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.
14 Blocker 10G, Blocker 4F, Terraclor 75WP See label At planting
(PCNB)
14 Terraclor F
oz 1000
linear ft
15 pt 45 0.5 At planting or see label for white mold
(PCNB)
27, M3
& 1
Evolve 0.75 lb/100
lb cut seedpieces
1 Potato seed piece treatment
(cymoxanil + mancozeb + thiophanatemethyl)
Soft rot 25 Agri-Mycin 17, 100 ppm 0.5 Seed treatment. Check individual labels for
Harbour
(streptomycin)
Soilborne pathogens
pathogens)
M2 (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
11 Dynasty
oz/100 lb
seed
4 hr For suppression of black scurf and stem
canker and seed-borne black dot and for
protection against silver scurf
(azoxystrobin)
12 Maxim 4FS; Spirato 0.16 oz/100
lb seed
0.5 Seed treatment. Must be made using
12 Maxim Potato Seed Protectant 0.5 lb/100 lb
seed
0.5 Seed treatment
Maxim PSP
12 & M3 Maxim MZ 0.5 lb/100 lb
seed
1 Seed treatment
White mold 1 Cercoban SEE INDIVIDUAL
LABELS
21 2
(Sclerotinia
sclerotiorum)
Topsin M WSB
T-Methyl
Thiophanate Methyl
Incognito 4.5F
(thiophanate-methyl)
2 Enclosure 4, Iprodione 4L, see label see label 14 1 Limit is 4 appl./crop. See individual label for
Meteor, Nevado 4F, Meteor, Nevado 4F, additional information.
Rovral 4F
Rovral 4F
(iprodione)
3 Quash
(metconazole)
4.0 oz 7.5 oz 1 12 hr Follow resistance management
recommendations on label
(suppression) 7 Endura 70WP 10 oz 20 oz 10 0.5 Do not make more than 4 apps at low rate or
(boscalid) 2 apps at high rate
7 Vertisan 7 0.5 Do not make more than 2 sequential
(penthiopyrad) applications
7 Velum Prime
See label
for ground
or aerial
application
rates
See label
for ground
or aerial
application
rates
7 12 hr Do not make more than 2 sequential
applications
(suppression) 7 & 9 Luna Tranquility 43.6 7 0.5 Do not make more than 2 sequential
applications
(suppression) 7 & 11 Priaxor 24 7 0.5 Do not make more than 2 sequential
applications
11 Headline
(pyraclostrobin)
3 0.5 Alternate with non-group 11 chemistry
between applications.
2019 Vegetable Production Handbook of Florida 273