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) 21 Actigard 50WG
(acibenzolar-S-methyl)
1 oz. 4 oz 7 0.5 Do not apply to plants that are stressed or prior
or within 5 days transplanting. Suppression
only
(Suppression only) 27 & 11 Tanos 8 oz 84 oz 3 0.5 See label
(cymoxanil + famoxadone)
Black mold 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 application
(Aspergillus niger)
Botrytis leaf blight M3 (mancozeb) SEE INDIVIDUAL
LABEL
7 1 Do not apply to exposed bulbs
(Botrytis squamosa) Many brands available:
Dithane DF, Dithane F45, Dithane M45,
Koverall, Manzate, Manzate Pro-Stik,
Penncozeb 4FL, Penncozeb 75DF,
Penncozeb 80WP, Roper DF
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
M1 & M3 Mankocide 2.25 lbs 160 lb
(per crop)
7 2 Do not apply to exposed bulbs.
(copper hydroxide + mancozeb)
2 (iprodione) SEE INDIVIDUAL
LABEL
7 1
Many brands available:
Enclosure 4, Iprodione 4L AG, Meteor,
Nevado 4F, Rovral 4 Flowable
(Suppression only) 3 (propiconazole) SEE INDIVIDUAL
LABEL
See label 0.5
Many brands available:
Amtide proiconazole 41.8% EC,
Bumper 41.8 EC, Bumper ES, Fitness,
Propicure, Propimax EC, Propistar EC,
Shar-Shield PPZ, Tide Propiconazole
EC, Tilt
3 & 7 Luna Experience
7 0.5 Alternate with fungicides of dissimilar modes
of action.
14 Botran 5F 2 to 3 1/5
lbs
See label 14 See label See label
(DCNA dicloran)
4 & M5 Ridomil Gold Bravo SC, See label 7 (dry
bulb);
14/21
(green)
2
(mefenoxam + chlorothalonil)
7 Endura 6.8 oz 41 oz 7 0.5 Alternate applications with a different fungicide
(boscalid) group.
7 Fontelis 3 0.5 See label
(penthiopyrad)
7 & 9 Luna Tranquility
7 0.5 Do not make more than 2 applications per
year.
7 & 11
pyraclostrobin)
7 0.5 Alternate with fungicides of dissimilar modes
of action.
9 Vangard WG 10 oz 28 oz 7 0.5 Do not make more than 2 consecutive
(cyprodinil) applications.
9 Scala SC 7 0.5 Do not make more than 2 consecutive
(pyrimethanil) applications.
11 Quadris See label See label 4 hr Alternate applications with a different fungicide
(azoxystrobin) group.
214 2019 Vegetable Production Handbook of Florida