Broad disease constraint resources are outlined in the Agronomists Toolkit. Specific disease categories are listed below:

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Clubroot

Constraint - Clubroot

Description

  • Clubroot is caused by the soil-borne fungus Plasmodiophora brassicae

  • Most Australian pathotypes of clubroot are only able to cause disease in the warmer months and require irrigation water for dispersal, with the exception of Tasmania and some parts of New South Wales where disease is observed year round

Symptoms

  • Infection can occur at any stage of growth and is restricted to the roots

  • Swollen, galled roots are the most typical symptom of infected plants

  • Galls are at first firm and white, but become soft and greyish brown as they mature

  • Affected roots have an impaired ability to transport water and nutrients

Damage

  • Yield penalty from stunting and mositure stress can be severe

Management

Implementation of a 5 year rotation so that infested fields are kept free of susceptible crops and weeds for at least 5 years to allow spore decay, as well as thoroughly cleaning equipment can assist in the management of clubroot. Applying lime to increase soil pH  to 7.0-7.5 has been successful for vegetable brassicas but would be cost prohibitive in most oilseed brassica areas.

Links and Resources

DAFWA - Diagnosing clubroot in canola

Introduction, what to look for in paddock and plant, what else could it be, where did it come from, and management strategies. Page last updated 2014.

DEPI VIC - Canola diseases. Clubroot

The section on clubroot contains introduction, symptoms, disease cycle, and management. Published in 2008, page last updated 2009, reviewed 2010.

DEPI VIC - Identification and management of field crop diseases in Victoria. Clubroot

Page 146. Table 11.1 gives a key for canola diseases at different stages of plant growth. Page 157 contains information on introduction, symptoms,  disease cycle, and management. Published 2012.

DPI NSW - Primefact Clubroot of Canola and Mustard

2 page PDF. Background, symptoms, disease cycle, and management. Published 2005.

GRDC - Best Practice Management Guide. Clubroot

Page 63. Introduction, symptoms, disease cycle, and management. Published 2009.