Midwest Vegetable Guide - 2022 - 261

Root Crops - Diseases
Vydate L (2WSL) (oxamyl) Carrot | 1-2 gal. per acre. Apply
as a banded or shank-injected pre-plant, at-plant in-furrow or
directed post-plant soil treatment with at least 20 gals. water
per acre incorporated 2-4 inches deep by water or mechanical
means, or overhead chemigate before crop emergence to
deliver in 0.5 inch of irrigation water. Allow 14 days between
applications. IA, IL, KS, MN, and MO use low rate only and
do not exceed 4 applications or 2.5 gals. per acre per season.
IN, MI, OH use high rate and do not exceed 8 applications or
8 gals. per acre per season. REI: 48-hour. PHI: 14-day. IRAC
01A. RUP.
Viruses of Multiple Crops - Multiple
Pathogens
Turnip Mosaic Virus is transmitted by multiple species of
aphids. In horseradish the pathogen can increase with each
growing season as root clones are propagated.
Non-Pesticide
Horseradish | For TuMV: start new plantings with virus-free
root stocks generated from tissue-culture.
Pesticide
Insecticides Horseradish | For TuMV: maintain an aphid
management program. See Insects section. For Brittle Root:
maintain a leafhopper management program. See Insects
section.
White Mold (Timber Rot, Drop, Stem
Rot) of Multiple Crops - Sclerotinia
Fungus
This soil pathogen is long-lived in the soil, and has a wide
host range on broadleaved crops and weeds, including beans,
vine crops, lettuce, tomatoes, peppers, and cole crops. It goes
by other names in other crops, such as Drop, White Mold,
Stem Rot, and Timber Rot.
It is more commonly found where humidity and temperatures
are high. The fungus often infects flowers, which then drop
off and infect the stems that they land on. The stems take on a
woody appearance and can split open. On root crops, the
pathogen infects the root crown and stem, which makes the
leaves drop and rot. Inspection of the stems will reveal small
black pellets that are the overwintering body of the pathogen.
Non-Pesticide
Beet, Carrot, Celeriac, Horseradish, Parsnip, Radish,
Rutabaga, Turnip | Avoid fields with a history of the
problem. Rotate to a non-broadleaf crop, such as grass grains
Ridomil Gold Copper (WSB) (mefenoxam, copper
hydroxide) Radish | Use as a foliar spray. REI: 48-hour. PHI:
7-day. FRAC 04, FRAC M01.
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261
or sweet corn for >6 years. Prompt destruction of the finished
crop with tillage to rapidly breakdown tissue is an important
method to prevent disease build-up. Anaerobic soil
disinfestation (ASD) is an effective sterilization method for
greenhouse and high tunnel soils that contain this pathogen.
Pesticide
Endura (WG) (boscalid) Beet, Carrot, Celeriac,
Horseradish, Parsnip, Radish, Rutabaga, Turnip | 7.8 oz. per
acre. REI: 12-hour. PHI: 0-day. FRAC 07.
Fontelis (1.67SC) (penthiopyrad) Beet, Carrot, Celeriac,
Horseradish, Parsnip, Radish, Rutabaga, Turnip | 16-30 fl.
oz. per acre. REI: 12-hour. PHI: 0-day. FRAC 07.
Luna Sensation (fluopyram, trifloxystrobin) Beet, Carrot,
Celeriac, Horseradish, Parsnip, Radish, Rutabaga, Turnip |
7.6 fl. oz. per acre. High rate only allowed on carrots. REI:
12-hour. PHI: 7-day. FRAC 07, FRAC 11.
Luna Tranquility (SC) (fluopyram, pyrimethanil) Beet,
Carrot, Celeriac, Horseradish, Parsnip, Radish, Rutabaga,
Turnip | 11.2 fl. oz. per acre. REI: 12-hour. PHI: 7-day.
FRAC 07, FRAC 09.
Omega 500F (4.17) (fluazinam) Carrot | 1 pt. per acre. REI:
12-hour. PHI: 7-day. FRAC 29.
White Rust of Multiple Crops - Albugo
Oomycete
Non-Pesticide
Horseradish, Radish, Rutabaga, Turnip | Use disease-free
seed and transplants. Hot water seed treatment may reduce
this seedborne disease. Use temperatures and times of 122 F
for 20 minutes for rutabaga and turnip, 122 F for 15 minutes
for radish. Rotate to non-host crops for 2 years. Varieties with
partial resistance are available. Brassica weeds like
shepherd's purse, yellow rocket, and wild mustard can host
the pathogen and should be managed. Prompt destruction of
the finished crop with tillage to rapidly breakdown tissue is
an important method to prevent disease build-up.
Pesticide
Cabrio EG (20) (pyraclostrobin) Horseradish, Radish,
Rutabaga, Turnip | 8-16 oz. per acre. REI: 12-hour. PHI: 0day.
FRAC 11.
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