Midwest Vegetable Guide - 2022 - 184

Leafy Vegetables and Herbs (Non-Brassica) - Diseases
(sold as MTO). Greenhouse sanitation and good weed control
of Aster weeds like dandelion, groundsel, and thistles is
important to limit other hosts near the crop. Use a monitoring
program to time the release of natural enemies of aphids (see
insect section). Keep new lettuce plantings as far as possible
with the previous production area. Remove infected
transplants and do not plant them out into fields. Prompt
destruction of the finished crop with tillage to rapidly
breakdown tissue is an important method to prevent disease
build-up.
Pesticide
Insecticides Chicory, Endive, Escarole, Head Lettuce, Leaf
Lettuce, Radicchio | For LMV: use aphid-specific
insecticides to lower the population without also reducing the
population of natural enemies. See insect 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 in greenhouses and high tunnels
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 lettuce, the pathogen infects the root crown
and heart of the plant, which makes the leaves drop and rot.
Inspection of the stems, or lettuce hearts, will reveal small
black pellets that are the overwintering body of the pathogen.
Non-Pesticide
Arugula, Basil, Chicory, Chive, Cilantro, Coriander, Cress,
Dill, Endive, Escarole, Fennel, Florence Fennel, Head
Lettuce, Lavender, Leaf Lettuce, Marjoram, Oregano,
Parsley, Radicchio, Rosemary, Sage, Savory, Spinach, Swiss
Chard, Tarragon, Thyme | Avoid fields with a history of the
problem. Rotate to a non-broadleaf crop, such as grass grains
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
Botran 75W (dichloro-nitroaniline) Endive, Head Lettuce,
Leaf Lettuce | Rate depends on crop and application method.
184
Switch 62.5WG (cyprodinil, fludioxonil) Arugula, Basil,
Chicory, Chive, Cilantro, Coriander, Cress, Dill, Endive,
Escarole, Fennel, Florence Fennel, Head Lettuce, Lavender,
Leaf Lettuce, Marjoram, Oregano, Parsley, Radicchio,
Rosemary, Sage, Savory, Spinach, Swiss Chard, Tarragon,
Thyme | 11-14 oz. per acre. Powdery mildew suppression
only. REI: 12-hour. PHI: 0-day. FRAC 09, FRAC 12.
White Rust of Multiple Crops - Albugo
Oomycete
Non-Pesticide
Arugula, Cress, Spinach | Use disease-free seed and
transplants. Hot water seed treatment may reduce this
seedborne disease. Use temperatures and times of 122 F for
25 minutes for spinach. Rotate to non-host crops for 3 years.
Varieties with partial resistance are available. Use raised beds
Midwest Veg Guide 2022
Fontelis (1.67SC) (penthiopyrad) Basil, Chicory, Chive,
Cilantro, Coriander, Cress, Dill, Endive, Escarole, Fennel,
Florence Fennel, Head Lettuce, Lavender, Leaf Lettuce,
Marjoram, Oregano, Parsley, Radicchio, Rosemary, Sage,
Savory, Spinach, Swiss Chard, Tarragon, Thyme | 14-24 fl.
oz. per acre. REI: 12-hour. PHI: 3-day. FRAC 07.
iprodione products (iprodione) Head Lettuce, Leaf Lettuce |
1.5-2 pts. per acre. Formulations of iprodione include Nevado
and Rovral. REI: 24-hour. PHI: 14-day. FRAC 02.
Kenja 400SC (3.33) (isofetamid) Head Lettuce, Leaf Lettuce
| 12.3 fl. oz. per acre. REI: 12-hour. PHI: 14-day. FRAC 07.
Luna Sensation (fluopyram, trifloxystrobin) Arugula,
Chicory, Cress, Endive, Escarole, Head Lettuce, Leaf
Lettuce, Parsley, Radicchio, Spinach | 7.6 fl. oz. per acre. Can
be applied as a band over lettuce. REI: 12-hour. PHI: 0-day.
FRAC 07, FRAC 11.
Merivon (fluxapyroxad, pyraclostrobin) Arugula, Basil,
Chicory, Chive, Cilantro, Coriander, Cress, Dill, Endive,
Escarole, Fennel, Florence Fennel, Head Lettuce, Lavender,
Leaf Lettuce, Marjoram, Oregano, Parsley, Radicchio,
Rosemary, Sage, Savory, Spinach, Swiss Chard, Tarragon,
Thyme | 8-11 fl. oz. per acre. Suppression only. REI: 12-hour.
PHI: 1-day. FRAC 07, FRAC 11.
Flowable formulations may be available. REI: 12-hour. PHI:
14-day. FRAC 14.
Contans WG (5) (Coniothyrium minitans strain
CON/M/91-08) Head Lettuce, Leaf Lettuce | 1-6 lbs. per
acre. Apply immediately after harvest or 3-4 months before
planting. REI: 4-hour. FRAC NC. OMRI-listed.
Endura (WG) (boscalid) Head Lettuce, Leaf Lettuce | 8-11
oz. per acre. Suppresses Bottom Rot. REI: 12-hour. PHI: 14day.
FRAC 07.
Midwest Vegetable Guide - 2022

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