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.
12 Maxim 4FS
oz/100 lbs
seed
- - 0.5
Spirato 480 FS
11 Dynasty
oz/100 lb
seed
See label See label 4 hr
(azoxystrobin)
14 Botran 5F 3.5 lbs See label 14 See label
(DCNA dicloran)
Stemphylium Blight 2 (iprodione) SEE INDIVIDUAL
LABEL
7 1
(Stemphylium vesicarium) Many brands available:
Enclosure 4, Iprodione 4L AG, Meteor,
Nevado 4F, Rovral 4 Flowable
7 Fontelis 3 0.5
(penthiopyrad)
9 & 3 Inspire Super See label 14
(green);
7 (dry
bulb)
0.5 Do not make more than 2 applications before
(cyprodinil + difenoconazole) alternate with a different fungicide group
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 for action
(azoxystrobin + difenoconazole)
11 & 7 Pristine 18.5 oz 111 oz 7 0.5 Do not make more than 2 consecutive
(pyraclostrobin + boscalid) applications. No more than 6 appl/ crop.
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 1 pt 6 pt 7 1
on 7-14 day schedule.
White rot 1 (thiophanate-methyl) SEE INDIVIDUAL
LABEL
3
(Sclerotium cepivorum) Many brands available:
Incognito 4.5 F, NuFarm T-Methyl
4.5 F, NuFarm T-Methyl 70 WSB,
Thiophanate-methyl 85 WDG, Topsin
4.5 FL, Topsin M 70 WP, Topsin M 70
WDG, Topsin M WSB
3 (tebuconazole) SEE INDIVIDUAL
LABEL
7 0.5
Many brands available:
Onset 3.6L, Orius 3.6 F, Tebu-Crop 3.6F,
Tebustar 3.6 L, Tebuzol 3.6F, Toledo
7 Fontelis (penthiopyrad) 7 0.5 Spray into empty furrow at time of planting.
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)
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.
12 Cannonball WG 7 oz 32 oz 7 0.5
12 Maxim 4FS
100 lbs
seed
- - 0.5
14 Botran 5F 3.5 lbs See label 14 0.5
(DCNA dicloran)
1 FRAC code (fungicide group): Number (1 through 45) and letters (U and P) are used to distinguish the fungicide mode of action groups. All fungicides within the same
group (with same number or letter) indicate same active ingredient or similar mode of action. This information must be considered for the fungicide resistance management
FRAC Code List 2019; http://www.frac.info/ (FRAC = Fungicide Resistance Action Committee).
2 Information provided in this table applies only to Florida. Be sure to read a current product label before applying any chemical. The use of brand names and any mention or
listing of commercial products or services in the publication does not imply endorsement by UF/IFAS Extension nor discrimination against similar products or services not
mentioned.
2019 Vegetable Production Handbook of Florida 221
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