Southeastern U.S. Vegetable Crop Handbook - 2023 - 241

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
Rate of Material
Formulation
ONION (GREEN) (cont'd)
PURPLE BLOTCH (ALTERNARIA PORRI) (cont'd)
fluopyram + tebuconazole
(Luna Experience)
7+3
fluxapyroxad + pyraclostrobin
(Merivon)
mefenoxam + chlorothalonil
(Ridomil Gold/Bravo)
penthiopyrad
(Fontelis)
potassium phosphite +
tebuconazole
(Viathon)
propiconazole
(Quilt)
pyraclostrobin
(Cabrio)
pyraclostrobin + boscalid
(Pristine)
pyrimethanil
(Scala)
3
11
11+7
9
14 to 27.5 fl oz
8 to 12 oz/acre
10.5 to
18.5 oz/acre
9 or 18 fl oz/acre
STEMPHYLIUM LEAF BLIGHT (STEMPHYLIUM VESICARIUM)
azoxystrobin
(Quadris)
11
6 to 12 fl oz/acre
azoxystrobin + difenoconazole
(Quadris Top)
azoxystrobin + propiconazole
(Quilt Xcel)
fluopyram + pyrimethanil
(Luna Tranquility)
difenoconazole + cyprodinil
(Inspire Super)
fluopyram + pyrimethanil
(Luna Tranquility)
fluxapyroxad + pyraclostrobin
(Merivon)
pyraclostrobin + boscalid
(Pristine)
ONION (DRY)
DAMPING OFF (PYTHIUM SPP.)
mefenoxam
(Ridomil Gold)
metalaxyl
(MetaStar)
azoxystrobin + mefenoxam
(Uniform)
11+3
11+3
12 to 14 oz/acre
14 to 26 fl oz
7 + 9 16 to 27 oz/acre
3+9
7+9
7+11
11+7
16 to 20 fl oz/acre
16 to 27 fl oz/acre
4 to 11 fl oz/acre
10.5 to
18.5 oz/acre
7
0.5
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.
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.
7
7
14
7
7
7
0.5
0.5
0.5
0.5
0.5
0.5
1
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.
When disease pressure is high, use higher rates and shorter intervals.
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.
7
7
0.5
0.5
1
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.
7+11
4+M
7
49+3
Harv. Reentry Method, Schedule, and Remarks
8.0 to
7
12.8 fl. oz/ acre
4 to 11 fl oz/acre
2.5 lb/acre
16 to 24 fl oz/acre
2 to 3 pt/acre
7
14
3
7
0.5
0.5
2
0.5
0.5
Begin sprays prior to disease development and continue on a 7- to 14-day
schedule.
Use as a preventative treatment.
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.
4
4
11+4
0.5 to 1 pt/trt acre -
2 to 4 pt/trt acre -
0.34 fl oz /1000 ft -
DOWNY MILDEW (PERONOSPORA DESTRUCTOR)
ametoctradin + dimethomorph
(Zampro)
45+40
chlorothalonil + cymoxanil
(Ariston)
chlorothalonil + zoxamide
(Zing!)
2
2
See label for row rates. Also, for green onion.
Preplant incorporated or soil surface spray.
In-furrow treatment.
14.0 fl oz/acre
M+27 1.6 to 2.4 pt/acre
M+22
30 fl oz
7
7
0.5
0.5
0.5
Begin applications prior to disease development and continue on a 5- to
7-day spray interval.
Apply prior to favorable infection periods; continue on a 7- to 9-day interval;
alternate with a different mode of action.
Do not apply to exposed bulbs.
2023 Vegetable Crop Handbook for Southeastern United States
241
Southeastern U.S. Vegetable Crop Handbook - 2023

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