Table 12.6. Onion fungicides ordered by disease and then FRAC group according to their mode of action. (continued)
Pertinent Diseases
Fungicide
Chemical
or Pathogens
Group1
(active ingredients)
Max. Rate/Acre Min. Days to
Applic. Season Harvest Reentry Remarks2
Labels change frequently. Be sure to read a current product label before applying any chemical.
(Suppression only) 9 & 12 Switch 62.5WG 14 oz 56 oz 7 0.5 Do not make more than 2 consecutive appl.
Do not plant crops not on the label for 30 days
after last appl.
29 Omega 500F 1 pt 6 pt 7 2
U15 & M5 Orondis Opti
(oxathiapiprolin + chlorothalonil)
2.5 pt 10 pt 7 0.5 Do not make more than 2 sequential
applications and do not exceed more than 33%
of all fungicide applications with Orondis.
Cercospora leaf spot 11 & 3 Quadris Top 7 0.5 Make no more than 1 application before
alternating to another fungicide with a non-QoI
(Group 11) mode of action
(Cercospora duddiae) (azoxystrobin + difenoconazole)
Cladosporium leaf
blotch
11 Quadris, See label See label 4 hr Alternate applications with a different fungicide
group.
(Cladosporium allii) (azoxystrobin)
11 & M5 Quadris Opti 3.7 pt See label 14 0.5 Alternate applications with different fungicide
groups. Make no more than 3 applications/
crop. Do not tank mix with COC, MSO, or
silicon adjuvant.
(azoxystrobin + chlorothalonil)
11 & 3 Quilt Xcel
oz (green)
14 (dry
bulb); 0
(green)
0.5 Make only 1 appl. before alternating to a non(
azoxystrobin + propiconazole) group 11 fungicide
11 & 3 Quadris Top 7 0.5 Make no more than 1 application before
alternating to another fungicide with a non-QoI
(Group 11) mode of faction
(azoxystrobin + difenoconazole)
9 & 3 Inspire Super See label 14
(green);
7 (dry
bulb)
0.5 Do not make more than 2 applications before
(cyprodinil + difenoconazole) alternating with a different fungicide group
Damping-off M3 (mancozeb) SEE INDIVIDUAL
LABEL
7 1 Do not apply to exposed bulbs
Many brands available:
Dithane DF, Dithane F45, Dithane M45,
Koverall, Manzate, Manzate Pro-Stik,
Penncozeb 4FL, Penncozeb 75DF,
Penncozeb 80WP
2 (iprodione) SEE INDIVIDUAL
LABEL
7 1
Many brands available:
Enclosure 4, Iprodione 4L AG, Meteor,
Nevado 4F, Rovral 4 Flowable
12 Cannonball WG 7 oz 32 oz 7 0.5
12 Maxim 4FS
oz/100 lbs
seed
Seed treatment only.
Downy mildew M1 (copper compounds) SEE INIDIVIDUAL
LABEL
0 Varies
(Peronospora destructor) Many brands available: foliar burn
from 4
hr to 2
days.
Frequent use of copper fungicides may cause
Badge SC, Badge X2, Basic Copper
53, C-O-C-S WDG, Champ DP, Champ
F2 FL, Champ WG, C-O-C DF, C-O-C
40D, Cueva, Kentan DF, Kocide 3000,
Kocide 2000, Kocide DF, Nordox,
Nordox 75WP, Nu Cop 3L, Nu Cop
50DF, Nu Cop HB
(Suppression only) M5 (chlorothalonil) SEE INDIVIDUAL
LABEL
7 (dry
bulb); 14
(green)
1
Many brands available:
Bravo Ultrex, Bravo Weather Stik,
Bravo Zn, Chloronil 720, Chlorothalonil
720 EC, Echo 720, Echo 90 DF, Echo
Zn, Equus 500 Zn, Equus 720 SST,
Equus DF, Initiate 720, Initiate Zn
216 2019 Vegetable Production Handbook of Florida