
Table 14.4. Potato fungicides ordered by disease and then FRAC group according to their mode of action. (continued)
Pertinent Diseases
Fungicide
or Pathogens
Group1
Chemical
(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.
Pythium, Pink Rot, and
4 Ridomil Gold SL, Orondis Gold B SEE INDIVIDUAL
Phytophthora seed
LABELS
decays
2 At planting
Ultra Flourish
(mefenoxam)
4 MetaStar 2E AG 8 pt 2 See label for banding applications; for use
(metalaxyl) at planting
4 & M1 Ridomil Gold Copper 64.8W 2 lb 6 lb 14 2 Limit is 3 appl./crop of this product & other
Ridomil products Add protectant fungicide,
see label. Also for storage rots (Pythium
leak, Pink Rot)
(mefenoxam + copper hydroxide)
4 & M3 Ridomil Gold MZ 2.5 lb See label 3 2 Also labeled for storage rots (Pink Rot and
(mancozeb + mefenoxam) Leak)
4 & M5 Ridomil Gold Bravo SC 2.5 pt See label 14 2 Limit is 4 appl./crop. Also labeled for storage
(chlorothalonil + mefenoxam) rots (Pink Rot and Leak)
14 Botran 75W 6 lb 10 lb 20 0.5 Subsequent applications are made at 2 lb/A
(DCNA cicloran)
14 Terraclor F
oz 1000
linear ft
15 pt 45 0.5 At planting or see label for white mold
(PCNB)
21 Ranman 7 0.5 Alternate with non-group 11 chemistry
(cyazofamid) between applications
27 Curzate 60DF 3.2 oz 22.4 oz 14 0.5 Limit is 7 apps/year. Use in combination
with a protectant fungicide. It is best to
alternate Curzate with other fungicides such
as mancozeb or chlorothalonil. Also labeled
for seed treatment
(cymoxanil)
M5 & 49 Orondis Opti
(chlorothalonil + oxathiapiprolin)
2.5 pt 10 pt per A
per year
7 12 hr See label
33
Fungi-Phite, Phiticide, Phostrol, ProPhyt,
Rampart, Reveille, (mono- and dipotassium
salts of phosphorous acid)
See
individual
label
Rhizoctonia, Black
Scurf & Stem Canker
(Rhizoctonia solani)
M3 (mancozeb) SEE INDIVIDUAL
LABELS
3 1 See label for seed piece treatment.
Many brands available:
Dithane M45, Dithane DF Rainshield,
Dithane F45 Rainshield,Fortuna 75WDG,
Koverall, Mancozeb Flowable, Manzate
Pro-Stick, Nubark Mancozeb, Penncozeb
4FL, Penncozeb 80WP, Penncozeb 75DF,
Roper DF Rainshield
7 Moncut 70DF 1.1 lb 0.5 In-furrow use only
7 Vertisan 7 0.5 Do not make more than 2 sequential
(penthiopyrad) applications
7 & 3 Emesto Silver
oz/100 lb
seed pieces
12 hr See label for seed treatment details
7 & M3 Moncoat MZ 1.0 lb/100 lb
seed
1 Seed treatment
7 & 11 Elatus
5 oz/1000
linear feet
14 In-furrow use only
11 Azoxystrobin 100ST, Azoyzone, Dynasty see label 4 hr Seed treatment
(azoxystrobin)
11 Headline
1000
linear ft
0.5 In-furrow use only
(pyraclostrobin)
12 Dyna-Shield, Maxim, Spirato
lb seed
0.5 Seed treatment
12 + M3 Maxim MZ 0.5 lb/100 lb
seed
1 Seed treatment
272 2019 Vegetable Production Handbook of Florida