Southeastern U.S. Vegetable Crop Handbook - 2023 - 204

DISEASE CONTROL
TABLE 3-6. DISEASE CONTROL PRODUCTS FOR BROCCOLI, BRUSSEL SPROUT, CABBAGE, AND CAULIFLOWER
(HEAD AND STEM BRASSICAS) (CONT'D)
A. Keinath, Plant Pathologist, Clemson University
Disease/Material
FRAC
Code
21
CLUBROOT (PLASMODIOPHORA BRASSICAE)
cyazofamid
(Ranman 34.5SC)
Rate of Material
Formulation
Transplant:
12.9 to 25.75 fl oz/
100-gal water
Banded:
20 fl oz/acre
fluazinam
(Omega 500F)
29
Transplant:
6.45 fl oz/100-gal
water
Banded:
2.6 pts/acre
DOWNY MILDEW (HYALOPERONOSPORA PARASITICA)
ametoctradin + dimethomorph
(Zampro 525SC)
40+45
cyazofamid
(Ranman 400SC)
21
14 fl oz/acre
2.75 fl oz/acre
50
50
0.5
0.5
Do not make more than 2 sequential applications before alternating to a
fungicide with a different mode of action. Addition of an adjuvant may improve
performance (see label for specifics).
Begin applications on a 7- to 10-day schedule when disease first appears, or
weather is conducive. Do not apply more than 39.5 fl oz/acre/season; or 6 (1
soil + 5 foliar) applications per season. Do not make more than 3 consecutive
applications without rotating to another fungicide with a different mode of
action for 3 subsequent applications.
dimethomorph
(Forum 4.16SC)
fenamidone
(Reason 500SC)
fluopicolide
(Presidio 4 SC)
fosetyl-AL
(Aliette)
mandipropamid
(Revus 2.08SC)
oxathiapiprolin + mandipropamid
(Orondis Ultra A + Orondis Ultra
B2.33SC)
potassium phosphite
(various)
40
11
6 oz/acre
5.5 to 8.2 oz/acre
2
0.5
0.5
Alternate every application with a non-FRAC Group 40 fungicide. Limit of 3
applications per season.
Begin applications as soon as conditions become favorable for disease
development. Applications should be made on a 5- to 10-day interval. Do not
make more than one application of Reason 500SC before alternating with a
fungicide from a different resistance management group.
43
3 to 4 fl oz/acre
2
0.5
Must be tank mixed with another fungicide with a different mode of action.
No more than 2 sequential applications before rotating to another effective
product of a different mode of action. Limited to 4 applications 12 fl oz/acre
per season.
33
40
2 to 5 lb/acre
8 fl oz/acre
U15+40 5.5 to 8 fl oz/acre
3
1
1
0.5
Apply when disease first appears; then repeat on 7- to 21-day intervals. Do
not tank mix with copper fungicides. A maximum of 7 applications can be
made per season.
Apply prior to disease development and continue throughout season at 7- to
10-day intervals; maximum 32 fl oz per season.
4 hr Apply prior to disease development at 10-day intervals. Make no more than 2
sequential applications before alternating with fungicides that have a different
mode of action. Maximum of 4 applications per crop per year of all Orondis
products.
33
DOWNY MILDEW, ALTERNARIA LEAF SPOT
azoxystrobin
(Quadris 2.08F)
11
chlorothalonil
(various)
fenamidone
(Reason 500SC)
fluazinam
(Omega 500 F)
mancozeb
(various)
mefenoxam + chlorothalonil
(Ridomil Gold/ Bravo)
M3
4+M5
1.6 to 2.1 lb/acre
1.5 lb/acre
10
7
1
2
M5
11
2 to 4 pt/acre
4 hr Apply when weather is foggy as a preventative. Do not apply to plants under
water or temperature stress. Spray solution should have a pH greater than
5.5. Apply in at least 30-gal water per acre.
6.0 to 15.5 fl oz/
acre
See labels
5.5 to 8.2 fl oz/acre
7
2
4 hr Do not make more than 2 applications before alternating to a fungicide with
a different mode of action. Do not apply more than 92.3 fl oz per acre per
season.
2
0.5
Apply after transplanting, seedling emergence, or when conditions favor
disease development. Repeat as needed on a 7- to 10-day interval.
Begin applications on a 5- to 10-day schedule when disease first appears,
or weather is conducive. Do not apply more than 24.6 fl oz/acre/season. Do
not make more than 1 application without rotating to another fungicide with a
different mode of action.
29
15.35 fl oz/acre
7
0.5
Apply to cabbage only. DO NOT apply more than 5.75 pints (6 applications)
per acre per year.
Spray at first appearance of disease and continue on a 7- to 10-day interval.
No more than 12.8 lbs/acre per season.
Begin applications when conditions favor disease but prior to symptoms.
Under severe diseases pressure use additional fungicides between 14-day
intervals. Do not make more than four applications per crop.
0.5
Minimum Days
Harv. Reentry Method, Schedule, and Remarks
Either apply immediately after transplanting with 1.7 fl oz of solution per
transplant, or as a banded application with soil incorporation of 6 to 8 inches
prior to transplanting. Do not apply more than 39.5 fl oz/acre/season or 6 (1
soil+ 5 foliar) applications per season. Do not make more than 3 consecutive
applications without rotating to another fungicide with a different mode of
action for 3 subsequent applications.
Apply either directly as a drench to transplants or as a banded application
with soil incorporation of 6 to 8 inches prior to transplanting. Use of product
can delay harvest and cause some stunting without adverse effects on final
yields.
204
2023 Vegetable Crop Handbook for Southeastern United States
Southeastern U.S. Vegetable Crop Handbook - 2023

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