
0.5
0.5
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.
Apply in a protective schedule or when weather is favorable for disease.
Do not make more than 2 sequential applications before alternating to 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.
When disease pressure is high, use higher rates and shorter intervals.
7
14
7
7
7
3
7
7
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
1
Do not plant rotational crops other than onions or strawberries for 12 months
following the last application.
Make no more than two applications before alternating with a fungicide with a
different mode of action.
When disease pressure is high, use higher rates and shorter intervals.
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.
Begin sprays prior to disease development and continue on a 7- to 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.
240
2023 Vegetable Crop Handbook for Southeastern United States
Southeastern U.S. Vegetable Crop Handbook - 2023

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