Midwest Vegetable Guide - 2022 - 104

Cole Crops and Brassica Leafy Greens - Diseases
with 1 to 2 whorls of leaves to protect the head. Cauliflower
varieties range in maturity from 55 to 100 days.
Greens (collards, kale, mustards): Greens are ready to
harvest when the leaves reach the size that your markets
desire. Leaves are grabbed by the handful and cut with knives
or plucked by hand by snapping handfuls of leaf stalks
downwards, and then quickly bunching them with rubber
bands that are preloaded on the picker's wrists. Specialized
greens harvesters can be used for baby-leaf greens. From seed
to harvest ranges from 30 to 75 days.
Kohlrabi: Harvest when its diameter reaches 1-1/2 to 2
inches for best quality. Larger sizes may be tough and
stringy. Kohlrabi varieties range in maturity between 45 to 60
days.
Cole Crops and Brassica
Leafy Greens - Diseases
Reviewed by Dan Egel - Sept 2021
Recommended Controls
Black Leg of Brassicas - Phoma Fungus
Black leg is an important disease of broccoli, Brussel sprouts,
cauliflower and turnip. May be seedborne.
Non-Pesticide
Broccoli, Brussels sprouts, Cabbage, Cauliflower, Collards,
Kale, Kohlrabi, Mustard Greens, Turnip Greens | Use
disease-free seed and transplants. Hot water seed treatment
may help to reduce this seedborne pathogen. Use
temperatures and times of 122 for 25 minutes for Brussels
sprouts and cabbage, 122 for 15 minutes for mustard greens,
and 122 for 20 minutes for other Brassicas. Since oilseed rape
is particularly susceptible to black leg, avoid planting crucifer
crops close to oilseed rape. Leave 1/4-mile buffer from
previously infected fields, delay plant until conditions are
dry. Rotate to a non-Brassica crop for 3-5 years. Prompt
destruction of the finished crop with tillage to rapidly
breakdown tissue is an important method to prevent disease
build-up.
Pesticide
iprodione products (iprodione) Broccoli | 2 pts. per acre.
Formulations of iprodione include Nevado and Rovral. REI:
24-hour. PHI: 0-day. FRAC 02.
Priaxor (fluxapyroxad, pyraclostrobin) Broccoli, Cabbage,
Cauliflower, Collards, Kale, Mustard Greens | 6-8 fl. oz. per
acre. REI: 12-hour. PHI: 3-day. FRAC 07, FRAC 11.
Black Rot of Brassicas - Xanthomonas
Bacteria
Black rot is an important bacterial disease of cole crops. May
be seedborne.
Non-Pesticide
Broccoli, Brussels sprouts, Cabbage, Cauliflower, Collards,
Kale, Kohlrabi, Mustard Greens, Turnip Greens | Use
disease-free seed and transplants. Hot water seed treatment
may help to reduce this seedborne pathogen. Use
temperatures and times of 122 for 25 minutes for Brussels
sprouts and cabbage, 122 for 15 minutes for mustard greens,
and 122 for 20 minutes for other Brassicas. Rotate to a nonBrassica
crop for 2-3 years. Prompt destruction of the
finished crop with tillage to rapidly breakdown tissue is an
important method to prevent disease build-up.
Pesticide
Actigard (0.5WDG) (acibenzolar-s-methyl) Broccoli,
Brussels sprouts, Cabbage, Cauliflower, Collards, Kale,
Kohlrabi, Mustard Greens, Turnip Greens | 0.5-1.0 oz. per
acre. Suppression only. Do not apply to stressed plants. REI:
12-hour. PHI: 7-day. FRAC P01.
copper products (copper hydroxide, copper octanoate,
copper oxychloride, copper sulfate, copper diammonium
diacetate complex, cuprous oxide) Broccoli, Brussels
sprouts, Cabbage, Cauliflower, Collards, Kale, Kohlrabi,
Mustard Greens, Turnip Greens | Several formulations of
copper (Badge, Champ, Kocide) are labelled for use and may
slow the spread of black rot. See label for directions. REI: 4
to 48-hour. PHI: 0-day. FRAC M01. OMRI-listed.
Bottom Rot of Cabbage - Rhizoctonia
Fungus
Bottom rot of cabbage is cause by Rhizoctonia species, and
can form a complex with black leg stem canker pathogen.
Non-Pesticide
Broccoli, Brussels sprouts, Cabbage, Cauliflower, Collards,
Kale, Kohlrabi, Mustard Greens, Turnip Greens | Clean and
sanitize transplant trays, benches, and tools. Rogue infected
transplants. Avoid working field under wet conditions.
Prompt destruction of the finished crop with tillage to rapidly
breakdown tissue is an important method to prevent disease
build-up.
104
Midwest Veg Guide 2022
Midwest Vegetable Guide - 2022

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