Cauliflower Mosiac Virus

Constraint - Cauliflower Mosaic Virus

Cauliflower mosaic virus (CaMV) is one of three viruses that infect Australian canola. Beet western yellows virus (BWYV) and Turnip mosaic virus (TuMV) are the others.

Symptoms

• Older leaves have pale ring-spots or are mildly mottled with pale veins

• Plants infected before stem elongation can be stunted, with few flowers or seeds

• Symptoms appear in autumn, with early sown crops showing highest infection

Damage

• Plants affected as seedlings show greatest yield loss

• Percentage of actual yield loss is often very hard to determine

Management

Control of brassicaceous weeds and volunteer canola (especially over summer), retaining stubble at sowing, manipulating sowing dates, and sowing at high seeding rates can all be effective managment strategies for reducing the impact of Cauliflower mosaic virus.

Links and Resources

DAFWA - Diagnosing cauliflower mosaic virus in canola Diagnosis, what to look for in paddock and plant, where did it come from, and management strategies. Page last updated 2014.

DEPI VIC - Canola diseases. Cauliflower mosaic virus The section on viruses contains information on introduction, symptoms, disease cycle, and management. Published 2008, updated 2009, reviewed 2010.

DEPI VIC - Identification and management of field crop diseases in Victoria.Cauliflower mosaic virus Page 146 Table 11.1 gives a key for canola diseases at different stages of plant growth. Page 154 contains introduction, symptoms, disease cycle, and management. Published 2012.

DPI NSW - Virus diseases in Canola and Mustard. Cauliflower mosaic virus 6 page PDF. Introduction, distribution, virus species and their transmission, symptoms, incidence, spread, aphid identification, control measures, and current research. Published 2004.

GRDC - Best Practice Management Guide. Cauliflower mosaic virus Page 65. Introduction on all three viruses, symptoms, disease cycle, and management. Published 2009.