Midwest Vegetable Guide - 2022 - 234

Potato - Diseases
Vine Kill Herbicides
Defol 5 (5L) (sodium chlorate) 4.8 qts. per acre with 10-20
gals. per acre water by ground or 5-10 gals. per acre water by
air. Apply 10 days before harvest. Do not apply in extreme
heat during the middle of the day. REI: 12-hour. HRAC NC.
paraquat formulations (paraquat) 0.8-1.5 pts. per acre of
2.5L or 0.6-1.3 pt. per acre of 3L in 50-100 gals. of water
plus 1 gal. COC or 1-2 pts. nonionic surfactant per 100 gals.
spray solution. Not for potatoes to be stored or used for
seed. Begin applications when leaves begin to turn yellow.
Immature potato foliage and drought-stressed potato foliage
are tolerant to this product. Maximum 3 pts. of 2.5L or 2.6
pts. of 3L per acre per season. For split applications, use
lower rate and wait 5 days between applications. Read label
for complete instructions. 3L formulation not for use in Iowa
or Missouri. REI: 24-hour. PHI: 3-day. HRAC 22. RUP.
Reglone (2L) (diquat) 1-2 pts. per acre in 20-100 gals. water
plus 8-64 fl. oz. nonionic surfactant. A second application can
be made if necessary. Allow at least 5 days between
applications. REI: 24-hour. PHI: 7-day. HRAC 22.
Rely 280 (2.34L) (glufosinate) 21 fl. oz. per acre. Not for
potatoes to be used for seed. Do not make more than 1
application. REI: 12-hour. PHI: 9-day. HRAC 10.
Scythe (4.2L) (pelargonic acid) 5% to 10% solution in 75 to
200 gals. spray solution per acre. REI: 12-hour. PHI: 24-hour.
HRAC NC.
Potato - Diseases
Reviewed by Dan Egel - Sept 2021
Recommended Controls
Aster Yellows (Purple-Top Wilt) of
Multiple Crops - Phytoplasma Mollicutes
This pathogen is transmitted by leafhoppers. Infection rates
can jump when adjacent crops are harvested mid-season, such
as alfalfa or wheat.
Non-Pesticide
Plant only certified seed tubers. Practice clean cultivation.
Rogue first infected plants, including tubers.
Pesticide
Insecticides | Use an insecticide to control leafhoppers that
transmit the disease. Leafhoppers must be controlled before
they feed. See Insect section.
234
Black Dot of Potatoes - Colletotrichum
Fungus
Pesticide
azoxystrobin products (azoxystrobin) | Use 2 lb. a.i. per
gallon formulations (Quadris) at 6.0-20.0 fl. oz. per acre. Use
3.3 lb. per gallon formulations (Azteroid) at 3.9-12.8 fl. oz.
per acre. REI: 4-hour. PHI: 14-day. FRAC 11.
chlorothalonil products (chlorothalonil) | Michigan only -Bravo
Weather Stik (exp. 12/31/2024), Bravo ZN (exp.
12/31/2025), Echo 720 (exp. 12/31/2024), and Echo 90DF
(exp. 12/31/2024) can apply up to 16 lbs. a.i. per acre per
year. All other states do not exceed 11.25 lbs. a.i. per acre per
year. Several formulations of chlorothalonil (Bravo, Echo,
Equus) are labeled at various rates. See product labels. REI:
12-hour. PHI: 7-day. FRAC M05.
Headline (SC) (2.08) (pyraclostrobin) | 6-9 fl. oz. per acre.
REI: 12-hour. PHI: 3-day. FRAC 11.
Luna Tranquility (SC) (fluopyram, pyrimethanil) | 8-11.2
fl. oz. per acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC
09.
Miravis Prime (SC) (pydiflumetofen, fludioxonil) | 9.211.4
fl. oz. per acre. Black dot suppression only. REI: 12hour.
PHI: 14-day. FRAC 07, FRAC 12.
Quadris Opti (SC) (azoxystrobin, chlorothalonil) | 1.6 pts.
per acre. REI: 12-hour. PHI: 14-day. FRAC 11, FRAC M05.
Revus Top (SC) (mandipropamid, difenoconazole) | 5.57.0
fl. oz. per acre. REI: 12-hour. PHI: 14-day. FRAC 40,
FRAC 03.
Tanos (DF) (famoxadone, cymoxanil) | 6-8 oz. per acre.
Black dot Disease suppression only. REI: 12-hour. PHI: 14day.
FRAC 11, FRAC 27.
Zing! (zoxamide, chlorothalonil) | 24-34 fl. oz. per acre.
REI: 12-hour. PHI: 7-day. FRAC 22, FRAC M05.
Black Leg of Potatoes - Pectobacterium
or Dickeya Bacteria
Non-Pesticide
Use seed pieces certified to be free of disease. Plant in welldrained
soil and avoid over-irrigation. Sanitize equipment at
planting and at harvest to limit spread.
Midwest Veg Guide 2022
Midwest Vegetable Guide - 2022

Table of Contents for the Digital Edition of Midwest Vegetable Guide - 2022
