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2022 Midwest Vegetable Guide

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Cole Crops and Brassica Leafy Greens – Diseases 104 Midwest Veg Guide 2022 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 non- Brassica 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.

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