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.
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M1 & M2 Top cop with sulfur 2-3 qts See label 0 1 Do not use during hot weather or within 4
(basic copper sulfate + sulfur) weeks of an oil application.
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
M1 & M3 Mankocide 2.25 lbs 160 lb
(per crop)
7 2 Do not apply to exposed bulbs.
(copper hydroxide + mancozeb)
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.
U15 & 40 Orondis Ultra
(oxathiapiprolin + mandipropamid)
������������ ����������������
(dry);
����������������
(green)
7 4 hr Do not make more than 2 sequential
applications and do not exceed more than 33%
of all fungicide applications with Orondis.
4 & M1 Ridomil Gold/Copper 2 lbs 7 (green);
(mefenoxam + copper hydroxide) mefenoxam
10 (dry
bulb)
2 Maximum 0.4 lbs/A a.i. of metalaxyl or
4 & M3 Ridomil Gold MZ WG 2.5 lbs 7 (dry
bulb)
2
(mefenoxam + mancozeb)
4 & M5 Ridomil Gold Bravo SC See label 7 (dry
bulb);
14/21
(green)
2
(mefenoxam + chlorothalonil)
11 Quadris, See label ������������������ See label 4 hr Alternate applications with a different fungicide
(azoxystrobin) group.
11 Reason 500SC ���������������� �������������� 7 0.5 Alternate applications with a different fungicide
(fenamidone) group.
11 Cabrio EG 12 oz 72 oz 7 0.5 Alternate applications with a different fungicide
(pyraclostrobin) group. Make no more than 5 appl/crop.
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
(Suppression only) 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
(Suppression only) 21 Actigard 50WG 1 oz. 4 oz 7 0.5 Do not apply to plants that are stressed or prior
(acibenzolar-S-methyl) or within 5 days transplanting.
21 Ranman
(cyazofamid)
������������ ������������������ 0 0.5 Alternate with fungicides of dissimilar modes
of action. Do not make more than 3 sequential
applications.
22 & M5 Zing
(zoxamide + chlorothanil)
�������������� 7.5 qt 7 0.5 Do not make more than 8 applications per
year.
27 & 11 Tanos 8 oz 84 oz 3 0.5
(cymoxanil + famoxadone)
29 Omega 500F 1 pt 6 pt 7 2
��������������������
33 Aliette WDG, 3 lb 7 appl. See label See label Do not tank mix with copper fungicides,
Linebacker WDG adjuvants or foliar fertilizers
(fosetyl-Al)
33 (mono- and di-potassium salts SEE INDIVIDUAL
LABEL
0 4 hr See label for details.
of phosphorous acid)
2019 Vegetable Production Handbook of Florida 217