Cauliflower Mosaic Virus of Brassicas

CMV

Description:

Mottling or mosaic of the leaf.
Veins clear on the young leaves then form light collared bands along the veins.
Stunting and distortion of the plant and premature flowering.

Species Affected:

Cauliflower very susceptible.
Canola.
Occurs on many Brassica species.

Biology:

Warm dry conditions favour the aphids that spread the disease.
Survives in crop residues and on Brassica weeds.
Spread by aphids such as the Green Peach Aphid, Cabbage Aphid, Turnip Aphid and many others.

Life Cycle:

Transmitted by Aphids usually early in the season.

Origin and History:

Distribution:

Significance:

Yields of Canola may be reduced when the crop is infected early and levels of infection are high.

Management and Control:

Remove crop residues.
Control Brassica weeds and other hosts in the crop and adjacent areas.
Adjust planting date so young crops aren't exposed to periods of high aphid numbers.
Apply anti-feeding aphicides before aphid numbers build up.
Avoid continuous cropping of Brassicas.
Remove infected seedlings and plants.

Related and Similar Species:

Beet Western Yellows Virus
Turnip Mosaic Virus

References:

Acknowledgments:

Collated by HerbiGuide. Phone 08 98444064 or www.HerbiGuide.com.au for more information.