Photo Gallery of Vegetable Problems
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Crucifer Disease Guide - A Practical Guide for Seedsmen, Growers and Agricultural Advisors. Published by Seminis Vegetable Seeds, Inc.’s Plant Health Department and Seed Health Departments.
Small-Scale Cost-Effective Hot Water Seed Treatment
Reduce the risk of seed-borne diseases, especially for organic Brassica growers.
Disease: Black Leg
Pathogens: Phoma lingam (sexual stage = Leptosphaeria maculans)
Host crops:Most members of the Brassicaceae (Cruciferae) = cabbage family, including broccoli, Brussels sprouts, cabbage, canola, cauliflower, various Chinese brassica vegetables, collard, kale, mizuna, mustard, oilseed rape, oilseed turnip rape, rutabaga, turnip, etc.), Sinapis (white and yellow mustard), and Raphanus (daikon and radish). Several wild species exist that may be infected by P. lingam including Descurainia (tansymustard), Sisymbrium (hedge mustard), and Thlaspi (penny-cress). This is a quarantine disease in five counties in northwestern WA because of the risk of this pathogen to the brassica vegetable seed industry.
Black Leg, Light Leaf Spot, and White Leaf Spot, Cynthia Ocamb, PhD., Plant Pathologist, OSU Extension, Associate Professor--Botany & Plant Pathology.
Fungicides for Control of Black Leg, David Priebe, Pesticides Program, Oregon Department of Agriculture.
Addressing Blackleg in the Willamette Valley: Oregon Department of Agriculture permanent ruling released on black leg of brassicaceae in January 2015 – see the Brassica Production Districts document, and the OSDA Permanent Ruling document titled ‘Crucifer blackleg disease requirements moved into one regulation; removes same requirements from rapeseed production districts,’ below.
- Oregon Secretary of State Certificate and Order for Filing - PERMANENT ADMINISTRATIVE RULES: Crucifer blackleg disease requirements moved into one regulation; removes same requirements from rapeseed production districts.
- Brassicaceae Production Districts and Rapeseed Control Areas (603-052-0860), Oregon Department of Agriculture.
Management of Black Leg in Oregon on Brassica seed crops, a Clinic Close-up, Oregon State University Extension Service.
Management of Black Leg in Oregon on Vegetable Brassica Crops and Seed Crops, a Clinic Close-up, Oregon State University Extension Service.
|Below-ground symptoms of clubroot.|
|Photo Source: Lindsey du Toit|
Clubroot of Crucifers. Vegetable MD Online.
Clubroot of vegetable brassicas – towards integrated control. New Zealand Institute for Crop & Food Research Ltd.
Clubroot of Crucifers. The Ohio State University Extension.
Managing Clubroot: Equipment Sanitation Guide. Canola Council of Canada
Top 10 tips from the 2013 International Clubroot Workshop. Canola Watch, Canola Council of Canada.
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