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Potato - Diseases
Pesticide
copper products (copper hydroxide, copper octanoate,
copper oxychloride, copper sulfate, copper diammonium
diacetate complex, cuprous oxide) | Several formulations of
copper (Badge, Champ, Kocide) products are labelled for use
and may slow the spread of bacterial blight. See label for
directions. REI: 4 to 48-hour. PHI: 0-day. FRAC M01.
OMRI-listed.
Double Nickel 55 (25WDG) (Bacillus amyloliquefaciens
strain D-747) | 0.125-1 lbs. per acre as a soil drench or 0.253
lbs. per acre as a foliar application, according to disease
management considerations. REI: 4-hour. PHI: 0-day. FRAC
44. OMRI-listed.
streptomycin products (Streptomycin sulfate) | Use 17%
products at 8 oz. per 100 gals of water, or 50% products at
2.7 oz. per 100 gals. of water to maintain a concentration of
100 ppm. Soak seed pieces in solution for several minutes.
REI: 12-hour. FRAC 25.
Black Scurf of Potatoes - Rhizoctonia
Fungus
Use a fungicide when appropriate.
Non-Pesticide
Plant seed pieces certified to be free of disease. Harvest
potatoes as soon after maturity as possible. Rotation to a nonhost
crop 2-3 years.
Pesticide
azoxystrobin products (azoxystrobin) | Use 2 lb. a.i. per
gallon formulations (Quadris) at 0.4-0.8 fl. oz. per 1,000 row
feet. Use 3.3 lb. per gallon formulations (Azteroid) at 0.240.48
fl. oz. per 1,000 row feet. Use 0.83 lb. per gallon
formulations (Dynasty) for seed treatment at 0.10-3.75 fl. oz.
per 100 lbs. of seed. REI: 4-hour. FRAC 11.
Moncut (3.8) (flutolanil) | 0.7-1.1 lbs. per acre of the DF
formulation or 16-25 fl. oz. per acre of the SC formulation.
REI: 12-hour. FRAC 07.
Dry Rot of Potatoes - Fusarium Fungus
Avoid bruising at harvest. Cure potatoes in storage at 60
degrees F before lowering temperature. Provide adequate
ventilation.
Non-Pesticide
Avoid bruising at harvest. Cure potatoes in storage at 60
degrees F before lowering temperature. Provide adequate
ventilation.
Pesticide
mancozeb products (mancozeb) | Seed treatment; dip whole
or cut potatoes in solution. Several formulations of mancozeb
(Dithane, Manzate, Penncozeb) are labeled at various rates.
See label for directions. REI: 24-hour. PHI: 3-day in
Michigan and Ohio; 14-day in all other states. FRAC M03.
Maxim 4FS (fludioxonil) | 0.08 fl. oz. per 100 lbs. of seed.
Seed treatment. Use specific application equipment according
to label. REI: 12-hour. FRAC 12.
Maxim MZ (mancozeb, fludioxonil) | 0.5 lbs. per 100 lbs.
of seed. Seed treatment. REI: 24-hour. FRAC M03, FRAC
12.
Mertect 340-F (SC) (thiabendazole) | 0.42 oz. per 2,000 lbs.
of tubers. 0.42 fl. oz. per 2,000 lbs. of tubers. Do not treat
seed potatoes after cutting. Fungicide resistance known REI:
12-hour. FRAC 01.
Seed treatments for diseases (mefenoxam, fludioxonil,
azoxystrobin, thiabendazole, difenoconazole,
prothioconazole, sedaxane, penflufen) | Rates vary by
product. Select seed treatments Cruiser Maxx Vibrance
Potato (thiamethoxam, difenconazole, sedaxane, fludioxonil);
Cruiser Maxx Potato Extreme (thiamethoxam,
difenoconazole, fludioxonil); Emesto Silver (penflufen,
prothioconazole). FRAC 04, FRAC 12, FRAC 11, FRAC 01,
FRAC 03, FRAC 07.
Stadium (FSC) (azoxystrobin, difenoconazole, fludioxonil)
| 1 fl. oz. per 2,000 lbs. of tubers. Postharvest application
only; no more than one application to tubers. FRAC 11,
FRAC 03, FRAC 12.
Early Blight of Potatoes - Alternaria
Fungus
This disease initially causes lesions on lower leaves of the
potato plant. After field planting, begin protective fungicide
applications on a 7-14 day schedule.
Group 11 Resistance: Strains of the fungus that causes early
blight that are resistant to group 11 fungicides have been
observed in Indiana and Ohio. Group 11 products labeled for
potato and early blight include Cabrio and Quadris. Tank-mix
group 11 fungicides with products that have a different mode
Midwest Veg Guide 2022
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Midwest Vegetable Guide - 2022

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